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Date:   Tue, 5 Oct 2021 09:15:41 -0700
From:   Daniel Latypov <dlatypov@...gle.com>
To:     brendanhiggins@...gle.com, davidgow@...gle.com
Cc:     linux-kernel@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kselftest@...r.kernel.org, skhan@...uxfoundation.org,
        Rae Moar <rmoar@...gle.com>
Subject: Re: [PATCH v4] kunit: tool: improve compatibility of kunit_parser
 with KTAP specification

On Mon, Oct 4, 2021 at 10:21 AM Daniel Latypov <dlatypov@...gle.com> wrote:
>
> From: Rae Moar <rmoar@...gle.com>
>
> Update to kunit_parser to improve compatibility with KTAP
> specification including arbitrarily nested tests. Patch accomplishes
> three major changes:
>
> - Use a general Test object to represent all tests rather than TestCase
> and TestSuite objects. This allows for easier implementation of arbitrary
> levels of nested tests and promotes the idea that both test suites and test
> cases are tests.
>
> - Print errors incrementally rather than all at once after the
> parsing finishes to maximize information given to the user in the
> case of the parser given invalid input and to increase the helpfulness
> of the timestamps given during printing. Note that kunit.py parse does
> not print incrementally yet. However, this fix brings us closer to
> this feature.
>
> - Increase compatibility for different formats of input. Arbitrary levels
> of nested tests supported. Also, test cases and test suites are now
> supported to be present on the same level of testing.
>
> This patch now implements the KTAP specification as described here:
> https://lore.kernel.org/linux-kselftest/CA+GJov6tdjvY9x12JsJT14qn6c7NViJxqaJk+r-K1YJzPggFDQ@mail.gmail.com/.
>
> This patch adjusts the kunit_tool_test.py file to check for
> the correct outputs from the new parser and adds a new test to check
> the parsing for a KTAP result log with correct format for multiple nested
> subtests (test_is_test_passed-all_passed_nested.log).
>
> This patch also alters the kunit_json.py file to allow for arbitrarily
> nested tests.
>
> Signed-off-by: Rae Moar <rmoar@...gle.com>
> Reviewed-by: Brendan Higgins <brendanhiggins@...gle.com>
> Signed-off-by: Daniel Latypov <dlatypov@...gle.com>
>
> ---
> NOTE: this patch is now applied on top of
> https://lore.kernel.org/linux-kselftest/20210930222048.1692635-5-dlatypov@google.com/
> to resolve a conflict.
>
>
> Change log from v3:
> https://lore.kernel.org/linux-kselftest/20210901190623.315736-1-rmoar@google.com/
> - Resolve conflict with hermetic testing patches
> - Fix pytype error (str -> Optional[str] in kunit_json.py)
>
> Change log from v2:

Please ignore this patch.
I seem to have accidentally applied v2 so this patch is missing the
changes Rae added in v3.

--raw_output is also broken right now, since I didn't update it enough
to resolve the conflicts with the hermetic testing patches.

I'll send a v4 when I get that sorted out.

> https://lore.kernel.org/linux-kselftest/20210826195505.3066755-1-rmoar@google.com/
> - Fixes bug of type disagreement in kunit_json.py for build_dir
> - Removes raw_output()
> - Changes docstrings in kunit_parser.py (class docstring, LineStream
>   docstrings, add_error(), total(), get_status(), all parsing methods)
> - Fixes bug of not printing diagnostic log in the case of end of lines
> - Sets default status of all tests to TEST_CRASHED
> - Adds and prints empty tests with crashed status in case of missing
>   tests
> - Prints 'subtest' in instance of 1 subtest instead of 'subtests'
> - Includes checking for 'BUG:' message in search of crash messages in
>   log (note that parse_crash_in_log method could be removed but would
>   require deleting tests in kunit_tool_test.py that include the crash
>   message that is no longer used. If removed, parser would still print
>   log in cases of test crashed or failure, which would now include
>   missing subtests)
> - Fixes bug of including directives (other than SKIP) in test name
>   when matching name in result line for subtests
>
>
> Change log from v1:
> https://lore.kernel.org/linux-kselftest/20210820200032.2178134-1-rmoar@google.com/
> - Rebase onto kselftest/kunit branch
> - Add tests to kunit_tool_test.py to check parser is correctly stripping
>   hyphen, producing correct json objects with nested tests, correctly
>   passing kselftest TAP output, and correctly deals with missing test plan.
> - Fix bug to correctly match test name in instance of a missing test plan.
> - Fix bug in kunit_tool_test.py pointed out by Daniel where it was not
>   correctly checking for a proper match to the '0 tests run!' error
>   message. Reverts changes back to original.
> - A few minor changes to commit message using Daniel's comments.
> - Change docstrings using Daniel's comments to reduce:
>   - Shortens some docstrings to be one-line or just description if it is
>     self explanatory.
>   - Remove explicit respecification of types of parameters and returns
>     because this is already specified in the function annoations. However,
>     some descriptions of the parameters and returns remain and some contain
>     the type for context. Additionally, the types of public attributes of
>     classes remain.
>   - Remove any documentation of 'Return: None'
>   - Remove docstrings of helper methods within other methods
> ---
>  tools/testing/kunit/kunit.py                  |    6 +-
>  tools/testing/kunit/kunit_json.py             |   55 +-
>  tools/testing/kunit/kunit_parser.py           | 1056 ++++++++++++-----
>  tools/testing/kunit/kunit_tool_test.py        |  134 ++-
>  .../test_is_test_passed-all_passed_nested.log |   34 +
>  .../test_is_test_passed-kselftest.log         |   14 +
>  .../test_is_test_passed-missing_plan.log      |   31 +
>  .../kunit/test_data/test_strip_hyphen.log     |   16 +
>  8 files changed, 954 insertions(+), 392 deletions(-)
>  create mode 100644 tools/testing/kunit/test_data/test_is_test_passed-all_passed_nested.log
>  create mode 100644 tools/testing/kunit/test_data/test_is_test_passed-kselftest.log
>  create mode 100644 tools/testing/kunit/test_data/test_is_test_passed-missing_plan.log
>  create mode 100644 tools/testing/kunit/test_data/test_strip_hyphen.log
>
> diff --git a/tools/testing/kunit/kunit.py b/tools/testing/kunit/kunit.py
> index 8c7e8c7b2c97..9e2a96e45e3b 100755
> --- a/tools/testing/kunit/kunit.py
> +++ b/tools/testing/kunit/kunit.py
> @@ -136,7 +136,7 @@ def exec_tests(linux: kunit_kernel.LinuxSourceTree, request: KunitExecRequest,
>                                 test_glob = request.filter_glob.split('.', maxsplit=2)[1]
>                                 filter_globs = [g + '.'+ test_glob for g in filter_globs]
>
> -       overall_status = kunit_parser.TestStatus.SUCCESS
> +       test_counts = kunit_parser.TestCounts()
>         exec_time = 0.0
>         for i, filter_glob in enumerate(filter_globs):
>                 kunit_parser.print_with_timestamp('Starting KUnit Kernel ({}/{})...'.format(i+1, len(filter_globs)))
> @@ -155,9 +155,9 @@ def exec_tests(linux: kunit_kernel.LinuxSourceTree, request: KunitExecRequest,
>                 test_end = time.time()
>                 exec_time += test_end - test_start
>
> -               overall_status = kunit_parser.max_status(overall_status, result.status)
> +               test_counts.add_subtest_counts(result.result.test.counts)
>
> -       return KunitResult(status=result.status, result=result.result, elapsed_time=exec_time)
> +       return KunitResult(status=test_counts.get_status(), result=result.result, elapsed_time=exec_time)
>
>  def parse_tests(request: KunitParseRequest, input_data: Iterable[str]) -> KunitResult:
>         parse_start = time.time()
> diff --git a/tools/testing/kunit/kunit_json.py b/tools/testing/kunit/kunit_json.py
> index f5cca5c38cac..d01581d068ac 100644
> --- a/tools/testing/kunit/kunit_json.py
> +++ b/tools/testing/kunit/kunit_json.py
> @@ -11,47 +11,46 @@ import os
>
>  import kunit_parser
>
> -from kunit_parser import TestStatus
> -
> -def get_json_result(test_result, def_config, build_dir, json_path) -> str:
> -       sub_groups = []
> -
> -       # Each test suite is mapped to a KernelCI sub_group
> -       for test_suite in test_result.suites:
> -               sub_group = {
> -                       "name": test_suite.name,
> -                       "arch": "UM",
> -                       "defconfig": def_config,
> -                       "build_environment": build_dir,
> -                       "test_cases": [],
> -                       "lab_name": None,
> -                       "kernel": None,
> -                       "job": None,
> -                       "git_branch": "kselftest",
> -               }
> -               test_cases = []
> -               # TODO: Add attachments attribute in test_case with detailed
> -               #  failure message, see https://api.kernelci.org/schema-test-case.html#get
> -               for case in test_suite.cases:
> -                       test_case = {"name": case.name, "status": "FAIL"}
> -                       if case.status == TestStatus.SUCCESS:
> +from kunit_parser import Test, TestResult, TestStatus
> +from typing import Any, Dict, Optional
> +
> +JsonObj = Dict[str, Any]
> +
> +def _get_group_json(test: Test, def_config: str, build_dir: Optional[str]) -> JsonObj:
> +       sub_groups = []  # List[JsonObj]
> +       test_cases = []  # List[JsonObj]
> +
> +       for subtest in test.subtests:
> +               if len(subtest.subtests):
> +                       sub_group = _get_group_json(subtest, def_config,
> +                               build_dir)
> +                       sub_groups.append(sub_group)
> +               else:
> +                       test_case = {"name": subtest.name, "status": "FAIL"}
> +                       if subtest.status == TestStatus.SUCCESS:
>                                 test_case["status"] = "PASS"
> -                       elif case.status == TestStatus.TEST_CRASHED:
> +                       elif subtest.status == TestStatus.TEST_CRASHED:
>                                 test_case["status"] = "ERROR"
>                         test_cases.append(test_case)
> -               sub_group["test_cases"] = test_cases
> -               sub_groups.append(sub_group)
> +
>         test_group = {
> -               "name": "KUnit Test Group",
> +               "name": test.name,
>                 "arch": "UM",
>                 "defconfig": def_config,
>                 "build_environment": build_dir,
>                 "sub_groups": sub_groups,
> +               "test_cases": test_cases,
>                 "lab_name": None,
>                 "kernel": None,
>                 "job": None,
>                 "git_branch": "kselftest",
>         }
> +       return test_group
> +
> +def get_json_result(test_result: TestResult, def_config: str, build_dir: Optional[str],
> +               json_path: str) -> str:
> +       test_group = _get_group_json(test_result.test, def_config, build_dir)
> +       test_group["name"] = "KUnit Test Group"
>         json_obj = json.dumps(test_group, indent=4)
>         if json_path != 'stdout':
>                 with open(json_path, 'w') as result_path:
> diff --git a/tools/testing/kunit/kunit_parser.py b/tools/testing/kunit/kunit_parser.py
> index 6310a641b151..4b6086159c7f 100644
> --- a/tools/testing/kunit/kunit_parser.py
> +++ b/tools/testing/kunit/kunit_parser.py
> @@ -1,11 +1,15 @@
>  # SPDX-License-Identifier: GPL-2.0
>  #
> -# Parses test results from a kernel dmesg log.
> +# Parses KTAP test results from a kernel dmesg log and incrementally prints
> +# results with reader-friendly format. Stores and returns test results in a
> +# Test object.
>  #
>  # Copyright (C) 2019, Google LLC.
>  # Author: Felix Guo <felixguoxiuping@...il.com>
>  # Author: Brendan Higgins <brendanhiggins@...gle.com>
> +# Author: Rae Moar <rmoar@...gle.com>
>
> +from __future__ import annotations
>  import re
>
>  from collections import namedtuple
> @@ -14,33 +18,55 @@ from enum import Enum, auto
>  from functools import reduce
>  from typing import Iterable, Iterator, List, Optional, Tuple
>
> -TestResult = namedtuple('TestResult', ['status','suites','log'])
> -
> -class TestSuite(object):
> -       def __init__(self) -> None:
> -               self.status = TestStatus.SUCCESS
> -               self.name = ''
> -               self.cases = []  # type: List[TestCase]
> -
> -       def __str__(self) -> str:
> -               return 'TestSuite(' + str(self.status) + ',' + self.name + ',' + str(self.cases) + ')'
> -
> -       def __repr__(self) -> str:
> -               return str(self)
> -
> -class TestCase(object):
> +TestResult = namedtuple('TestResult', ['status','test','log'])
> +
> +class Test(object):
> +       """
> +       A class to represent a test parsed from KTAP results. All KTAP
> +       results within a test log are stored in a main Test object as
> +       subtests.
> +
> +       Attributes:
> +       status : TestStatus - status of the test
> +       name : str - name of the test
> +       expected_count : int - expected number of subtests (0 if single
> +               test case and None if unknown expected number of subtests)
> +       subtests : List[Test] - list of subtests
> +       log : List[str] - log of KTAP lines that correspond to the test
> +       counts : TestCounts - counts of the test statuses and errors of
> +               subtests or of the test itself if the test is a single
> +               test case.
> +       """
>         def __init__(self) -> None:
> +               """Constructs the default attributes of a Test class object.
> +               """
>                 self.status = TestStatus.SUCCESS
>                 self.name = ''
> +               self.expected_count = 0  # type: Optional[int]
> +               self.subtests = []  # type: List[Test]
>                 self.log = []  # type: List[str]
> +               self.counts = TestCounts()
>
>         def __str__(self) -> str:
> -               return 'TestCase(' + str(self.status) + ',' + self.name + ',' + str(self.log) + ')'
> +               """Returns string representation of a Test class object."""
> +               return ('Test(' + str(self.status) + ', ' + self.name +
> +                       ', ' + str(self.expected_count) + ', ' +
> +                       str(self.subtests) + ', ' + str(self.log) + ', ' +
> +                       str(self.counts) + ')')
>
>         def __repr__(self) -> str:
> +               """Returns string representation of a Test class object."""
>                 return str(self)
>
> +       def add_error(self, error_message: str) -> None:
> +               """Adds error to test object by incrementing the error count
> +               and printing the error message.
> +               """
> +               self.counts.errors += 1
> +               print_error('Test ' + self.name + ': ' + error_message)
> +
>  class TestStatus(Enum):
> +       """An enumeration class to represent the status of a test."""
>         SUCCESS = auto()
>         FAILURE = auto()
>         SKIPPED = auto()
> @@ -48,381 +74,769 @@ class TestStatus(Enum):
>         NO_TESTS = auto()
>         FAILURE_TO_PARSE_TESTS = auto()
>
> +class TestCounts:
> +       """
> +       A class to represent the counts of statuses and test errors of
> +       subtests or of the test itself if the test is a single test case with
> +       no subtests. Note that the sum of the counts of passed, failed,
> +       crashed, and skipped should sum to the total number of subtests for
> +       the test.
> +
> +       Attributes:
> +       passed : int - the number of tests that have passed
> +       failed : int - the number of tests that have failed
> +       crashed : int - the number of tests that have crashed
> +       skipped : int - the number of tests that have skipped
> +       errors : int - the number of errors in the test and subtests
> +       """
> +       def __init__(self):
> +               """Contructs the default attributes of a TestCounts class
> +               object. Sets the counts of all test statuses and test
> +               errors to be 0.
> +               """
> +               self.passed = 0
> +               self.failed = 0
> +               self.crashed = 0
> +               self.skipped = 0
> +               self.errors = 0
> +
> +       def __str__(self) -> str:
> +               """Returns the string representation of a TestCounts object.
> +               """
> +               return ('Passed: ' + str(self.passed) +
> +                       ', Failed: ' + str(self.failed) +
> +                       ', Crashed: ' + str(self.crashed) +
> +                       ', Skipped: ' + str(self.skipped) +
> +                       ', Errors: ' + str(self.errors))
> +
> +       def total(self) -> int:
> +               """Returns total number of subtests or 1 if the test object
> +               has no subtests to represent the test itself. This number is
> +               calculated by the sum of the passed, failed, crashed, and
> +               skipped subtests.
> +               """
> +               return (self.passed + self.failed + self.crashed +
> +                       self.skipped)
> +
> +       def add_subtest_counts(self, counts: TestCounts) -> None:
> +               """
> +               Adds the counts of another TestCounts object to the current
> +               TestCounts object. Used to add the counts of a subtest to the
> +               parent test.
> +
> +               Parameters:
> +               counts - a different TestCounts object whose counts
> +                       will be added to the counts of the TestCounts object
> +               """
> +               self.passed += counts.passed
> +               self.failed += counts.failed
> +               self.crashed += counts.crashed
> +               self.skipped += counts.skipped
> +               self.errors += counts.errors
> +
> +       def get_status(self) -> TestStatus:
> +               """Returns the expected status of a Test using test counts."""
> +               if self.crashed:
> +                       # If one of the subtests crash, the expected status
> +                       # of the Test is crashed.
> +                       return TestStatus.TEST_CRASHED
> +               elif self.failed:
> +                       # Otherwise if one of the subtests fail, the
> +                       # expected status of the Test is failed.
> +                       return TestStatus.FAILURE
> +               elif self.passed:
> +                       # Otherwise if one of the subtests pass, the
> +                       # expected status of the Test is passed.
> +                       return TestStatus.SUCCESS
> +               else:
> +                       # Finally, if none of the subtests have failed,
> +                       # crashed, or passed, the expected status of the
> +                       # Test is skipped.
> +                       return TestStatus.SKIPPED
> +
> +       def add_status(self, status: TestStatus) -> None:
> +               """
> +               Given inputted status, increments corresponding attribute of
> +               TestCounts object.
> +
> +               Parameters:
> +               status - status to be added to the TestCounts object
> +               """
> +               if status == TestStatus.SUCCESS or \
> +                               status == TestStatus.NO_TESTS:
> +                       # if status is NO_TESTS the most appropriate
> +                       # attribute to increment is passed because
> +                       # the test did not fail, crash or get skipped.
> +                       self.passed += 1
> +               elif status == TestStatus.FAILURE:
> +                       self.failed += 1
> +               elif status == TestStatus.SKIPPED:
> +                       self.skipped += 1
> +               else:
> +                       self.crashed += 1
> +
>  class LineStream:
> -       """Provides a peek()/pop() interface over an iterator of (line#, text)."""
> +       """
> +       A class to represent the lines of kernel output.
> +       Provides a peek()/pop() interface over an iterator of
> +       (line#, text).
> +       """
>         _lines: Iterator[Tuple[int, str]]
>         _next: Tuple[int, str]
>         _done: bool
>
>         def __init__(self, lines: Iterator[Tuple[int, str]]):
> +               """Set defaults for LineStream object and sets _lines
> +               attribute to lines parameter.
> +               """
>                 self._lines = lines
>                 self._done = False
>                 self._next = (0, '')
>                 self._get_next()
>
>         def _get_next(self) -> None:
> +               """Advances the LineSteam to the next line or sets the _done
> +               attribute if the LineStream has reached the end of the lines.
> +               """
>                 try:
>                         self._next = next(self._lines)
>                 except StopIteration:
>                         self._done = True
>
>         def peek(self) -> str:
> +               """Returns the next line in the LineStream without advancing
> +               the LineStream.
> +               """
>                 return self._next[1]
>
>         def pop(self) -> str:
> +               """Returns the next line in the LineStream and advances the
> +               LineStream to the next line.
> +               """
>                 n = self._next
>                 self._get_next()
>                 return n[1]
>
>         def __bool__(self) -> bool:
> +               """Returns whether the LineStream has reached the end of the
> +               lines.
> +               """
>                 return not self._done
>
>         # Only used by kunit_tool_test.py.
>         def __iter__(self) -> Iterator[str]:
> +               """Empties all lines stored in LineStream object into
> +               Iterator object and returns the Iterator object.
> +               """
>                 while bool(self):
>                         yield self.pop()
>
>         def line_number(self) -> int:
> +               """Returns the line number of the next line in the
> +               LineStream.
> +               """
>                 return self._next[0]
>
> -kunit_start_re = re.compile(r'TAP version [0-9]+$')
> -kunit_end_re = re.compile('(List of all partitions:|'
> -                         'Kernel panic - not syncing: VFS:|reboot: System halted)')
> +# Parsing helper methods:
> +
> +KTAP_START = re.compile(r'KTAP version ([0-9]+)$')
> +TAP_START = re.compile(r'TAP version ([0-9]+)$')
> +KTAP_END = re.compile('(List of all partitions:|'
> +       'Kernel panic - not syncing: VFS:|reboot: System halted)')
>
>  def extract_tap_lines(kernel_output: Iterable[str]) -> LineStream:
> -       def isolate_kunit_output(kernel_output: Iterable[str]) -> Iterator[Tuple[int, str]]:
> +       """Extracts KTAP lines from inputted kernel output in LineStream
> +       object."""
> +       def isolate_ktap_output(kernel_output: Iterable[str]) \
> +                       -> Iterator[Tuple[int, str]]:
>                 line_num = 0
>                 started = False
>                 for line in kernel_output:
>                         line_num += 1
> -                       line = line.rstrip()  # line always has a trailing \n
> -                       if kunit_start_re.search(line):
> +                       line = line.rstrip()  # remove trailing \n
> +                       if not started and KTAP_START.search(line):
> +                               # start extracting KTAP lines and set prefix
> +                               # to number of characters before version line
> +                               prefix_len = len(
> +                                       line.split('KTAP version')[0])
> +                               started = True
> +                               yield line_num, line[prefix_len:]
> +                       elif not started and TAP_START.search(line):
> +                               # start extracting KTAP lines and set prefix
> +                               # to number of characters before version line
>                                 prefix_len = len(line.split('TAP version')[0])
>                                 started = True
>                                 yield line_num, line[prefix_len:]
> -                       elif kunit_end_re.search(line):
> +                       elif started and KTAP_END.search(line):
> +                               # stop extracting KTAP lines
>                                 break
>                         elif started:
> -                               yield line_num, line[prefix_len:]
> -       return LineStream(lines=isolate_kunit_output(kernel_output))
> -
> -DIVIDER = '=' * 60
> -
> -RESET = '\033[0;0m'
> -
> -def red(text) -> str:
> -       return '\033[1;31m' + text + RESET
> -
> -def yellow(text) -> str:
> -       return '\033[1;33m' + text + RESET
> -
> -def green(text) -> str:
> -       return '\033[1;32m' + text + RESET
> -
> -def print_with_timestamp(message) -> None:
> -       print('[%s] %s' % (datetime.now().strftime('%H:%M:%S'), message))
> -
> -def format_suite_divider(message) -> str:
> -       return '======== ' + message + ' ========'
> -
> -def print_suite_divider(message) -> None:
> -       print_with_timestamp(DIVIDER)
> -       print_with_timestamp(format_suite_divider(message))
> -
> -def print_log(log) -> None:
> -       for m in log:
> -               print_with_timestamp(m)
> -
> -TAP_ENTRIES = re.compile(r'^(TAP|[\s]*ok|[\s]*not ok|[\s]*[0-9]+\.\.[0-9]+|[\s]*# (Subtest:|.*: kunit test case crashed!)).*$')
> -
> -def consume_non_diagnostic(lines: LineStream) -> None:
> -       while lines and not TAP_ENTRIES.match(lines.peek()):
> -               lines.pop()
> -
> -def save_non_diagnostic(lines: LineStream, test_case: TestCase) -> None:
> -       while lines and not TAP_ENTRIES.match(lines.peek()):
> -               test_case.log.append(lines.peek())
> -               lines.pop()
> -
> -OkNotOkResult = namedtuple('OkNotOkResult', ['is_ok','description', 'text'])
> -
> -OK_NOT_OK_SKIP = re.compile(r'^[\s]*(ok|not ok) [0-9]+ - (.*) # SKIP(.*)$')
> -
> -OK_NOT_OK_SUBTEST = re.compile(r'^[\s]+(ok|not ok) [0-9]+ - (.*)$')
> -
> -OK_NOT_OK_MODULE = re.compile(r'^(ok|not ok) ([0-9]+) - (.*)$')
> -
> -def parse_ok_not_ok_test_case(lines: LineStream, test_case: TestCase) -> bool:
> -       save_non_diagnostic(lines, test_case)
> -       if not lines:
> -               test_case.status = TestStatus.TEST_CRASHED
> -               return True
> -       line = lines.peek()
> -       match = OK_NOT_OK_SUBTEST.match(line)
> -       while not match and lines:
> -               line = lines.pop()
> -               match = OK_NOT_OK_SUBTEST.match(line)
> -       if match:
> -               test_case.log.append(lines.pop())
> -               test_case.name = match.group(2)
> -               skip_match = OK_NOT_OK_SKIP.match(line)
> -               if skip_match:
> -                       test_case.status = TestStatus.SKIPPED
> -                       return True
> -               if test_case.status == TestStatus.TEST_CRASHED:
> -                       return True
> -               if match.group(1) == 'ok':
> -                       test_case.status = TestStatus.SUCCESS
> -               else:
> -                       test_case.status = TestStatus.FAILURE
> -               return True
> +                               # remove prefix and any indention and yield
> +                               # line with line number
> +                               line = line[prefix_len:].lstrip()
> +                               yield line_num, line
> +       return LineStream(lines=isolate_ktap_output(kernel_output))
> +
> +def raw_output(kernel_output: Iterable[str]) -> None:
> +       """Prints all lines of kernel output."""
> +       for line in kernel_output:
> +               print(line.rstrip())
> +
> +KTAP_VERSIONS = [1]
> +TAP_VERSIONS = [13, 14]
> +
> +def check_version(version_num: int, accepted_versions: List[int],
> +                       version_type: str, test: Test) -> None:
> +       """
> +       Adds error to test object if version number is too high or too
> +       low.
> +
> +       Parameters:
> +       version_num - The inputted version number from the parsed KTAP or TAP
> +               header line
> +       accepted_version - List of accepted KTAP or TAP versions
> +       version_type - 'KTAP' or 'TAP' depending on the type of
> +               version line.
> +       test - Test object for current test being parsed
> +       """
> +       if version_num < min(accepted_versions):
> +               test.add_error(version_type +
> +                       ' version lower than expected!')
> +       elif version_num > max(accepted_versions):
> +               test.add_error(
> +                       version_type + ' version higher than expected!')
> +
> +def parse_ktap_header(lines: LineStream, test: Test) -> bool:
> +       """
> +       If the next line in LineStream matches the format of KTAP or TAP
> +       header line, the version number is checked, the line is popped,
> +       and returns True. Otherwise the method returns False.
> +
> +       Accepted formats:
> +       - 'KTAP version [version number]'
> +       - 'TAP version [version number]'
> +
> +       Parameters:
> +       lines - LineStream of KTAP output to parse
> +       test - Test object for current test being parsed
> +
> +       Return:
> +       Boolean that represents if the next line in the LineStream was parsed
> +               as the KTAP or TAP header line
> +       """
> +       ktap_match = KTAP_START.match(lines.peek())
> +       tap_match = TAP_START.match(lines.peek())
> +       if ktap_match:
> +               version_num = int(ktap_match.group(1))
> +               check_version(version_num, KTAP_VERSIONS, 'KTAP', test)
> +       elif tap_match:
> +               version_num = int(tap_match.group(1))
> +               check_version(version_num, TAP_VERSIONS, 'TAP', test)
>         else:
>                 return False
> -
> -SUBTEST_DIAGNOSTIC = re.compile(r'^[\s]+# (.*)$')
> -DIAGNOSTIC_CRASH_MESSAGE = re.compile(r'^[\s]+# .*?: kunit test case crashed!$')
> -
> -def parse_diagnostic(lines: LineStream, test_case: TestCase) -> bool:
> -       save_non_diagnostic(lines, test_case)
> -       if not lines:
> +       test.log.append(lines.pop())
> +       return True
> +
> +TEST_HEADER = re.compile(r'^# Subtest: (.*)$')
> +
> +def parse_test_header(lines: LineStream, test: Test) -> bool:
> +       """
> +       If the next line in LineStream matches the format of a test
> +       header line, the name of test is set, the line is popped,
> +       and returns True. Otherwise the method returns False.
> +
> +       Accepted format:
> +       - '# Subtest: [test name]'
> +
> +       Parameters:
> +       lines - LineStream of ktap output to parse
> +       test - Test object for current test being parsed
> +
> +       Return:
> +       Boolean that represents if the next line in the LineStream was parsed
> +               as a test header
> +       """
> +       match = TEST_HEADER.match(lines.peek())
> +       if not match:
>                 return False
> +       test.log.append(lines.pop())
> +       test.name = match.group(1)
> +       return True
> +
> +TEST_PLAN = re.compile(r'1\.\.([0-9]+)')
> +
> +def parse_test_plan(lines: LineStream, test: Test) -> bool:
> +       """
> +       If the next line in LineStream matches the format of a test
> +       plan line, the expected number of subtests is set in test object, an
> +       error is thrown if there are 0 tests, the line is popped,
> +       and returns True. Otherwise the method adds an error that the test
> +       plan is missing to the test object and returns False.
> +
> +       Accepted format:
> +       - '1..[number of subtests]'
> +
> +       Parameters:
> +       lines - LineStream of ktap output to parse
> +       test - Test object for current test being parsed
> +
> +       Return:
> +       Boolean that represents if the next line in the LineStream was parsed
> +               as a test plan
> +       """
> +       match = TEST_PLAN.match(lines.peek())
> +       if not match:
> +               test.expected_count = None
> +               test.add_error('missing plan line!')
> +               return False
> +       test.log.append(lines.pop())
> +       expected_count = int(match.group(1))
> +       test.expected_count = expected_count
> +       if expected_count == 0:
> +               test.status = TestStatus.NO_TESTS
> +               test.add_error('0 tests run!')
> +       return True
> +
> +TEST_RESULT = re.compile(r'^(ok|not ok) ([0-9]+) (- )?(.*)$')
> +
> +TEST_RESULT_SKIP = re.compile(r'^(ok|not ok) ([0-9]+) (- )?(.*) # SKIP(.*)$')
> +
> +def peek_test_name_match(lines: LineStream, test: Test) -> bool:
> +       """
> +       If the next line in LineStream matches the format of a test
> +       result line and the name of the result line matches the name of the
> +       current test, the method returns True. Otherwise it returns False.
> +
> +       Accepted format:
> +       - '[ok|not ok] [test number] [-] [test name] [optional skip
> +               directive]'
> +
> +       Parameters:
> +       lines - LineStream of KTAP output to parse
> +       test - Test object for current test being parsed
> +
> +       Return:
> +       Boolean that represents if the next line in the LineStream matched a
> +               test result line and the name matched the expected test name
> +       """
>         line = lines.peek()
> -       match = SUBTEST_DIAGNOSTIC.match(line)
> -       if match:
> -               test_case.log.append(lines.pop())
> -               crash_match = DIAGNOSTIC_CRASH_MESSAGE.match(line)
> -               if crash_match:
> -                       test_case.status = TestStatus.TEST_CRASHED
> -               return True
> -       else:
> +       match = TEST_RESULT.match(line)
> +       if not match:
>                 return False
> +       name = match.group(4)
> +       return (name == test.name)
> +
> +def parse_test_result(lines: LineStream, test: Test,
> +                       expected_num: int) -> bool:
> +       """
> +       If the next line in LineStream matches the format of a test
> +       result line, the status in the result line is added to the test
> +       object, the test number is checked to match the expected test number
> +       and if not an error is added to the test object, and returns True.
> +       Otherwise it returns False.
> +
> +       Note that the skip diirective is the only
> +       directive that causes a change in status and otherwise the directive
> +       is included in the name of the test.
> +
> +       Accepted format:
> +       - '[ok|not ok] [test number] [-] [test name] [optional skip
> +               directive]'
> +
> +       Parameters:
> +       lines - LineStream of KTAP output to parse
> +       test - Test object for current test being parsed
> +       expected_num - expected test number for current test
> +
> +       Return:
> +       Boolean that represents if the next line in the LineStream was parsed
> +               as a test result line.
> +       """
> +       line = lines.peek()
> +       match = TEST_RESULT.match(line)
> +       skip_match = TEST_RESULT_SKIP.match(line)
>
> -def parse_test_case(lines: LineStream) -> Optional[TestCase]:
> -       test_case = TestCase()
> -       save_non_diagnostic(lines, test_case)
> -       while parse_diagnostic(lines, test_case):
> -               pass
> -       if parse_ok_not_ok_test_case(lines, test_case):
> -               return test_case
> -       else:
> -               return None
> -
> -SUBTEST_HEADER = re.compile(r'^[\s]+# Subtest: (.*)$')
> +       # Check if line matches test result line format
> +       if not match:
> +               return False
> +       test.log.append(lines.pop())
>
> -def parse_subtest_header(lines: LineStream) -> Optional[str]:
> -       consume_non_diagnostic(lines)
> -       if not lines:
> -               return None
> -       match = SUBTEST_HEADER.match(lines.peek())
> -       if match:
> -               lines.pop()
> -               return match.group(1)
> +       # Set name of test object
> +       if skip_match:
> +               test.name = skip_match.group(4)
>         else:
> -               return None
> +               test.name = match.group(4)
>
> -SUBTEST_PLAN = re.compile(r'[\s]+[0-9]+\.\.([0-9]+)')
> +       # Check test num
> +       num = int(match.group(2))
> +       if num != expected_num:
> +               test.add_error('Expected test number ' +
> +                       str(expected_num) + ' but found ' + str(num))
>
> -def parse_subtest_plan(lines: LineStream) -> Optional[int]:
> -       consume_non_diagnostic(lines)
> -       match = SUBTEST_PLAN.match(lines.peek())
> -       if match:
> -               lines.pop()
> -               return int(match.group(1))
> -       else:
> -               return None
> -
> -def max_status(left: TestStatus, right: TestStatus) -> TestStatus:
> -       if left == right:
> -               return left
> -       elif left == TestStatus.TEST_CRASHED or right == TestStatus.TEST_CRASHED:
> -               return TestStatus.TEST_CRASHED
> -       elif left == TestStatus.FAILURE or right == TestStatus.FAILURE:
> -               return TestStatus.FAILURE
> -       elif left == TestStatus.SKIPPED:
> -               return right
> -       else:
> -               return left
> -
> -def parse_ok_not_ok_test_suite(lines: LineStream,
> -                              test_suite: TestSuite,
> -                              expected_suite_index: int) -> bool:
> -       consume_non_diagnostic(lines)
> -       if not lines:
> -               test_suite.status = TestStatus.TEST_CRASHED
> -               return False
> -       line = lines.peek()
> -       match = OK_NOT_OK_MODULE.match(line)
> -       if match:
> -               lines.pop()
> -               if match.group(1) == 'ok':
> -                       test_suite.status = TestStatus.SUCCESS
> -               else:
> -                       test_suite.status = TestStatus.FAILURE
> -               skip_match = OK_NOT_OK_SKIP.match(line)
> -               if skip_match:
> -                       test_suite.status = TestStatus.SKIPPED
> -               suite_index = int(match.group(2))
> -               if suite_index != expected_suite_index:
> -                       print_with_timestamp(
> -                               red('[ERROR] ') + 'expected_suite_index ' +
> -                               str(expected_suite_index) + ', but got ' +
> -                               str(suite_index))
> +       # Set status of test object
> +       status = match.group(1)
> +       if test.status == TestStatus.TEST_CRASHED:
>                 return True
> +       elif skip_match:
> +               test.status = TestStatus.SKIPPED
> +       elif status == 'ok':
> +               test.status = TestStatus.SUCCESS
>         else:
> -               return False
> -
> -def bubble_up_errors(status_list: Iterable[TestStatus]) -> TestStatus:
> -       return reduce(max_status, status_list, TestStatus.SKIPPED)
> +               test.status = TestStatus.FAILURE
> +       return True
> +
> +def parse_diagnostic(lines: LineStream) -> List[str]:
> +       """
> +       If the next line in LineStream does not match the format of a test
> +       case line or test header line, the line is checked if the test has
> +       crashed and if so adds an error message, pops the line and adds it to
> +       the log.
> +
> +       Line formats that are not parsed:
> +       - '# Subtest: [test name]'
> +       - '[ok|not ok] [test number] [-] [test name] [optional skip
> +               directive]'
> +
> +       Parameters:
> +       lines - LineStream of KTAP output to parse
> +
> +       Return:
> +       Log of diagnostic lines
> +       """
> +       log = []  # type: List[str]
> +       while lines and not TEST_RESULT.match(lines.peek()) and not \
> +                       TEST_HEADER.match(lines.peek()):
> +               log.append(lines.pop())
> +       return log
> +
> +DIAGNOSTIC_CRASH_MESSAGE = re.compile(r'^# .*?: kunit test case crashed!$')
> +
> +def parse_crash_in_log(test: Test) -> bool:
> +       """
> +       Iterate through the lines of the log to parse for crash message.
> +       If crash message found, set status to crashed and return True.
> +       Otherwise return False.
> +
> +       Parameters:
> +       test - Test object for current test being parsed
> +
> +       Return:
> +       Boolean that represents if crash message found in log
> +       """
> +       for line in test.log:
> +               if DIAGNOSTIC_CRASH_MESSAGE.match(line):
> +                       test.status = TestStatus.TEST_CRASHED
> +                       return True
> +       return False
>
> -def bubble_up_test_case_errors(test_suite: TestSuite) -> TestStatus:
> -       max_test_case_status = bubble_up_errors(x.status for x in test_suite.cases)
> -       return max_status(max_test_case_status, test_suite.status)
> +# Printing helper methods:
>
> -def parse_test_suite(lines: LineStream, expected_suite_index: int) -> Optional[TestSuite]:
> -       if not lines:
> -               return None
> -       consume_non_diagnostic(lines)
> -       test_suite = TestSuite()
> -       test_suite.status = TestStatus.SUCCESS
> -       name = parse_subtest_header(lines)
> -       if not name:
> -               return None
> -       test_suite.name = name
> -       expected_test_case_num = parse_subtest_plan(lines)
> -       if expected_test_case_num is None:
> -               return None
> -       while expected_test_case_num > 0:
> -               test_case = parse_test_case(lines)
> -               if not test_case:
> -                       break
> -               test_suite.cases.append(test_case)
> -               expected_test_case_num -= 1
> -       if parse_ok_not_ok_test_suite(lines, test_suite, expected_suite_index):
> -               test_suite.status = bubble_up_test_case_errors(test_suite)
> -               return test_suite
> -       elif not lines:
> -               print_with_timestamp(red('[ERROR] ') + 'ran out of lines before end token')
> -               return test_suite
> -       else:
> -               print(f'failed to parse end of suite "{name}", at line {lines.line_number()}: {lines.peek()}')
> -               return None
> +DIVIDER = '=' * 60
>
> -TAP_HEADER = re.compile(r'^TAP version 14$')
> +RESET = '\033[0;0m'
>
> -def parse_tap_header(lines: LineStream) -> bool:
> -       consume_non_diagnostic(lines)
> -       if TAP_HEADER.match(lines.peek()):
> -               lines.pop()
> -               return True
> -       else:
> -               return False
> +def red(text: str) -> str:
> +       """Returns inputted string with red color code."""
> +       return '\033[1;31m' + text + RESET
>
> -TEST_PLAN = re.compile(r'[0-9]+\.\.([0-9]+)')
> +def yellow(text: str) -> str:
> +       """Returns inputted string with yellow color code."""
> +       return '\033[1;33m' + text + RESET
>
> -def parse_test_plan(lines: LineStream) -> Optional[int]:
> -       consume_non_diagnostic(lines)
> -       match = TEST_PLAN.match(lines.peek())
> -       if match:
> -               lines.pop()
> -               return int(match.group(1))
> -       else:
> -               return None
> -
> -def bubble_up_suite_errors(test_suites: Iterable[TestSuite]) -> TestStatus:
> -       return bubble_up_errors(x.status for x in test_suites)
> -
> -def parse_test_result(lines: LineStream) -> TestResult:
> -       consume_non_diagnostic(lines)
> -       if not lines or not parse_tap_header(lines):
> -               return TestResult(TestStatus.FAILURE_TO_PARSE_TESTS, [], lines)
> -       expected_test_suite_num = parse_test_plan(lines)
> -       if expected_test_suite_num == 0:
> -               return TestResult(TestStatus.NO_TESTS, [], lines)
> -       elif expected_test_suite_num is None:
> -               return TestResult(TestStatus.FAILURE_TO_PARSE_TESTS, [], lines)
> -       test_suites = []
> -       for i in range(1, expected_test_suite_num + 1):
> -               test_suite = parse_test_suite(lines, i)
> -               if test_suite:
> -                       test_suites.append(test_suite)
> -               else:
> -                       print_with_timestamp(
> -                               red('[ERROR] ') + ' expected ' +
> -                               str(expected_test_suite_num) +
> -                               ' test suites, but got ' + str(i - 2))
> -                       break
> -       test_suite = parse_test_suite(lines, -1)
> -       if test_suite:
> -               print_with_timestamp(red('[ERROR] ') +
> -                       'got unexpected test suite: ' + test_suite.name)
> -       if test_suites:
> -               return TestResult(bubble_up_suite_errors(test_suites), test_suites, lines)
> -       else:
> -               return TestResult(TestStatus.NO_TESTS, [], lines)
> +def green(text: str) -> str:
> +       """Returns inputted string with green color code."""
> +       return '\033[1;32m' + text + RESET
>
> -class TestCounts:
> -       passed: int
> -       failed: int
> -       crashed: int
> -       skipped: int
> +ANSI_LEN = len(red(''))
>
> -       def __init__(self):
> -               self.passed = 0
> -               self.failed = 0
> -               self.crashed = 0
> -               self.skipped = 0
> +def print_with_timestamp(message: str) -> None:
> +       """Prints message with timestamp at beginning."""
> +       print('[%s] %s' % (datetime.now().strftime('%H:%M:%S'), message))
>
> -       def total(self) -> int:
> -               return self.passed + self.failed + self.crashed + self.skipped
> -
> -def print_and_count_results(test_result: TestResult) -> TestCounts:
> -       counts = TestCounts()
> -       for test_suite in test_result.suites:
> -               if test_suite.status == TestStatus.SUCCESS:
> -                       print_suite_divider(green('[PASSED] ') + test_suite.name)
> -               elif test_suite.status == TestStatus.SKIPPED:
> -                       print_suite_divider(yellow('[SKIPPED] ') + test_suite.name)
> -               elif test_suite.status == TestStatus.TEST_CRASHED:
> -                       print_suite_divider(red('[CRASHED] ' + test_suite.name))
> +def format_test_divider(message: str, len_message: int) -> str:
> +       """
> +       Returns string with message centered in fixed width divider.
> +
> +       Example:
> +       '===================== message example ====================='
> +
> +       Parameters:
> +       message - message to be centered in divider line
> +       len_message - length of the message to be printed such that
> +               any characters of the color codes are not counted
> +
> +       Return:
> +       String containing message centered in fixed width divider
> +       """
> +       default_count = 3  # default number of dashes
> +       len_1 = default_count
> +       len_2 = default_count
> +       difference = len(DIVIDER) - len_message - 2  # 2 spaces added
> +       if difference > 0:
> +               # calculate number of dashes for each side of the divider
> +               len_1 = int(difference / 2)
> +               len_2 = difference - len_1
> +       return ('=' * len_1) + ' ' + message + ' ' + ('=' * len_2)
> +
> +def print_test_header(test: Test) -> None:
> +       """
> +       Prints test header with test name and optionally the expected number
> +       of subtests.
> +
> +       Example:
> +       '=================== example (2 subtests) ==================='
> +
> +       Parameters:
> +       test - Test object representing current test being printed
> +       """
> +       message = test.name
> +       if test.expected_count:
> +               message += ' (' + str(test.expected_count) + ' subtests)'
> +       print_with_timestamp(format_test_divider(message, len(message)))
> +
> +def print_log(log: Iterable[str]) -> None:
> +       """
> +       Prints all strings in saved log for test in yellow.
> +
> +       Parameters:
> +       log - Iterable object with all strings saved in log for test
> +       """
> +       for m in log:
> +               print_with_timestamp(yellow(m))
> +       print_with_timestamp('')
> +
> +def format_test_result(test: Test) -> str:
> +       """
> +       Returns string with formatted test result with colored status and test
> +       name.
> +
> +       Example:
> +       '[PASSED] example'
> +
> +       Parameters:
> +       test - Test object representing current test being printed
> +
> +       Return:
> +       String containing formatted test result
> +       """
> +       if test.status == TestStatus.SUCCESS:
> +               return (green('[PASSED] ') + test.name)
> +       elif test.status == TestStatus.SKIPPED:
> +               return (yellow('[SKIPPED] ') + test.name)
> +       elif test.status == TestStatus.TEST_CRASHED:
> +               print_log(test.log)
> +               return (red('[CRASHED] ') + test.name)
> +       else:
> +               print_log(test.log)
> +               return (red('[FAILED] ') + test.name)
> +
> +def print_test_result(test: Test) -> None:
> +       """
> +       Prints result line with status of test.
> +
> +       Example:
> +       '[PASSED] example'
> +
> +       Parameters:
> +       test - Test object representing current test being printed
> +       """
> +       print_with_timestamp(format_test_result(test))
> +
> +def print_test_footer(test: Test) -> None:
> +       """
> +       Prints test footer with status of test.
> +
> +       Example:
> +       '===================== [PASSED] example ====================='
> +
> +       Parameters:
> +       test - Test object representing current test being printed
> +       """
> +       message = format_test_result(test)
> +       print_with_timestamp(format_test_divider(message,
> +               len(message) - ANSI_LEN))
> +
> +def print_summary_line(test: Test) -> None:
> +       """
> +       Prints summary line of test object. Color of line is dependent on
> +       status of test. Color is green if test passes, yellow if test is
> +       skipped, and red if the test fails or crashes. Summary line contains
> +       counts of the statuses of the tests subtests or the test itself if it
> +       has no subtests.
> +
> +       Example:
> +       "Testing complete. Passed: 2, Failed: 0, Crashed: 0, Skipped: 0,
> +       Errors: 0"
> +
> +       test - Test object representing current test being printed
> +       """
> +       if test.status == TestStatus.SUCCESS or \
> +                       test.status == TestStatus.NO_TESTS:
> +               color = green
> +       elif test.status == TestStatus.SKIPPED:
> +               color = yellow
> +       else:
> +               color = red
> +       counts = test.counts
> +       print_with_timestamp(color('Testing complete. ' + str(counts)))
> +
> +def print_error(error_message: str) -> None:
> +       """
> +       Prints error message with error format.
> +
> +       Example:
> +       "[ERROR] Test example: missing test plan!"
> +
> +       Parameters:
> +       error_message - message describing error
> +       """
> +       print_with_timestamp(red('[ERROR] ') + error_message)
> +
> +# Other methods:
> +
> +def bubble_up_test_results(test: Test) -> None:
> +       """
> +       If the test has subtests, add the test counts of the subtests to the
> +       test and check if any of the tests crashed and if so set the test
> +       status to crashed. Otherwise if the test has no subtests add the
> +       status of the test to the test counts.
> +
> +       Parameters:
> +       test - Test object for current test being parsed
> +       """
> +       parse_crash_in_log(test)
> +       subtests = test.subtests
> +       counts = test.counts
> +       status = test.status
> +       for t in subtests:
> +               counts.add_subtest_counts(t.counts)
> +       if counts.total() == 0:
> +               counts.add_status(status)
> +       elif test.counts.get_status() == TestStatus.TEST_CRASHED:
> +               test.status = TestStatus.TEST_CRASHED
> +
> +def parse_test(lines: LineStream, expected_num: int, log: List[str]) -> Test:
> +       """
> +       Finds next test to parse in LineStream, creates new Test object,
> +       parses any subtests of the test, populates Test object with all
> +       information (status, name) about the test and the Test objects for
> +       any subtests, and then returns the Test object. The method accepts
> +       three formats of tests:
> +
> +       Accepted test formats:
> +
> +       - Main KTAP/TAP header
> +
> +       Example:
> +
> +       KTAP version 1
> +       1..4
> +       [subtests]
> +
> +       - Subtest header line
> +
> +       Example:
> +
> +       # Subtest: name
> +       1..3
> +       [subtests]
> +       ok 1 name
> +
> +       - Test result line
> +
> +       Example:
> +
> +       ok 1 - test
> +
> +       Parameters:
> +       lines - LineStream of KTAP output to parse
> +       expected_num - expected test number for test to be parsed
> +       log - list of strings containing any preceding diagnostic lines
> +               corresponding to the current test
> +
> +       Return:
> +       Test object populated with characteristics and any subtests
> +       """
> +       test = Test()
> +       test.log.extend(log)
> +       parent_test = False
> +       main = parse_ktap_header(lines, test)
> +       if main:
> +               # If KTAP/TAP header is found, attempt to parse
> +               # test plan
> +               test.name = "main"
> +               parse_test_plan(lines, test)
> +       else:
> +               # If KTAP/TAP header is not found, test must be subtest
> +               # header or test result line so parse attempt to parser
> +               # subtest header
> +               parent_test = parse_test_header(lines, test)
> +               if parent_test:
> +                       # If subtest header is found, attempt to parse
> +                       # test plan and print header
> +                       parse_test_plan(lines, test)
> +                       print_test_header(test)
> +       expected_count = test.expected_count
> +       subtests = []
> +       test_num = 1
> +       while main or expected_count is None or test_num <= expected_count:
> +               # Loop to parse any subtests.
> +               # If test is main test, do not break until no lines left.
> +               # Otherwise, break after parsing expected number of tests or
> +               # if expected number of tests is unknown break when found
> +               # test result line with matching name to subtest header.
> +               if not lines:
> +                       if expected_count and test_num <= expected_count:
> +                               test.add_error('missing expected subtests!')
> +                       break
> +               sub_log = parse_diagnostic(lines)
> +               if not expected_count and not main and \
> +                               peek_test_name_match(lines, test):
> +                       test.log.extend(sub_log)
> +                       break
> +               subtests.append(parse_test(lines, test_num, sub_log))
> +               test_num += 1
> +       test.subtests = subtests
> +       if not main:
> +               # If not main test, look for test result line
> +               test.log.extend(parse_diagnostic(lines))
> +               if (parent_test and peek_test_name_match(lines, test)) or \
> +                               not parent_test:
> +                       parse_test_result(lines, test, expected_num)
>                 else:
> -                       print_suite_divider(red('[FAILED] ') + test_suite.name)
> -               for test_case in test_suite.cases:
> -                       if test_case.status == TestStatus.SUCCESS:
> -                               counts.passed += 1
> -                               print_with_timestamp(green('[PASSED] ') + test_case.name)
> -                       elif test_case.status == TestStatus.SKIPPED:
> -                               counts.skipped += 1
> -                               print_with_timestamp(yellow('[SKIPPED] ') + test_case.name)
> -                       elif test_case.status == TestStatus.TEST_CRASHED:
> -                               counts.crashed += 1
> -                               print_with_timestamp(red('[CRASHED] ' + test_case.name))
> -                               print_log(map(yellow, test_case.log))
> -                               print_with_timestamp('')
> -                       else:
> -                               counts.failed += 1
> -                               print_with_timestamp(red('[FAILED] ') + test_case.name)
> -                               print_log(map(yellow, test_case.log))
> -                               print_with_timestamp('')
> -       return counts
> +                       test.add_error('missing subtest result line!')
> +       # Add statuses to TestCounts attribute in Test object
> +       bubble_up_test_results(test)
> +       if parent_test:
> +               # If test has subtests and is not the main test object, print
> +               # footer.
> +               print_test_footer(test)
> +       elif not main:
> +               print_test_result(test)
> +       return test
>
>  def parse_run_tests(kernel_output: Iterable[str]) -> TestResult:
> -       counts = TestCounts()
> +       """
> +       Using kernel output, extract KTAP lines, parse the lines for test
> +       results and print condensed test results and summary line .
> +
> +       Parameters:
> +       kernel_output - Iterable object contains lines of kernel output
> +
> +       Return:
> +       TestResult - Tuple containg status of main test object, main test
> +               object with all subtests, and log of all KTAP lines.
> +       """
> +       print_with_timestamp(DIVIDER)
>         lines = extract_tap_lines(kernel_output)
> -       test_result = parse_test_result(lines)
> -       if test_result.status == TestStatus.NO_TESTS:
> -               print(red('[ERROR] ') + yellow('no tests run!'))
> -       elif test_result.status == TestStatus.FAILURE_TO_PARSE_TESTS:
> -               print(red('[ERROR] ') + yellow('could not parse test results!'))
> +       test = Test()
> +       if not lines:
> +               test.add_error('invalid KTAP input!')
> +               test.status = TestStatus.FAILURE_TO_PARSE_TESTS
>         else:
> -               counts = print_and_count_results(test_result)
> +               test = parse_test(lines, 0, [])
> +               if test.status != TestStatus.NO_TESTS:
> +                       test.status = test.counts.get_status()
>         print_with_timestamp(DIVIDER)
> -       if test_result.status == TestStatus.SUCCESS:
> -               fmt = green
> -       elif test_result.status == TestStatus.SKIPPED:
> -               fmt = yellow
> -       else:
> -               fmt =red
> -       print_with_timestamp(
> -               fmt('Testing complete. %d tests run. %d failed. %d crashed. %d skipped.' %
> -                   (counts.total(), counts.failed, counts.crashed, counts.skipped)))
> -       return test_result
> +       print_summary_line(test)
> +       return TestResult(test.status, test, lines)
> diff --git a/tools/testing/kunit/kunit_tool_test.py b/tools/testing/kunit/kunit_tool_test.py
> index 3251cef25b76..50c4d3e74115 100755
> --- a/tools/testing/kunit/kunit_tool_test.py
> +++ b/tools/testing/kunit/kunit_tool_test.py
> @@ -106,10 +106,10 @@ class KUnitParserTest(unittest.TestCase):
>                 with open(log_path) as file:
>                         result = kunit_parser.extract_tap_lines(file.readlines())
>                 self.assertContains('TAP version 14', result)
> -               self.assertContains('   # Subtest: example', result)
> -               self.assertContains('   1..2', result)
> -               self.assertContains('   ok 1 - example_simple_test', result)
> -               self.assertContains('   ok 2 - example_mock_test', result)
> +               self.assertContains('# Subtest: example', result)
> +               self.assertContains('1..2', result)
> +               self.assertContains('ok 1 - example_simple_test', result)
> +               self.assertContains('ok 2 - example_mock_test', result)
>                 self.assertContains('ok 1 - example', result)
>
>         def test_output_with_prefix_isolated_correctly(self):
> @@ -117,28 +117,28 @@ class KUnitParserTest(unittest.TestCase):
>                 with open(log_path) as file:
>                         result = kunit_parser.extract_tap_lines(file.readlines())
>                 self.assertContains('TAP version 14', result)
> -               self.assertContains('   # Subtest: kunit-resource-test', result)
> -               self.assertContains('   1..5', result)
> -               self.assertContains('   ok 1 - kunit_resource_test_init_resources', result)
> -               self.assertContains('   ok 2 - kunit_resource_test_alloc_resource', result)
> -               self.assertContains('   ok 3 - kunit_resource_test_destroy_resource', result)
> -               self.assertContains(' foo bar   #', result)
> -               self.assertContains('   ok 4 - kunit_resource_test_cleanup_resources', result)
> -               self.assertContains('   ok 5 - kunit_resource_test_proper_free_ordering', result)
> +               self.assertContains('# Subtest: kunit-resource-test', result)
> +               self.assertContains('1..5', result)
> +               self.assertContains('ok 1 - kunit_resource_test_init_resources', result)
> +               self.assertContains('ok 2 - kunit_resource_test_alloc_resource', result)
> +               self.assertContains('ok 3 - kunit_resource_test_destroy_resource', result)
> +               self.assertContains('foo bar    #', result)
> +               self.assertContains('ok 4 - kunit_resource_test_cleanup_resources', result)
> +               self.assertContains('ok 5 - kunit_resource_test_proper_free_ordering', result)
>                 self.assertContains('ok 1 - kunit-resource-test', result)
> -               self.assertContains(' foo bar   # non-kunit output', result)
> -               self.assertContains('   # Subtest: kunit-try-catch-test', result)
> -               self.assertContains('   1..2', result)
> -               self.assertContains('   ok 1 - kunit_test_try_catch_successful_try_no_catch',
> +               self.assertContains('foo bar    # non-kunit output', result)
> +               self.assertContains('# Subtest: kunit-try-catch-test', result)
> +               self.assertContains('1..2', result)
> +               self.assertContains('ok 1 - kunit_test_try_catch_successful_try_no_catch',
>                                     result)
> -               self.assertContains('   ok 2 - kunit_test_try_catch_unsuccessful_try_does_catch',
> +               self.assertContains('ok 2 - kunit_test_try_catch_unsuccessful_try_does_catch',
>                                     result)
>                 self.assertContains('ok 2 - kunit-try-catch-test', result)
> -               self.assertContains('   # Subtest: string-stream-test', result)
> -               self.assertContains('   1..3', result)
> -               self.assertContains('   ok 1 - string_stream_test_empty_on_creation', result)
> -               self.assertContains('   ok 2 - string_stream_test_not_empty_after_add', result)
> -               self.assertContains('   ok 3 - string_stream_test_get_string', result)
> +               self.assertContains('# Subtest: string-stream-test', result)
> +               self.assertContains('1..3', result)
> +               self.assertContains('ok 1 - string_stream_test_empty_on_creation', result)
> +               self.assertContains('ok 2 - string_stream_test_not_empty_after_add', result)
> +               self.assertContains('ok 3 - string_stream_test_get_string', result)
>                 self.assertContains('ok 3 - string-stream-test', result)
>
>         def test_parse_successful_test_log(self):
> @@ -148,6 +148,13 @@ class KUnitParserTest(unittest.TestCase):
>                 self.assertEqual(
>                         kunit_parser.TestStatus.SUCCESS,
>                         result.status)
> +       def test_parse_successful_nested_tests_log(self):
> +               all_passed_log = test_data_path('test_is_test_passed-all_passed_nested.log')
> +               with open(all_passed_log) as file:
> +                       result = kunit_parser.parse_run_tests(file.readlines())
> +               self.assertEqual(
> +                       kunit_parser.TestStatus.SUCCESS,
> +                       result.status)
>
>         def test_parse_failed_test_log(self):
>                 failed_log = test_data_path('test_is_test_passed-failure.log')
> @@ -162,17 +169,31 @@ class KUnitParserTest(unittest.TestCase):
>                 with open(empty_log) as file:
>                         result = kunit_parser.parse_run_tests(
>                                 kunit_parser.extract_tap_lines(file.readlines()))
> -               self.assertEqual(0, len(result.suites))
> +               self.assertEqual(0, len(result.test.subtests))
>                 self.assertEqual(
>                         kunit_parser.TestStatus.FAILURE_TO_PARSE_TESTS,
>                         result.status)
>
> +       def test_missing_test_plan(self):
> +               missing_plan_log = test_data_path('test_is_test_passed-'
> +                       'missing_plan.log')
> +               with open(missing_plan_log) as file:
> +                       result = kunit_parser.parse_run_tests(
> +                               kunit_parser.extract_tap_lines(
> +                               file.readlines()))
> +               self.assertEqual(2, result.test.counts.errors)
> +               self.assertEqual(
> +                       kunit_parser.TestStatus.SUCCESS,
> +                       result.status)
> +
>         def test_no_tests(self):
> -               empty_log = test_data_path('test_is_test_passed-no_tests_run_with_header.log')
> -               with open(empty_log) as file:
> +               header_log = test_data_path('test_is_test_passed-'
> +                       'no_tests_run_with_header.log')
> +               with open(header_log) as file:
>                         result = kunit_parser.parse_run_tests(
> -                               kunit_parser.extract_tap_lines(file.readlines()))
> -               self.assertEqual(0, len(result.suites))
> +                               kunit_parser.extract_tap_lines(
> +                               file.readlines()))
> +               self.assertEqual(0, len(result.test.subtests))
>                 self.assertEqual(
>                         kunit_parser.TestStatus.NO_TESTS,
>                         result.status)
> @@ -182,15 +203,17 @@ class KUnitParserTest(unittest.TestCase):
>                 print_mock = mock.patch('builtins.print').start()
>                 with open(crash_log) as file:
>                         result = kunit_parser.parse_run_tests(
> -                               kunit_parser.extract_tap_lines(file.readlines()))
> -               print_mock.assert_any_call(StrContains('could not parse test results!'))
> +                               kunit_parser.extract_tap_lines(
> +                               file.readlines()))
> +               print_mock.assert_any_call(StrContains('invalid KTAP input!'))
>                 print_mock.stop()
>                 file.close()
>
>         def test_crashed_test(self):
>                 crashed_log = test_data_path('test_is_test_passed-crash.log')
>                 with open(crashed_log) as file:
> -                       result = kunit_parser.parse_run_tests(file.readlines())
> +                       result = kunit_parser.parse_run_tests(
> +                               file.readlines())
>                 self.assertEqual(
>                         kunit_parser.TestStatus.TEST_CRASHED,
>                         result.status)
> @@ -216,6 +239,23 @@ class KUnitParserTest(unittest.TestCase):
>                         result.status)
>                 file.close()
>
> +       def test_ignores_hyphen(self):
> +               hyphen_log = test_data_path('test_strip_hyphen.log')
> +               file = open(hyphen_log)
> +               result = kunit_parser.parse_run_tests(file.readlines())
> +
> +               # A skipped test does not fail the whole suite.
> +               self.assertEqual(
> +                       kunit_parser.TestStatus.SUCCESS,
> +                       result.status)
> +               self.assertEqual(
> +                       "sysctl_test",
> +                       result.test.subtests[0].name)
> +               self.assertEqual(
> +                       "example",
> +                       result.test.subtests[1].name)
> +               file.close()
> +
>
>         def test_ignores_prefix_printk_time(self):
>                 prefix_log = test_data_path('test_config_printk_time.log')
> @@ -224,7 +264,7 @@ class KUnitParserTest(unittest.TestCase):
>                         self.assertEqual(
>                                 kunit_parser.TestStatus.SUCCESS,
>                                 result.status)
> -                       self.assertEqual('kunit-resource-test', result.suites[0].name)
> +                       self.assertEqual('kunit-resource-test', result.test.subtests[0].name)
>
>         def test_ignores_multiple_prefixes(self):
>                 prefix_log = test_data_path('test_multiple_prefixes.log')
> @@ -233,7 +273,7 @@ class KUnitParserTest(unittest.TestCase):
>                         self.assertEqual(
>                                 kunit_parser.TestStatus.SUCCESS,
>                                 result.status)
> -                       self.assertEqual('kunit-resource-test', result.suites[0].name)
> +                       self.assertEqual('kunit-resource-test', result.test.subtests[0].name)
>
>         def test_prefix_mixed_kernel_output(self):
>                 mixed_prefix_log = test_data_path('test_interrupted_tap_output.log')
> @@ -242,7 +282,7 @@ class KUnitParserTest(unittest.TestCase):
>                         self.assertEqual(
>                                 kunit_parser.TestStatus.SUCCESS,
>                                 result.status)
> -                       self.assertEqual('kunit-resource-test', result.suites[0].name)
> +                       self.assertEqual('kunit-resource-test', result.test.subtests[0].name)
>
>         def test_prefix_poundsign(self):
>                 pound_log = test_data_path('test_pound_sign.log')
> @@ -251,16 +291,16 @@ class KUnitParserTest(unittest.TestCase):
>                         self.assertEqual(
>                                 kunit_parser.TestStatus.SUCCESS,
>                                 result.status)
> -                       self.assertEqual('kunit-resource-test', result.suites[0].name)
> +                       self.assertEqual('kunit-resource-test', result.test.subtests[0].name)
>
>         def test_kernel_panic_end(self):
>                 panic_log = test_data_path('test_kernel_panic_interrupt.log')
>                 with open(panic_log) as file:
>                         result = kunit_parser.parse_run_tests(file.readlines())
>                         self.assertEqual(
> -                               kunit_parser.TestStatus.TEST_CRASHED,
> +                               kunit_parser.TestStatus.SUCCESS,
>                                 result.status)
> -                       self.assertEqual('kunit-resource-test', result.suites[0].name)
> +                       self.assertEqual('kunit-resource-test', result.test.subtests[0].name)
>
>         def test_pound_no_prefix(self):
>                 pound_log = test_data_path('test_pound_no_prefix.log')
> @@ -269,7 +309,7 @@ class KUnitParserTest(unittest.TestCase):
>                         self.assertEqual(
>                                 kunit_parser.TestStatus.SUCCESS,
>                                 result.status)
> -                       self.assertEqual('kunit-resource-test', result.suites[0].name)
> +                       self.assertEqual('kunit-resource-test', result.test.subtests[0].name)
>
>  class LinuxSourceTreeTest(unittest.TestCase):
>
> @@ -291,6 +331,14 @@ class LinuxSourceTreeTest(unittest.TestCase):
>                                 pass
>                         tree = kunit_kernel.LinuxSourceTree('', kunitconfig_path=dir)
>
> +       def test_kselftest_nested(self):
> +               kselftest_log = test_data_path('test_is_test_passed-kselftest.log')
> +               with open(kselftest_log) as file:
> +                       result = kunit_parser.parse_run_tests(file.readlines())
> +                       self.assertEqual(
> +                               kunit_parser.TestStatus.SUCCESS,
> +                               result.status)
> +
>         # TODO: add more test cases.
>
>
> @@ -322,6 +370,12 @@ class KUnitJsonTest(unittest.TestCase):
>                 result = self._json_for('test_is_test_passed-no_tests_run_with_header.log')
>                 self.assertEqual(0, len(result['sub_groups']))
>
> +       def test_nested_json(self):
> +               result = self._json_for('test_is_test_passed-all_passed_nested.log')
> +               self.assertEqual(
> +                       {'name': 'example_simple_test', 'status': 'PASS'},
> +                       result["sub_groups"][0]["sub_groups"][0]["test_cases"][0])
> +
>  class StrContains(str):
>         def __eq__(self, other):
>                 return self in other
> @@ -380,7 +434,7 @@ class KUnitMainTest(unittest.TestCase):
>                 self.assertEqual(e.exception.code, 1)
>                 self.assertEqual(self.linux_source_mock.build_reconfig.call_count, 1)
>                 self.assertEqual(self.linux_source_mock.run_kernel.call_count, 1)
> -               self.print_mock.assert_any_call(StrContains(' 0 tests run'))
> +               self.print_mock.assert_any_call(StrContains('invalid KTAP input!'))
>
>         def test_exec_raw_output(self):
>                 self.linux_source_mock.run_kernel = mock.Mock(return_value=[])
> @@ -388,7 +442,7 @@ class KUnitMainTest(unittest.TestCase):
>                 self.assertEqual(self.linux_source_mock.run_kernel.call_count, 1)
>                 for call in self.print_mock.call_args_list:
>                         self.assertNotEqual(call, mock.call(StrContains('Testing complete.')))
> -                       self.assertNotEqual(call, mock.call(StrContains(' 0 tests run')))
> +                       self.assertNotEqual(call, mock.call(StrContains(' 0 tests run!')))
>
>         def test_run_raw_output(self):
>                 self.linux_source_mock.run_kernel = mock.Mock(return_value=[])
> @@ -397,7 +451,7 @@ class KUnitMainTest(unittest.TestCase):
>                 self.assertEqual(self.linux_source_mock.run_kernel.call_count, 1)
>                 for call in self.print_mock.call_args_list:
>                         self.assertNotEqual(call, mock.call(StrContains('Testing complete.')))
> -                       self.assertNotEqual(call, mock.call(StrContains(' 0 tests run')))
> +                       self.assertNotEqual(call, mock.call(StrContains(' 0 tests run!')))
>
>         def test_run_raw_output_kunit(self):
>                 self.linux_source_mock.run_kernel = mock.Mock(return_value=[])
> diff --git a/tools/testing/kunit/test_data/test_is_test_passed-all_passed_nested.log b/tools/testing/kunit/test_data/test_is_test_passed-all_passed_nested.log
> new file mode 100644
> index 000000000000..9d5b04fe43a6
> --- /dev/null
> +++ b/tools/testing/kunit/test_data/test_is_test_passed-all_passed_nested.log
> @@ -0,0 +1,34 @@
> +TAP version 14
> +1..2
> +       # Subtest: sysctl_test
> +       1..4
> +       # sysctl_test_dointvec_null_tbl_data: sysctl_test_dointvec_null_tbl_data passed
> +       ok 1 - sysctl_test_dointvec_null_tbl_data
> +               # Subtest: example
> +               1..2
> +       init_suite
> +               # example_simple_test: initializing
> +               # example_simple_test: example_simple_test passed
> +               ok 1 - example_simple_test
> +               # example_mock_test: initializing
> +               # example_mock_test: example_mock_test passed
> +               ok 2 - example_mock_test
> +       kunit example: all tests passed
> +       ok 2 - example
> +       # sysctl_test_dointvec_table_len_is_zero: sysctl_test_dointvec_table_len_is_zero passed
> +       ok 3 - sysctl_test_dointvec_table_len_is_zero
> +       # sysctl_test_dointvec_table_read_but_position_set: sysctl_test_dointvec_table_read_but_position_set passed
> +       ok 4 - sysctl_test_dointvec_table_read_but_position_set
> +kunit sysctl_test: all tests passed
> +ok 1 - sysctl_test
> +       # Subtest: example
> +       1..2
> +init_suite
> +       # example_simple_test: initializing
> +       # example_simple_test: example_simple_test passed
> +       ok 1 - example_simple_test
> +       # example_mock_test: initializing
> +       # example_mock_test: example_mock_test passed
> +       ok 2 - example_mock_test
> +kunit example: all tests passed
> +ok 2 - example
> diff --git a/tools/testing/kunit/test_data/test_is_test_passed-kselftest.log b/tools/testing/kunit/test_data/test_is_test_passed-kselftest.log
> new file mode 100644
> index 000000000000..65d3f27feaf2
> --- /dev/null
> +++ b/tools/testing/kunit/test_data/test_is_test_passed-kselftest.log
> @@ -0,0 +1,14 @@
> +TAP version 13
> +1..2
> +# selftests: membarrier: membarrier_test_single_thread
> +# TAP version 13
> +# 1..2
> +# ok 1 sys_membarrier available
> +# ok 2 sys membarrier invalid command test: command = -1, flags = 0, errno = 22. Failed as expected
> +ok 1 selftests: membarrier: membarrier_test_single_thread
> +# selftests: membarrier: membarrier_test_multi_thread
> +# TAP version 13
> +# 1..2
> +# ok 1 sys_membarrier available
> +# ok 2 sys membarrier invalid command test: command = -1, flags = 0, errno = 22. Failed as expected
> +ok 2 selftests: membarrier: membarrier_test_multi_thread
> diff --git a/tools/testing/kunit/test_data/test_is_test_passed-missing_plan.log b/tools/testing/kunit/test_data/test_is_test_passed-missing_plan.log
> new file mode 100644
> index 000000000000..5cd17b7f818a
> --- /dev/null
> +++ b/tools/testing/kunit/test_data/test_is_test_passed-missing_plan.log
> @@ -0,0 +1,31 @@
> +KTAP version 1
> +       # Subtest: sysctl_test
> +       # sysctl_test_dointvec_null_tbl_data: sysctl_test_dointvec_null_tbl_data passed
> +       ok 1 - sysctl_test_dointvec_null_tbl_data
> +       # sysctl_test_dointvec_table_maxlen_unset: sysctl_test_dointvec_table_maxlen_unset passed
> +       ok 2 - sysctl_test_dointvec_table_maxlen_unset
> +       # sysctl_test_dointvec_table_len_is_zero: sysctl_test_dointvec_table_len_is_zero passed
> +       ok 3 - sysctl_test_dointvec_table_len_is_zero
> +       # sysctl_test_dointvec_table_read_but_position_set: sysctl_test_dointvec_table_read_but_position_set passed
> +       ok 4 - sysctl_test_dointvec_table_read_but_position_set
> +       # sysctl_test_dointvec_happy_single_positive: sysctl_test_dointvec_happy_single_positive passed
> +       ok 5 - sysctl_test_dointvec_happy_single_positive
> +       # sysctl_test_dointvec_happy_single_negative: sysctl_test_dointvec_happy_single_negative passed
> +       ok 6 - sysctl_test_dointvec_happy_single_negative
> +       # sysctl_test_dointvec_single_less_int_min: sysctl_test_dointvec_single_less_int_min passed
> +       ok 7 - sysctl_test_dointvec_single_less_int_min
> +       # sysctl_test_dointvec_single_greater_int_max: sysctl_test_dointvec_single_greater_int_max passed
> +       ok 8 - sysctl_test_dointvec_single_greater_int_max
> +kunit sysctl_test: all tests passed
> +ok 1 - sysctl_test
> +       # Subtest: example
> +       1..2
> +init_suite
> +       # example_simple_test: initializing
> +       # example_simple_test: example_simple_test passed
> +       ok 1 - example_simple_test
> +       # example_mock_test: initializing
> +       # example_mock_test: example_mock_test passed
> +       ok 2 - example_mock_test
> +kunit example: all tests passed
> +ok 2 - example
> diff --git a/tools/testing/kunit/test_data/test_strip_hyphen.log b/tools/testing/kunit/test_data/test_strip_hyphen.log
> new file mode 100644
> index 000000000000..92ac7c24b374
> --- /dev/null
> +++ b/tools/testing/kunit/test_data/test_strip_hyphen.log
> @@ -0,0 +1,16 @@
> +KTAP version 1
> +1..2
> +       # Subtest: sysctl_test
> +       1..1
> +       # sysctl_test_dointvec_null_tbl_data: sysctl_test_dointvec_null_tbl_data passed
> +       ok 1 - sysctl_test_dointvec_null_tbl_data
> +kunit sysctl_test: all tests passed
> +ok 1 - sysctl_test
> +       # Subtest: example
> +       1..1
> +init_suite
> +       # example_simple_test: initializing
> +       # example_simple_test: example_simple_test passed
> +       ok 1 example_simple_test
> +kunit example: all tests passed
> +ok 2 example
>
> base-commit: 28a8b037484044d79f3b8d409a076a925ac75f8d
> --
> 2.33.0.800.g4c38ced690-goog
>

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