linux-kernel - [PATCH] kunit: make KUNIT_EXPECT_STREQ() quote values, don't print literals

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Message-Id: <20210205221808.1966010-1-dlatypov@google.com>
Date:   Fri,  5 Feb 2021 14:18:08 -0800
From:   Daniel Latypov <dlatypov@...gle.com>
To:     brendanhiggins@...gle.com, davidgow@...gle.com
Cc:     linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        skhan@...uxfoundation.org, Daniel Latypov <dlatypov@...gle.com>
Subject: [PATCH] kunit: make KUNIT_EXPECT_STREQ() quote values, don't print literals

Before:
>  Expected str == "world", but
>      str == hello
>      "world" == world

After:
>  Expected str == "world", but
>      str == "hello"
<we don't need to tell the user that "world" == "world">

Note: like the literal ellision for integers, this doesn't handle the
case of
  KUNIT_EXPECT_STREQ(test, "hello", "world")
since we don't expect it to realistically happen in checked in tests.
(If you really wanted a test to fail, KUNIT_FAIL("msg") exists)

In that case, you'd get:
>  Expected "hello" == "world", but
<output for next failure>

Signed-off-by: Daniel Latypov <dlatypov@...gle.com>
---
 lib/kunit/assert.c | 30 ++++++++++++++++++++++++------
 1 file changed, 24 insertions(+), 6 deletions(-)

diff --git a/lib/kunit/assert.c b/lib/kunit/assert.c
index e0ec7d6fed6f..176ef547fa94 100644
--- a/lib/kunit/assert.c
+++ b/lib/kunit/assert.c
@@ -156,6 +156,22 @@ void kunit_binary_ptr_assert_format(const struct kunit_assert *assert,
 }
 EXPORT_SYMBOL_GPL(kunit_binary_ptr_assert_format);
 
+/* Checks if KUNIT_EXPECT_STREQ() args were string literals.
+ * Note: `text` will have ""s where as `value` will not.
+ */
+static bool is_str_literal(const char *text, const char *value)
+{
+	int len;
+
+	len = strlen(text);
+	if (len < 2)
+		return false;
+	if (text[0] != '\"' || text[len-1] != '\"')
+		return false;
+
+	return strncmp(text+1, value, len-2) == 0;
+}
+
 void kunit_binary_str_assert_format(const struct kunit_assert *assert,
 				    struct string_stream *stream)
 {
@@ -168,12 +184,14 @@ void kunit_binary_str_assert_format(const struct kunit_assert *assert,
 			  binary_assert->left_text,
 			  binary_assert->operation,
 			  binary_assert->right_text);
-	string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s == %s\n",
-			  binary_assert->left_text,
-			  binary_assert->left_value);
-	string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s == %s",
-			  binary_assert->right_text,
-			  binary_assert->right_value);
+	if (!is_str_literal(binary_assert->left_text, binary_assert->left_value))
+		string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s == \"%s\"\n",
+				  binary_assert->left_text,
+				  binary_assert->left_value);
+	if (!is_str_literal(binary_assert->right_text, binary_assert->right_value))
+		string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s == \"%s\"",
+				  binary_assert->right_text,
+				  binary_assert->right_value);
 	kunit_assert_print_msg(assert, stream);
 }
 EXPORT_SYMBOL_GPL(kunit_binary_str_assert_format);

base-commit: 1e0d27fce010b0a4a9e595506b6ede75934c31be
prerequisite-patch-id: 290f8022f30763cbfb6aec969b038a6f60a57482
-- 
2.30.0.478.g8a0d178c01-goog