linux-kernel - Re: [RFC v3 00/19] kunit: introduce KUnit, the Linux kernel unit testing framework

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Date:   Tue, 4 Dec 2018 02:52:11 -0800
From:   Frank Rowand <frowand.list@...il.com>
To:     Brendan Higgins <brendanhiggins@...gle.com>,
        gregkh@...uxfoundation.org, keescook@...gle.com, mcgrof@...nel.org,
        shuah@...nel.org
Cc:     joel@....id.au, mpe@...erman.id.au, joe@...ches.com, brakmo@...com,
        rostedt@...dmis.org, Tim.Bird@...y.com, khilman@...libre.com,
        julia.lawall@...6.fr, linux-kselftest@...r.kernel.org,
        kunit-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        jdike@...toit.com, richard@....at, linux-um@...ts.infradead.org,
        daniel@...ll.ch, dri-devel@...ts.freedesktop.org, robh@...nel.org,
        dan.j.williams@...el.com, linux-nvdimm@...ts.01.org,
        kieran.bingham@...asonboard.com, knut.omang@...cle.com
Subject: Re: [RFC v3 00/19] kunit: introduce KUnit, the Linux kernel unit
 testing framework

On 11/28/18 11:36 AM, Brendan Higgins wrote:
> This patch set proposes KUnit, a lightweight unit testing and mocking
> framework for the Linux kernel.
> 
> Unlike Autotest and kselftest, KUnit is a true unit testing framework;
> it does not require installing the kernel on a test machine or in a VM
> and does not require tests to be written in userspace running on a host
> kernel. Additionally, KUnit is fast: From invocation to completion KUnit
> can run several dozen tests in under a second. Currently, the entire
> KUnit test suite for KUnit runs in under a second from the initial
> invocation (build time excluded).
> 
> KUnit is heavily inspired by JUnit, Python's unittest.mock, and
> Googletest/Googlemock for C++. KUnit provides facilities for defining
> unit test cases, grouping related test cases into test suites, providing
> common infrastructure for running tests, mocking, spying, and much more.
> 
> ## What's so special about unit testing?
> 


> A unit test is supposed to test a single unit of code in isolation,
> hence the name. There should be no dependencies outside the control of
> the test; this means no external dependencies, which makes tests orders
> of magnitudes faster. Likewise, since there are no external dependencies,
> there are no hoops to jump through to run the tests. Additionally, this

This question might be a misunderstanding of the intent of some of the
terminology in the above paragraph, so this is mostly a request for
clarification.

With my pre-conception of what unit tests are, I read "test a single unit
of code" to mean a relatively narrow piece of a subsystem.  So if I
understand correctly, taking examples from patch 17 "of: unittest:
migrate tests to run on KUnit", each function call like
KUNIT_ASSERT_NOT_ERR_OR_NULL(), KUNIT_EXPECT_STREQ_MSG(), and
KUNIT_EXPECT_EQ_MSG() are each a separate unit test, and thus the
paragraph says that each of these function calls should have no
dependencies outside the test.  Do I understand that correctly?

< snip >

-Frank