On Thu, May 2, 2019 at 8:02 AM Brendan Higgins brendanhiggins@google.com wrote:
## TLDR
I rebased the last patchset on 5.1-rc7 in hopes that we can get this in 5.2.
Shuah, I think you, Greg KH, and myself talked off thread, and we agreed we would merge through your tree when the time came? Am I remembering correctly?
## Background
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 makes unit tests deterministic: a failing unit test always indicates a problem. Finally, because unit tests necessarily have finer granularity, they are able to test all code paths easily solving the classic problem of difficulty in exercising error handling code.
## Is KUnit trying to replace other testing frameworks for the kernel?
No. Most existing tests for the Linux kernel are end-to-end tests, which have their place. A well tested system has lots of unit tests, a reasonable number of integration tests, and some end-to-end tests. KUnit is just trying to address the unit test space which is currently not being addressed.
## More information on KUnit
There is a bunch of documentation near the end of this patch set that describes how to use KUnit and best practices for writing unit tests. For convenience I am hosting the compiled docs here: https://google.github.io/kunit-docs/third_party/kernel/docs/ Additionally for convenience, I have applied these patches to a branch: https://kunit.googlesource.com/linux/+/kunit/rfc/v5.1-rc7/v1 The repo may be cloned with: git clone https://kunit.googlesource.com/linux This patchset is on the kunit/rfc/v5.1-rc7/v1 branch.
## Changes Since Last Version
None. I just rebased the last patchset on v5.1-rc7.
-- 2.21.0.593.g511ec345e18-goog
The following is the log of 'git am' of this series. I see several 'new blank line at EOF' warnings.
masahiro@pug:~/workspace/bsp/linux$ git am ~/Downloads/*.patch Applying: kunit: test: add KUnit test runner core Applying: kunit: test: add test resource management API Applying: kunit: test: add string_stream a std::stream like string builder .git/rebase-apply/patch:223: new blank line at EOF. + warning: 1 line adds whitespace errors. Applying: kunit: test: add kunit_stream a std::stream like logger Applying: kunit: test: add the concept of expectations .git/rebase-apply/patch:475: new blank line at EOF. + warning: 1 line adds whitespace errors. Applying: kbuild: enable building KUnit Applying: kunit: test: add initial tests .git/rebase-apply/patch:203: new blank line at EOF. + warning: 1 line adds whitespace errors. Applying: kunit: test: add support for test abort .git/rebase-apply/patch:453: new blank line at EOF. + warning: 1 line adds whitespace errors. Applying: kunit: test: add tests for kunit test abort Applying: kunit: test: add the concept of assertions .git/rebase-apply/patch:518: new blank line at EOF. + warning: 1 line adds whitespace errors. Applying: kunit: test: add test managed resource tests Applying: kunit: tool: add Python wrappers for running KUnit tests .git/rebase-apply/patch:457: new blank line at EOF. + warning: 1 line adds whitespace errors. Applying: kunit: defconfig: add defconfigs for building KUnit tests Applying: Documentation: kunit: add documentation for KUnit .git/rebase-apply/patch:71: new blank line at EOF. + .git/rebase-apply/patch:209: new blank line at EOF. + .git/rebase-apply/patch:848: new blank line at EOF. + warning: 3 lines add whitespace errors. Applying: MAINTAINERS: add entry for KUnit the unit testing framework Applying: kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec() Applying: MAINTAINERS: add proc sysctl KUnit test to PROC SYSCTL section
-- Best Regards Masahiro Yamada