From patchwork Wed May 1 23:01:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brendan Higgins X-Patchwork-Id: 10925715 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CFF94933 for ; Wed, 1 May 2019 23:02:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C12AB28F63 for ; Wed, 1 May 2019 23:02:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B3E0228F6A; Wed, 1 May 2019 23:02:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 479E128F63 for ; Wed, 1 May 2019 23:02:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726175AbfEAXCL (ORCPT ); Wed, 1 May 2019 19:02:11 -0400 Received: from mail-vk1-f202.google.com ([209.85.221.202]:53587 "EHLO mail-vk1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726133AbfEAXCL (ORCPT ); Wed, 1 May 2019 19:02:11 -0400 Received: by mail-vk1-f202.google.com with SMTP id g12so241934vkf.20 for ; Wed, 01 May 2019 16:02:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=De7JrG6+3XL344zZMScSqunmKbgZceVjMJC0FL9AbxY=; b=qtzfVeePMbJhJqE+Yf+Kv1DhoZE9ng7nvFaWF8RJXgdCikBdWv36SI916RGwYzUukq xZ9iRq7CanllZWM7N5EMvSrH76h/QHHPUoEYCnmM+oUL1rzrZdP/C9kf6bQfkkH2oii8 V97WCJiEG/EbkMT96CrHZ3ULLAQCRx09BXRHAZU8A+nmmtZPD4qqi9tcI9XX7ENyOW6Q pByKUepLMJrt85M4mkzTyPvyDYRRbm2pwYxrVTb6Gm/Oqz+saBFL/hmmcJKeXHcDy2/O 6eNpA52lwMEF/MP27yaxHbVokdjjs1RKVkQH0OPZY00rCv9fgG3G1mGLf74KJ8HBy8CY U+lw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=De7JrG6+3XL344zZMScSqunmKbgZceVjMJC0FL9AbxY=; b=X/ayXKQyyrTH0hu0j/q8Bq2jIvD4aDV8ZJImr/GOmx8mdFfXkuqU2rVIPRzPbXleDA TmBe3fuIvhJXkGr2BoGPzFSd1Qba70NwDqmQMEWe5qFRquBE97myyzV4YdiLwdAMMQQf BZEZ5NhwcEVlAElEAnW9vlJfNW0TlzpWl/CtpCxDXBJEFNHcD0yhb7d07tqOsyQuMDIs PYmB4nMXx+UUP/VOTBL/U+zinW8K/slhpOdF+jGObZA3Kc/b1CEcjhRZgA1ZKbFq9IlC S7nGgk+z+lsu+HQ3el5agh2Fmaj3PdZSSbmJRg1caXRlIcIetzRBK0mPbQD+TasJZ48t a7+g== X-Gm-Message-State: APjAAAVsUFgbVIBgr40fh/lVa2VPDJGMRaSrB2O9kczeJz0EZIYdHgID Yl8/eFmHEhjylUS1BnWjG6NK74FgzvOSH6j5lGq48w== X-Google-Smtp-Source: APXvYqytaGaXIlQSl5wsYvREjZvXVeqTJ4FhNvP2xNvz38NyshdL0U4pqVOMRR/ps0I6/FLnggB5b5wmfrnXtO1aUnE0lA== X-Received: by 2002:ab0:20a1:: with SMTP id y1mr213208ual.101.1556751729917; Wed, 01 May 2019 16:02:09 -0700 (PDT) Date: Wed, 1 May 2019 16:01:09 -0700 Message-Id: <20190501230126.229218-1-brendanhiggins@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.21.0.593.g511ec345e18-goog Subject: [PATCH v2 00/17] kunit: introduce KUnit, the Linux kernel unit testing framework From: Brendan Higgins To: frowand.list@gmail.com, gregkh@linuxfoundation.org, keescook@google.com, kieran.bingham@ideasonboard.com, mcgrof@kernel.org, robh@kernel.org, sboyd@kernel.org, shuah@kernel.org Cc: devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, kunit-dev@googlegroups.com, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-nvdimm@lists.01.org, linux-um@lists.infradead.org, Alexander.Levin@microsoft.com, Tim.Bird@sony.com, amir73il@gmail.com, dan.carpenter@oracle.com, dan.j.williams@intel.com, daniel@ffwll.ch, jdike@addtoit.com, joel@jms.id.au, julia.lawall@lip6.fr, khilman@baylibre.com, knut.omang@oracle.com, logang@deltatee.com, mpe@ellerman.id.au, pmladek@suse.com, richard@nod.at, rientjes@google.com, rostedt@goodmis.org, wfg@linux.intel.com, Brendan Higgins Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP ## 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. Reviewed-by: Greg Kroah-Hartman Reviewed-by: Logan Gunthorpe