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: 10925709 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 6C88B17E6 for ; Wed, 1 May 2019 23:02:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5A5AE28F65 for ; Wed, 1 May 2019 23:02:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4CFF628F84; Wed, 1 May 2019 23:02:14 +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=-2.7 required=2.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id D62FB28F7F for ; Wed, 1 May 2019 23:02:13 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 7313F21A07096; Wed, 1 May 2019 16:02:13 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=2607:f8b0:4864:20::e49; helo=mail-vs1-xe49.google.com; envelope-from=3csxkxa4kdnaxd09zw9342249e2aa270.ya8749gj-9hz48874efe.mn.ad2@flex--brendanhiggins.bounces.google.com; receiver=linux-nvdimm@lists.01.org Received: from mail-vs1-xe49.google.com (mail-vs1-xe49.google.com [IPv6:2607:f8b0:4864:20::e49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id C1C1F211EB2BF for ; Wed, 1 May 2019 16:02:11 -0700 (PDT) Received: by mail-vs1-xe49.google.com with SMTP id j26so30977vso.20 for ; Wed, 01 May 2019 16:02:11 -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=ZNkVu5bcY9dJtCp5hxHWbAJiFqICp4rMrIXe4VEfu5qQ/Ygz9qKaBixMFfko27RhcT ihfhMDMcIh1zFjIr87pKo8eej48hWpXUS3/p7pvXp6U9KryBChOwzyCSSWJHbmGkXVVK splIpk1w4o/91ftV3sFfnJadJcScjgH3Hf3EF+XlFqsZvFPirfGV5kfm6kuL4wRNy5Gk zpNN69/mt4YOMCqWaNVpZrC0VvtDgTUXG/S/EaM2ZuS4fF8bktWOiuaic+JxmQQLs5kc iAa4mf2/o23IfghG9g/Hyh9WXGY1WhXei8SMX3d/fby69A/fZ9Pj481Q8dZjo3yipHmv 1IfA== X-Gm-Message-State: APjAAAX79b1ftILIAiFf9nPcf/8cLzTaDL29hn9mQ4SA9ezHpgM03MkJ k6bFiekOsqM8JWgCxHdSmXINSZ/LLJRPRdxAqm89GQ== 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 X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pmladek@suse.com, linux-doc@vger.kernel.org, amir73il@gmail.com, Brendan Higgins , dri-devel@lists.freedesktop.org, Alexander.Levin@microsoft.com, linux-kselftest@vger.kernel.org, linux-nvdimm@lists.01.org, khilman@baylibre.com, knut.omang@oracle.com, wfg@linux.intel.com, joel@jms.id.au, rientjes@google.com, jdike@addtoit.com, dan.carpenter@oracle.com, devicetree@vger.kernel.org, linux-kbuild@vger.kernel.org, Tim.Bird@sony.com, linux-um@lists.infradead.org, rostedt@goodmis.org, julia.lawall@lip6.fr, kunit-dev@googlegroups.com, richard@nod.at, linux-kernel@vger.kernel.org, daniel@ffwll.ch, mpe@ellerman.id.au, linux-fsdevel@vger.kernel.org Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" 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