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From 687a123ab2165fa3adf9e3469577c22008125270 Mon Sep 17 00:00:00 2001
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From: Yash Mankad <ymankad@redhat.com>
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Date: Wed, 12 Dec 2018 00:14:35 +0000
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Subject: [PATCH 07/13] Add functional/acceptance tests infrastructure
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Yash Mankad <ymankad@redhat.com>
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Message-id: <b1ac81d7ccd9e43f36a74dc6a008974484508c7f.1544573601.git.ymankad@redhat.com>
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Patchwork-id: 83432
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O-Subject: [RHEL-8.0 qemu-kvm PATCH v2 1/7] Add functional/acceptance tests infrastructure
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Bugzilla: 1655807
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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From: Cleber Rosa <crosa@redhat.com>
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This patch adds the very minimum infrastructure necessary for writing
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and running functional/acceptance tests, including:
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 * Documentation
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 * The avocado_qemu.Test base test class
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 * One example tests (version.py)
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Additional functionality is expected to be added along the tests that
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require them.
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Signed-off-by: Cleber Rosa <crosa@redhat.com>
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Message-Id: <20180530184156.15634-2-crosa@redhat.com>
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Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
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Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
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[ehabkost: fix typo on testing.rst]
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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(cherry picked from commit c3d7e8c90db208b1d876f8d6458c2dfca169137f)
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Signed-off-by: Yash Mankad <ymankad@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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 docs/devel/testing.rst                    | 192 ++++++++++++++++++++++++++++++
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 tests/acceptance/README.rst               |  10 ++
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 tests/acceptance/avocado_qemu/__init__.py |  54 +++++++++
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 tests/acceptance/version.py               |  24 ++++
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 4 files changed, 280 insertions(+)
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 create mode 100644 tests/acceptance/README.rst
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 create mode 100644 tests/acceptance/avocado_qemu/__init__.py
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 create mode 100644 tests/acceptance/version.py
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diff --git a/docs/devel/testing.rst b/docs/devel/testing.rst
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index 0ca1a2d..f33e5a8 100644
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--- a/docs/devel/testing.rst
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+++ b/docs/devel/testing.rst
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@@ -484,3 +484,195 @@ supported. To start the fuzzer, run
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 Alternatively, some command different from "qemu-img info" can be tested, by
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 changing the ``-c`` option.
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+
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+Acceptance tests using the Avocado Framework
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+============================================
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+
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+The ``tests/acceptance`` directory hosts functional tests, also known
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+as acceptance level tests.  They're usually higher level tests, and
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+may interact with external resources and with various guest operating
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+systems.
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+
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+These tests are written using the Avocado Testing Framework (which must
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+be installed separately) in conjunction with a the ``avocado_qemu.Test``
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+class, implemented at ``tests/acceptance/avocado_qemu``.
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+
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+Tests based on ``avocado_qemu.Test`` can easily:
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+
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+ * Customize the command line arguments given to the convenience
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+   ``self.vm`` attribute (a QEMUMachine instance)
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+
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+ * Interact with the QEMU monitor, send QMP commands and check
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+   their results
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+
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+ * Interact with the guest OS, using the convenience console device
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+   (which may be useful to assert the effectiveness and correctness of
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+   command line arguments or QMP commands)
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+
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+ * Interact with external data files that accompany the test itself
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+   (see ``self.get_data()``)
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+
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+ * Download (and cache) remote data files, such as firmware and kernel
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+   images
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+
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+ * Have access to a library of guest OS images (by means of the
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+   ``avocado.utils.vmimage`` library)
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+
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+ * Make use of various other test related utilities available at the
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+   test class itself and at the utility library:
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+
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+   - http://avocado-framework.readthedocs.io/en/latest/api/test/avocado.html#avocado.Test
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+   - http://avocado-framework.readthedocs.io/en/latest/api/utils/avocado.utils.html
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+
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+Installation
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+------------
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+
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+To install Avocado and its dependencies, run:
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+
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+.. code::
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+
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+  pip install --user avocado-framework
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+
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+Alternatively, follow the instructions on this link:
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+
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+  http://avocado-framework.readthedocs.io/en/latest/GetStartedGuide.html#installing-avocado
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+
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+Overview
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+--------
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+
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+This directory provides the ``avocado_qemu`` Python module, containing
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+the ``avocado_qemu.Test`` class.  Here's a simple usage example:
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+
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+.. code::
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+
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+  from avocado_qemu import Test
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+
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+
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+  class Version(Test):
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+      """
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+      :avocado: enable
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+      :avocado: tags=quick
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+      """
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+      def test_qmp_human_info_version(self):
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+          self.vm.launch()
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+          res = self.vm.command('human-monitor-command',
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+                                command_line='info version')
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+          self.assertRegexpMatches(res, r'^(\d+\.\d+\.\d)')
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+
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+To execute your test, run:
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+
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+.. code::
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+
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+  avocado run version.py
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+
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+Tests may be classified according to a convention by using docstring
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+directives such as ``:avocado: tags=TAG1,TAG2``.  To run all tests
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+in the current directory, tagged as "quick", run:
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+
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+.. code::
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+
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+  avocado run -t quick .
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+
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+The ``avocado_qemu.Test`` base test class
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+-----------------------------------------
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+
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+The ``avocado_qemu.Test`` class has a number of characteristics that
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+are worth being mentioned right away.
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+
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+First of all, it attempts to give each test a ready to use QEMUMachine
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+instance, available at ``self.vm``.  Because many tests will tweak the
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+QEMU command line, launching the QEMUMachine (by using ``self.vm.launch()``)
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+is left to the test writer.
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+
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+At test "tear down", ``avocado_qemu.Test`` handles the QEMUMachine
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+shutdown.
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+
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+QEMUMachine
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+~~~~~~~~~~~
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+
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+The QEMUMachine API is already widely used in the Python iotests,
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+device-crash-test and other Python scripts.  It's a wrapper around the
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+execution of a QEMU binary, giving its users:
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+
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+ * the ability to set command line arguments to be given to the QEMU
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+   binary
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+
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+ * a ready to use QMP connection and interface, which can be used to
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+   send commands and inspect its results, as well as asynchronous
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+   events
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+
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+ * convenience methods to set commonly used command line arguments in
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+   a more succinct and intuitive way
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+
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+QEMU binary selection
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+~~~~~~~~~~~~~~~~~~~~~
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+
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+The QEMU binary used for the ``self.vm`` QEMUMachine instance will
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+primarily depend on the value of the ``qemu_bin`` parameter.  If it's
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+not explicitly set, its default value will be the result of a dynamic
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+probe in the same source tree.  A suitable binary will be one that
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+targets the architecture matching host machine.
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+
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+Based on this description, test writers will usually rely on one of
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+the following approaches:
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+
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+1) Set ``qemu_bin``, and use the given binary
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+
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+2) Do not set ``qemu_bin``, and use a QEMU binary named like
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+   "${arch}-softmmu/qemu-system-${arch}", either in the current
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+   working directory, or in the current source tree.
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+
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+The resulting ``qemu_bin`` value will be preserved in the
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+``avocado_qemu.Test`` as an attribute with the same name.
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+
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+Attribute reference
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+-------------------
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+
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+Besides the attributes and methods that are part of the base
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+``avocado.Test`` class, the following attributes are available on any
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+``avocado_qemu.Test`` instance.
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+
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+vm
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+~~
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+
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+A QEMUMachine instance, initially configured according to the given
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+``qemu_bin`` parameter.
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+
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+qemu_bin
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+~~~~~~~~
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+
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+The preserved value of the ``qemu_bin`` parameter or the result of the
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+dynamic probe for a QEMU binary in the current working directory or
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+source tree.
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+
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+Parameter reference
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+-------------------
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+
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+To understand how Avocado parameters are accessed by tests, and how
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+they can be passed to tests, please refer to::
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+
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+  http://avocado-framework.readthedocs.io/en/latest/WritingTests.html#accessing-test-parameters
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+
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+Parameter values can be easily seen in the log files, and will look
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+like the following:
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+
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+.. code::
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+
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+  PARAMS (key=qemu_bin, path=*, default=x86_64-softmmu/qemu-system-x86_64) => 'x86_64-softmmu/qemu-system-x86_64
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+
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+qemu_bin
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+~~~~~~~~
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+
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+The exact QEMU binary to be used on QEMUMachine.
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+
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+Uninstalling Avocado
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+--------------------
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+
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+If you've followed the installation instructions above, you can easily
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+uninstall Avocado.  Start by listing the packages you have installed::
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+
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+  pip list --user
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+
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+And remove any package you want with::
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+
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+  pip uninstall <package_name>
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diff --git a/tests/acceptance/README.rst b/tests/acceptance/README.rst
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new file mode 100644
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index 0000000..89260fa
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--- /dev/null
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+++ b/tests/acceptance/README.rst
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@@ -0,0 +1,10 @@
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+============================================
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+Acceptance tests using the Avocado Framework
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+============================================
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+
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+This directory contains functional tests, also known as acceptance
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+level tests.  They're usually higher level, and may interact with
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+external resources and with various guest operating systems.
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+
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+For more information, please refer to ``docs/devel/testing.rst``,
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+section "Acceptance tests using the Avocado Framework".
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diff --git a/tests/acceptance/avocado_qemu/__init__.py b/tests/acceptance/avocado_qemu/__init__.py
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new file mode 100644
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index 0000000..1e54fd5
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--- /dev/null
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+++ b/tests/acceptance/avocado_qemu/__init__.py
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@@ -0,0 +1,54 @@
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+# Test class and utilities for functional tests
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+#
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+# Copyright (c) 2018 Red Hat, Inc.
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+#
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+# Author:
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+#  Cleber Rosa <crosa@redhat.com>
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+#
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+# This work is licensed under the terms of the GNU GPL, version 2 or
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+# later.  See the COPYING file in the top-level directory.
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+
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+import os
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+import sys
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+
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+import avocado
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+
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+SRC_ROOT_DIR = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
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+SRC_ROOT_DIR = os.path.abspath(os.path.dirname(SRC_ROOT_DIR))
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+sys.path.append(os.path.join(SRC_ROOT_DIR, 'scripts'))
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+
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+from qemu import QEMUMachine
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+
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+def is_readable_executable_file(path):
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+    return os.path.isfile(path) and os.access(path, os.R_OK | os.X_OK)
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+
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+
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+def pick_default_qemu_bin():
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+    """
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+    Picks the path of a QEMU binary, starting either in the current working
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+    directory or in the source tree root directory.
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+    """
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+    arch = os.uname()[4]
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+    qemu_bin_relative_path = os.path.join("%s-softmmu" % arch,
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+                                          "qemu-system-%s" % arch)
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+    if is_readable_executable_file(qemu_bin_relative_path):
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+        return qemu_bin_relative_path
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+
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+    qemu_bin_from_src_dir_path = os.path.join(SRC_ROOT_DIR,
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+                                              qemu_bin_relative_path)
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+    if is_readable_executable_file(qemu_bin_from_src_dir_path):
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+        return qemu_bin_from_src_dir_path
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+
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+
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+class Test(avocado.Test):
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+    def setUp(self):
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+        self.vm = None
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+        self.qemu_bin = self.params.get('qemu_bin',
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+                                        default=pick_default_qemu_bin())
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+        if self.qemu_bin is None:
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+            self.cancel("No QEMU binary defined or found in the source tree")
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+        self.vm = QEMUMachine(self.qemu_bin)
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+
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+    def tearDown(self):
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+        if self.vm is not None:
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+            self.vm.shutdown()
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diff --git a/tests/acceptance/version.py b/tests/acceptance/version.py
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new file mode 100644
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index 0000000..13b0a74
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--- /dev/null
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+++ b/tests/acceptance/version.py
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@@ -0,0 +1,24 @@
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+# Version check example test
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+#
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+# Copyright (c) 2018 Red Hat, Inc.
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+#
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+# Author:
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+#  Cleber Rosa <crosa@redhat.com>
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+#
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+# This work is licensed under the terms of the GNU GPL, version 2 or
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+# later.  See the COPYING file in the top-level directory.
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+
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+
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+from avocado_qemu import Test
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+
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+
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+class Version(Test):
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+    """
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+    :avocado: enable
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+    :avocado: tags=quick
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+    """
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+    def test_qmp_human_info_version(self):
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+        self.vm.launch()
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+        res = self.vm.command('human-monitor-command',
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+                              command_line='info version')
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+        self.assertRegexpMatches(res, r'^(\d+\.\d+\.\d)')
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-- 
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1.8.3.1
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