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230 lines
11 KiB
Markdown
230 lines
11 KiB
Markdown
---
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layout: doc
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title: Automated Tests
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permalink: /doc/automated-tests/
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redirect_from:
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- /en/doc/automated-tests/
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- /doc/AutomatedTests/
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---
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Automated Tests
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===============
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Unit and Integration Tests
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--------------------------
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Starting with Qubes R3 we use [python unittest][unittest] to perform automatic tests of Qubes OS.
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Despite the name, we use it for both [unit tests](https://en.wikipedia.org/wiki/Unit_tests) and [integration tests](https://en.wikipedia.org/wiki/Integration_tests).
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The main purpose is, of course, to deliver much more stable releases.
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Integration tests are written with the assumption that they will be called on dedicated hardware.
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**Do not run these tests on installations with important data, because you might lose it.**
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Since these tests were written with this expectation, all the VMs with a name starting with `test-` on the installation are removed during the process, and all the tests are recklessly started from dom0, even when testing VM components.
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Most of the tests are stored in the [core-admin repository](https://github.com/QubesOS/qubes-core-admin/tree/master/qubes/tests) in the `tests` directory.
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To start them you can use standard python unittest runner:
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python -m unittest -v qubes.tests
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Or our custom one:
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python -m qubes.tests.run -v
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Our test runner runs mostly the same as the standard one, but it has some nice additional features like color output and not needing the "qubes.test" prefix.
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It also has the ability to run lone selected template tests.
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You can use `python -m qubes.tests.run -h` to get usage information:
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[user@dom0 ~]$ python -m qubes.tests.run -h
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usage: run.py [-h] [--verbose] [--quiet] [--list] [--failfast] [--no-failfast]
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[--do-not-clean] [--do-clean] [--loglevel LEVEL]
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[--logfile FILE] [--syslog] [--no-syslog] [--kmsg] [--no-kmsg]
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[TESTNAME [TESTNAME ...]]
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positional arguments:
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TESTNAME list of tests to run named like in description
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(default: run all tests)
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optional arguments:
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-h, --help show this help message and exit
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--verbose, -v increase console verbosity level
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--quiet, -q decrease console verbosity level
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--list, -l list all available tests and exit
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--failfast, -f stop on the first fail, error or unexpected success
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--no-failfast disable --failfast
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--do-not-clean, --dnc, -D
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do not execute tearDown on failed tests. Implies
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--failfast.
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--do-clean, -C do execute tearDown even on failed tests.
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--loglevel LEVEL, -L LEVEL
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logging level for file and syslog forwarding (one of:
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NOTSET, DEBUG, INFO, WARN, WARNING, ERROR, CRITICAL;
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default: DEBUG)
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--logfile FILE, -o FILE
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if set, test run will be also logged to file
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--syslog reenable logging to syslog
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--no-syslog disable logging to syslog
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--kmsg, --very-brave-or-very-stupid
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log most important things to kernel ring-buffer
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--no-kmsg, --i-am-smarter-than-kay-sievers
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do not abuse kernel ring-buffer
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When running only specific tests, write their names like in log, in format:
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MODULE+"/"+CLASS+"/"+FUNCTION. MODULE should omit initial "qubes.tests.".
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Example: basic/TC_00_Basic/test_000_create
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For instance, to run only the tests for the fedora-21 template, you can use the `-l` option, then filter the list:
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[user@dom0 ~]$ python -m qubes.tests.run -l | grep fedora-21
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network/VmNetworking_fedora-21/test_000_simple_networking
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network/VmNetworking_fedora-21/test_010_simple_proxyvm
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network/VmNetworking_fedora-21/test_020_simple_proxyvm_nm
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network/VmNetworking_fedora-21/test_030_firewallvm_firewall
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network/VmNetworking_fedora-21/test_040_inter_vm
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vm_qrexec_gui/TC_00_AppVM_fedora-21/test_000_start_shutdown
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vm_qrexec_gui/TC_00_AppVM_fedora-21/test_010_run_gui_app
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vm_qrexec_gui/TC_00_AppVM_fedora-21/test_050_qrexec_simple_eof
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vm_qrexec_gui/TC_00_AppVM_fedora-21/test_051_qrexec_simple_eof_reverse
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vm_qrexec_gui/TC_00_AppVM_fedora-21/test_052_qrexec_vm_service_eof
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vm_qrexec_gui/TC_00_AppVM_fedora-21/test_053_qrexec_vm_service_eof_reverse
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vm_qrexec_gui/TC_00_AppVM_fedora-21/test_060_qrexec_exit_code_dom0
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vm_qrexec_gui/TC_00_AppVM_fedora-21/test_065_qrexec_exit_code_vm
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vm_qrexec_gui/TC_00_AppVM_fedora-21/test_100_qrexec_filecopy
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vm_qrexec_gui/TC_00_AppVM_fedora-21/test_110_qrexec_filecopy_deny
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vm_qrexec_gui/TC_00_AppVM_fedora-21/test_120_qrexec_filecopy_self
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vm_qrexec_gui/TC_20_DispVM_fedora-21/test_000_prepare_dvm
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vm_qrexec_gui/TC_20_DispVM_fedora-21/test_010_simple_dvm_run
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vm_qrexec_gui/TC_20_DispVM_fedora-21/test_020_gui_app
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vm_qrexec_gui/TC_20_DispVM_fedora-21/test_030_edit_file
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[user@dom0 ~]$ python -m qubes.tests.run -v `python -m qubes.tests.run -l | grep fedora-21`
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Example test run:
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### Qubes 4.0
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Tests on Qubes 4.0 require stopping `qubesd` service first, because special instance of it is started as part of the test run.
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Additionally, tests needs to be started as root. The full command to run the tests is:
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sudo systemctl stop qubesd; sudo -E python3 -m qubes.tests.run -v ; sudo systemctl start qubesd
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On Qubes 4.0 tests are also compatible with nose2 test runner, so you can use this instead:
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sudo systemctl stop qubesd; sudo -E nose2 -v --plugin nose2.plugins.loader.loadtests qubes.tests; sudo systemctl start qubesd
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This may be especially useful together with various nose2 plugins to store tests results (for example `nose2.plugins.junitxml`), to ease presenting results. This is what we use on [OpenQA].
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### Tests configuration
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Test run can be altered using environment variables:
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- `DEFAULT_LVM_POOL` - LVM thin pool to use for tests, in `VolumeGroup/ThinPool` format
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- `QUBES_TEST_PCIDEV` - PCI device to be used in PCI passthrough tests (for example sound card)
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- `QUBES_TEST_TEMPLATES` - space separated list of templates to run tests on; if not set, all installed templates are tested
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- `QUBES_TEST_LOAD_ALL` - load all tests (including tests for all templates) when relevant test modules are imported; this needs to be set for test runners not supporting [load_tests protocol](https://docs.python.org/3/library/unittest.html#load-tests-protocol)
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### Adding a new test to core-admin
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After adding a new unit test to [core-admin/tests](https://github.com/QubesOS/qubes-core-admin/tree/master/tests) you'll have to make sure of two things:
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1. That the test will be added to the RPM file created by [QubesBuilder](/doc/qubes-builder/). For this you need to edit the [core-admin/tests/Makefile](https://github.com/QubesOS/qubes-core-admin/tree/master/tests/Makefile)
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2. That the test will be loaded by [core-admin/tests/\_\_init\_\_.py](https://github.com/QubesOS/qubes-core-admin/tree/master/tests/__init__.py)
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#### Editing the Makefile
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To add your tests, you must append these two lines to the end of the makefile, which will copy your test and its compiled version to the right directory in the RPM file.
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If your test is `example.py`, the appended lines would be:
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cp example.py $(DESTDIR)$(PYTHON_TESTSPATH)
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cp example.py[co] $(DESTDIR)$(PYTHON_TESTSPATH)
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#### Editing `__init__.py`
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You'll also need to add your test at the bottom of the `__init__.py` file, in the method `def load_tests`, in the for loop with `modname`.
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Again, given the hypothetical `example.py` test:
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~~~python
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for modname in (
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'qubes.tests.basic',
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'qubes.tests.dom0_update',
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'qubes.tests.network',
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'qubes.tests.vm_qrexec_gui',
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'qubes.tests.backup',
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'qubes.tests.backupcompatibility',
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'qubes.tests.regressions',
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'qubes.tests.example', # This is our newly added test
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):
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~~~
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### Testing PyQt applications
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When testing (Py)QT application, it's useful to create separate QApplication object for each test.
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But QT framework does not allow to have multiple QApplication objects in the same process at the same time.
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This means it's critical to reliably cleanup previous instance before creating the new one.
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This turns out to be non-trivial task, especially if _any_ test uses event loop.
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Failure to perform proper cleanup in many cases results in SEGV.
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Below you can find steps for the proper cleanup:
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~~~python
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import asyncio
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import quamash
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import unittest
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import gc
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class SomeTestCase(unittest.TestCase):
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def setUp(self):
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[...]
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# force "cleanlooks" style, the default one on Xfce (GtkStyle) use
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# static variable internally and caches pointers to later destroyed
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# objects (result: SEGV)
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self.qtapp = QtGui.QApplication(["test", "-style", "cleanlooks"])
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# construct event loop even if this particular test doesn't use it,
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# otherwise events with qtapp references will be queued there anyway and the
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# first test that actually use event loop will try to dereference (already
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# destroyed) objects, resulting in SEGV
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self.loop = quamash.QEventLoop(self.qtapp)
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def tearDown(self):
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[...]
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# process any pending events before destroying the object
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self.qtapp.processEvents()
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# queue destroying the QApplication object, do that for any other QT
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# related objects here too
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self.qtapp.deleteLater()
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# process any pending events (other than just queued destroy), just in case
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self.qtapp.processEvents()
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# execute main loop, which will process all events, _including just queued destroy_
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self.loop.run_until_complete(asyncio.sleep(0))
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# at this point it QT objects are destroyed, cleanup all remaining references;
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# del other QT object here too
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self.loop.close()
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del self.qtapp
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del self.loop
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gc.collect()
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~~~
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Installation Tests with openQA
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------------------------------
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**URL:** <https://openqa.qubes-os.org/>
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**Tests:** <https://github.com/marmarek/openqa-tests-qubesos>
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Manually testing the installation of Qubes OS is a time-consuming process.
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We use [openQA] to automate this process.
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It works by installing Qubes in KVM and interacting with it as a user would, including simulating mouse clicks and keyboard presses.
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Then, it checks the output to see whether various tests were passed, e.g., by comparing the virtual screen output to screenshots of a successful installation.
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Using openQA to automatically test the Qubes installation process works as of Qubes 4.0-rc4 on 2018-01-26, provided that the versions of KVM and QEMU are new enough and the hardware has VT-x and EPT.
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KVM also supports nested virtualization, so HVM should theoretically work.
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In practice, however, either Xen or QEMU crashes when this is attempted.
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Nonetheless, PV works well, which is sufficient for automated installation testing.
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Thanks to an anonymous donor, our openQA system is hosted in a datacenter on hardware that meets these requirements.
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[unittest]: https://docs.python.org/2/library/unittest.html
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[OpenQA]: http://open.qa/
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