84 lines
2.6 KiB
ReStructuredText
84 lines
2.6 KiB
ReStructuredText
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.. _`accept example`:
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example: specifying and selecting acceptance tests
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--------------------------------------------------------------
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.. sourcecode:: python
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# ./conftest.py
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def pytest_option(parser):
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group = parser.getgroup("myproject")
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group.addoption(
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"-A", dest="acceptance", action="store_true", help="run (slow) acceptance tests"
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)
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def pytest_funcarg__accept(request):
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return AcceptFixture(request)
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class AcceptFixture:
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def __init__(self, request):
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if not request.config.getoption("acceptance"):
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pytest.skip("specify -A to run acceptance tests")
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self.tmpdir = request.config.mktemp(request.function.__name__, numbered=True)
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def run(self, *cmd):
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"""called by test code to execute an acceptance test."""
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self.tmpdir.chdir()
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return subprocess.check_output(cmd).decode()
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and the actual test function example:
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.. sourcecode:: python
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def test_some_acceptance_aspect(accept):
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accept.tmpdir.mkdir("somesub")
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result = accept.run("ls", "-la")
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assert "somesub" in result
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If you run this test without specifying a command line option
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the test will get skipped with an appropriate message. Otherwise
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you can start to add convenience and test support methods
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to your AcceptFixture and drive running of tools or
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applications and provide ways to do assertions about
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the output.
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.. _`decorate a funcarg`:
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example: decorating a funcarg in a test module
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--------------------------------------------------------------
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For larger scale setups it's sometimes useful to decorate
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a funcarg just for a particular test module. We can
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extend the `accept example`_ by putting this in our test module:
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.. sourcecode:: python
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def pytest_funcarg__accept(request):
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# call the next factory (living in our conftest.py)
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arg = request.getfuncargvalue("accept")
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# create a special layout in our tempdir
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arg.tmpdir.mkdir("special")
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return arg
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class TestSpecialAcceptance:
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def test_sometest(self, accept):
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assert accept.tmpdir.join("special").check()
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Our module level factory will be invoked first and it can
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ask its request object to call the next factory and then
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decorate its result. This mechanism allows us to stay
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ignorant of how/where the function argument is provided -
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in our example from a `conftest plugin`_.
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sidenote: the temporary directory used here are instances of
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the `py.path.local`_ class which provides many of the os.path
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methods in a convenient way.
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.. _`py.path.local`: ../path.html#local
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.. _`conftest plugin`: customize.html#conftestplugin
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