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Fix 'test grouping by fixture instances' doc example 

The fin() function was never added as a finalizer and did therefore not print
anything in the captured output.

In general improve the output by making it more verbose/explicit and extend the
final explanation.
This commit is contained in:
Omar Kohl 2016-03-20 15:53:32 +01:00
parent dff914cadd
commit f70ed83479
1 changed files with 63 additions and 33 deletions
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96
doc/en/fixture.rst
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@ -585,55 +585,85 @@ to show the setup/teardown flow::
@pytest.fixture(scope="module", params=["mod1", "mod2"])
def modarg(request):
param = request.param
print ("create", param)
print (" SETUP modarg %s" % param)
def fin():
print ("fin %s" % param)
print (" TEARDOWN modarg %s" % param)
request.addfinalizer(fin)
return param
@pytest.fixture(scope="function", params=[1,2])
def otherarg(request):
return request.param
param = request.param
print (" SETUP otherarg %s" % param)
def fin():
print (" TEARDOWN otherarg %s" % param)
request.addfinalizer(fin)
return param
def test_0(otherarg):
print (" test0", otherarg)
print (" RUN test0 with otherarg %s" % otherarg)
def test_1(modarg):
print (" test1", modarg)
print (" RUN test1 with modarg %s" % modarg)
def test_2(otherarg, modarg):
print (" test2", otherarg, modarg)
print (" RUN test2 with otherarg %s and modarg %s" % (otherarg, modarg))
Let's run the tests in verbose mode and with looking at the print-output::
$ py.test -v -s test_module.py
======= test session starts ========
platform linux -- Python 3.4.0, pytest-2.9.1, py-1.4.31, pluggy-0.3.1 -- $PYTHON_PREFIX/bin/python3.4
====== test session starts ======
platform linux -- Python 3.4.3+, pytest-2.9.1, py-1.4.31, pluggy-0.3.1 -- $PYTHON_PREFIX/bin/python3
cachedir: .cache
rootdir: $REGENDOC_TMPDIR, inifile:
collecting ... collected 8 items
test_module.py::test_0[1] test0 1
PASSED
test_module.py::test_0[2] test0 2
PASSED
test_module.py::test_1[mod1] create mod1
test1 mod1
PASSED
test_module.py::test_2[1-mod1] test2 1 mod1
PASSED
test_module.py::test_2[2-mod1] test2 2 mod1
PASSED
test_module.py::test_1[mod2] create mod2
test1 mod2
PASSED
test_module.py::test_2[1-mod2] test2 1 mod2
PASSED
test_module.py::test_2[2-mod2] test2 2 mod2
PASSED
======= 8 passed in 0.12 seconds ========
collected 8 items
You can see that the parametrized module-scoped ``modarg`` resource caused
an ordering of test execution that lead to the fewest possible "active" resources. The finalizer for the ``mod1`` parametrized resource was executed
before the ``mod2`` resource was setup.
test_module.py::test_0[1] SETUP otherarg 1
RUN test0 with otherarg 1
PASSED TEARDOWN otherarg 1
test_module.py::test_0[2] SETUP otherarg 2
RUN test0 with otherarg 2
PASSED TEARDOWN otherarg 2
test_module.py::test_1[mod1] SETUP modarg mod1
RUN test1 with modarg mod1
PASSED
test_module.py::test_2[1-mod1] SETUP otherarg 1
RUN test2 with otherarg 1 and modarg mod1
PASSED TEARDOWN otherarg 1
test_module.py::test_2[2-mod1] SETUP otherarg 2
RUN test2 with otherarg 2 and modarg mod1
PASSED TEARDOWN otherarg 2
test_module.py::test_1[mod2] TEARDOWN modarg mod1
SETUP modarg mod2
RUN test1 with modarg mod2
PASSED
test_module.py::test_2[1-mod2] SETUP otherarg 1
RUN test2 with otherarg 1 and modarg mod2
PASSED TEARDOWN otherarg 1
test_module.py::test_2[2-mod2] SETUP otherarg 2
RUN test2 with otherarg 2 and modarg mod2
PASSED TEARDOWN otherarg 2
TEARDOWN modarg mod2
====== 8 passed in 0.01 seconds ======
You can see that the parametrized module-scoped ``modarg`` resource caused an
ordering of test execution that lead to the fewest possible "active" resources.
The finalizer for the ``mod1`` parametrized resource was executed before the
``mod2`` resource was setup.
In particular notice that test_0 is completely independent and finishes first.
Then test_1 is executed with ``mod1``, then test_2 with ``mod1``, then test_1
with ``mod2`` and finally test_2 with ``mod2``.
The ``otherarg`` parametrized resource (having function scope) was set up before
and teared down after every test that used it.
.. _`usefixtures`: