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.. _xunitsetup:
====================================
Extended xUnit style setup fixtures
====================================
.. _`funcargs`: funcargs.html
.. _`test parametrization`: funcargs.html#parametrizing-tests
.. _`unittest plugin`: plugin/unittest.html
.. _`xUnit`: http://en.wikipedia.org/wiki/XUnit
Python, Java and many other languages support xUnit_ style testing.
This typically involves the call of a ``setup`` ("fixture") method
before running a test function and ``teardown`` after it has finished.
``py.test`` supports a more fine-grained model of setup/teardown
handling by optionally calling per-module and per-class hooks.
Module level setup/teardown
=============================================
If you have multiple test functions and test classes in a single
module you can optionally implement the following fixture methods
which will usually be called once for all the functions::
def setup_module(module):
""" setup any state specific to the execution of the given module."""
def teardown_module(module):
""" teardown any state that was previously setup with a setup_module
method.
"""
Class level setup/teardown
=============================================
Similarly, the following methods are called at class level before
and after all test methods of the class are called::
@classmethod
def setup_class(cls):
""" setup any state specific to the execution of the given class (which
usually contains tests).
"""
@classmethod
def teardown_class(cls):
""" teardown any state that was previously setup with a call to
setup_class.
"""
Method and function level setup/teardown
=============================================
Similarly, the following methods are called around each method invocation::
def setup_method(self, method):
""" setup any state tied to the execution of the given method in a
class. setup_method is invoked for every test method of a class.
"""
def teardown_method(self, method):
""" teardown any state that was previously setup with a setup_method
call.
"""
If you would rather define test functions directly at module level
you can also use the following functions to implement fixtures::
def setup_function(function):
""" setup any state tied to the execution of the given function.
Invoked for every test function in the module.
"""
def teardown_function(function):
""" teardown any state that was previously setup with a setup_function
call.
"""
Note that it is possible for setup/teardown pairs to be invoked multiple times
per testing process.
.. _`unittest.py module`: http://docs.python.org/library/unittest.html
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