"""
Decorators for labeling and modifying behavior of test objects.
Decorators that merely return a modified version of the original
function object are straightforward. Decorators that return a new
function object need to use
::
nose.tools.make_decorator(original_function)(decorator)
in returning the decorator, in order to preserve meta-data such as
function name, setup and teardown functions and so on - see
``nose.tools`` for more information.
"""
import warnings
import sys
from numpy.testing.utils import \
WarningManager, WarningMessage
def slow(t):
"""
Label a test as 'slow'.
The exact definition of a slow test is obviously both subjective and
hardware-dependent, but in general any individual test that requires more
than a second or two should be labeled as slow (the whole suite consits of
thousands of tests, so even a second is significant).
Parameters
----------
t : callable
The test to label as slow.
Returns
-------
t : callable
The decorated test `t`.
Examples
--------
The `numpy.testing` module includes ``import decorators as dec``.
A test can be decorated as slow like this::
from numpy.testing import *
@dec.slow
def test_big(self):
print 'Big, slow test'
"""
t.slow = True
return t
def setastest(tf=True):
"""
Signals to nose that this function is or is not a test.
Parameters
----------
tf : bool
If True, specifies that the decorated callable is a test.
If False, specifies that the decorated callable is not a test.
Default is True.
Notes
-----
This decorator can't use the nose namespace, because it can be
called from a non-test module. See also ``istest`` and ``nottest`` in
``nose.tools``.
Examples
--------
`setastest` can be used in the following way::
from numpy.testing.decorators import setastest
@setastest(False)
def func_with_test_in_name(arg1, arg2):
pass
"""
def set_test(t):
t.__test__ = tf
return t
return set_test
def skipif(skip_condition, msg=None):
"""
Make function raise SkipTest exception if a given condition is true.
If the condition is a callable, it is used at runtime to dynamically
make the decision. This is useful for tests that may require costly
imports, to delay the cost until the test suite is actually executed.
Parameters
----------
skip_condition : bool or callable
Flag to determine whether to skip the decorated test.
msg : str, optional
Message to give on raising a SkipTest exception. Default is None.
Returns
-------
decorator : function
Decorator which, when applied to a function, causes SkipTest
to be raised when `skip_condition` is True, and the function
to be called normally otherwise.
Notes
-----
The decorator itself is decorated with the ``nose.tools.make_decorator``
function in order to transmit function name, and various other metadata.
"""
def skip_decorator(f):
# Local import to avoid a hard nose dependency and only incur the
# import time overhead at actual test-time.
import nose
# Allow for both boolean or callable skip conditions.
if callable(skip_condition):
skip_val = lambda : skip_condition()
else:
skip_val = lambda : skip_condition
def get_msg(func,msg=None):
"""Skip message with information about function being skipped."""
if msg is None:
out = 'Test skipped due to test condition'
else:
out = '\n'+msg
return "Skipping test: %s%s" % (func.__name__,out)
# We need to define *two* skippers because Python doesn't allow both
# return with value and yield inside the same function.
def skipper_func(*args, **kwargs):
"""Skipper for normal test functions."""
if skip_val():
raise nose.SkipTest(get_msg(f,msg))
else:
return f(*args, **kwargs)
def skipper_gen(*args, **kwargs):
"""Skipper for test generators."""
if skip_val():
raise nose.SkipTest(get_msg(f,msg))
else:
for x in f(*args, **kwargs):
yield x
# Choose the right skipper to use when building the actual decorator.
if nose.util.isgenerator(f):
skipper = skipper_gen
else:
skipper = skipper_func
return nose.tools.make_decorator(f)(skipper)
return skip_decorator
def knownfailureif(fail_condition, msg=None):
"""
Make function raise KnownFailureTest exception if given condition is true.
If the condition is a callable, it is used at runtime to dynamically
make the decision. This is useful for tests that may require costly
imports, to delay the cost until the test suite is actually executed.
Parameters
----------
fail_condition : bool or callable
Flag to determine whether to mark the decorated test as a known
failure (if True) or not (if False).
msg : str, optional
Message to give on raising a KnownFailureTest exception.
Default is None.
Returns
-------
decorator : function
Decorator, which, when applied to a function, causes SkipTest
to be raised when `skip_condition` is True, and the function
to be called normally otherwise.
Notes
-----
The decorator itself is decorated with the ``nose.tools.make_decorator``
function in order to transmit function name, and various other metadata.
"""
if msg is None:
msg = 'Test skipped due to known failure'
# Allow for both boolean or callable known failure conditions.
if callable(fail_condition):
fail_val = lambda : fail_condition()
else:
fail_val = lambda : fail_condition
def knownfail_decorator(f):
# Local import to avoid a hard nose dependency and only incur the
# import time overhead at actual test-time.
import nose
from noseclasses import KnownFailureTest
def knownfailer(*args, **kwargs):
if fail_val():
raise KnownFailureTest, msg
else:
return f(*args, **kwargs)
return nose.tools.make_decorator(f)(knownfailer)
return knownfail_decorator
def deprecated(conditional=True):
"""
Filter deprecation warnings while running the test suite.
This decorator can be used to filter DeprecationWarning's, to avoid
printing them during the test suite run, while checking that the test
actually raises a DeprecationWarning.
Parameters
----------
conditional : bool or callable, optional
Flag to determine whether to mark test as deprecated or not. If the
condition is a callable, it is used at runtime to dynamically make the
decision. Default is True.
Returns
-------
decorator : function
The `deprecated` decorator itself.
Notes
-----
.. versionadded:: 1.4.0
"""
def deprecate_decorator(f):
# Local import to avoid a hard nose dependency and only incur the
# import time overhead at actual test-time.
import nose
from noseclasses import KnownFailureTest
def _deprecated_imp(*args, **kwargs):
# Poor man's replacement for the with statement
ctx = WarningManager(record=True)
l = ctx.__enter__()
warnings.simplefilter('always')
try:
f(*args, **kwargs)
if not len(l) > 0:
raise AssertionError("No warning raised when calling %s"
% f.__name__)
if not l[0].category is DeprecationWarning:
raise AssertionError("First warning for %s is not a " \
"DeprecationWarning( is %s)" % (f.__name__, l[0]))
finally:
ctx.__exit__()
if callable(conditional):
cond = conditional()
else:
cond = conditional
if cond:
return nose.tools.make_decorator(f)(_deprecated_imp)
else:
return f
return deprecate_decorator
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