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"""
Tools for testing
-----------------
nose.tools provides a few convenience functions to make writing tests
easier. You don't have to use them; nothing in the rest of nose depends
on any of these methods.
"""
import re
import time
import unittest
__all__ = ['ok_', 'eq_', 'make_decorator', 'raises', 'set_trace', 'timed',
'with_setup', 'TimeExpired']
class TimeExpired(AssertionError):
pass
def ok_(expr, msg=None):
"""Shorthand for assert. Saves 3 whole characters!
"""
assert expr, msg
def eq_(a, b, msg=None):
"""Shorthand for 'assert a == b, "%r != %r" % (a, b)
"""
assert a == b, msg or "%r != %r" % (a, b)
def make_decorator(func):
"""
Wraps a test decorator so as to properly replicate metadata
of the decorated function, including nose's additional stuff
(namely, setup and teardown).
"""
def decorate(newfunc):
if hasattr(func, 'compat_func_name'):
name = func.compat_func_name
else:
name = func.__name__
newfunc.__dict__ = func.__dict__
newfunc.__doc__ = func.__doc__
newfunc.__module__ = func.__module__
if not hasattr(newfunc, 'compat_co_firstlineno'):
newfunc.compat_co_firstlineno = func.func_code.co_firstlineno
try:
newfunc.__name__ = name
except TypeError:
# can't set func name in 2.3
newfunc.compat_func_name = name
return newfunc
return decorate
def raises(*exceptions):
"""Test must raise one of expected exceptions to pass.
Example use::
@raises(TypeError, ValueError)
def test_raises_type_error():
raise TypeError("This test passes")
@raises(Exception):
def test_that_fails_by_passing():
pass
If you want to test many assertions about exceptions in a single test,
you may want to use `assert_raises` instead.
"""
valid = ' or '.join([e.__name__ for e in exceptions])
def decorate(func):
name = func.__name__
def newfunc(*arg, **kw):
try:
func(*arg, **kw)
except exceptions:
pass
except:
raise
else:
message = "%s() did not raise %s" % (name, valid)
raise AssertionError(message)
newfunc = make_decorator(func)(newfunc)
return newfunc
return decorate
def set_trace():
"""Call pdb.set_trace in the calling frame, first restoring
sys.stdout to the real output stream. Note that sys.stdout is NOT
reset to whatever it was before the call once pdb is done!
"""
import pdb
import sys
stdout = sys.stdout
sys.stdout = sys.__stdout__
pdb.Pdb().set_trace(sys._getframe().f_back)
def timed(limit):
"""Test must finish within specified time limit to pass.
Example use::
@timed(.1)
def test_that_fails():
time.sleep(.2)
"""
def decorate(func):
def newfunc(*arg, **kw):
start = time.time()
func(*arg, **kw)
end = time.time()
if end - start > limit:
raise TimeExpired("Time limit (%s) exceeded" % limit)
newfunc = make_decorator(func)(newfunc)
return newfunc
return decorate
def with_setup(setup=None, teardown=None):
"""Decorator to add setup and/or teardown methods to a test function::
@with_setup(setup, teardown)
def test_something():
# ...
Note that `with_setup` is useful *only* for test functions, not for test
methods or inside of TestCase subclasses.
"""
def decorate(func, setup=setup, teardown=teardown):
if setup:
if hasattr(func, 'setup'):
_old_s = func.setup
def _s():
setup()
_old_s()
func.setup = _s
else:
func.setup = setup
if teardown:
if hasattr(func, 'teardown'):
_old_t = func.teardown
def _t():
_old_t()
teardown()
func.teardown = _t
else:
func.teardown = teardown
return func
return decorate
def istest(func):
"""Decorator to mark a function or method as a test
"""
func.__test__ = True
return func
def nottest(func):
"""Decorator to mark a function or method as *not* a test
"""
func.__test__ = False
return func
#
# Expose assert* from unittest.TestCase
# - give them pep8 style names
#
caps = re.compile('([A-Z])')
def pep8(name):
return caps.sub(lambda m: '_' + m.groups()[0].lower(), name)
class Dummy(unittest.TestCase):
def nop():
pass
_t = Dummy('nop')
for at in [ at for at in dir(_t)
if at.startswith('assert') and not '_' in at ]:
pepd = pep8(at)
vars()[pepd] = getattr(_t, at)
__all__.append(pepd)
del Dummy
del _t
del pep8