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"""Implementations of unittest features from the future."""
import difflib, re, sys, unittest
from coverage.backward import set # pylint: disable-msg=W0622
def _need(method):
"""Do we need to define our own `method` method?"""
return not hasattr(unittest.TestCase, method)
class TestCase(unittest.TestCase):
"""Just like unittest.TestCase, but with assert methods added.
Designed to be compatible with 3.1 unittest. Methods are only defined if
the builtin `unittest` doesn't have them.
"""
if _need('assertTrue'):
def assertTrue(self, exp, msg=None):
"""Assert that `exp` is true."""
if not exp:
self.fail(msg)
if _need('assertFalse'):
def assertFalse(self, exp, msg=None):
"""Assert that `exp` is false."""
if exp:
self.fail(msg)
if _need('assertRaisesRegexp'):
def assertRaisesRegexp(self, excClass, regexp, callobj, *args, **kw):
""" Just like unittest.TestCase.assertRaises,
but checks that the message is right too.
"""
try:
callobj(*args, **kw)
except excClass:
_, exc, _ = sys.exc_info()
excMsg = str(exc)
if re.search(regexp, excMsg):
# Message provided, and we got the right one: it passes.
return
else:
# Message provided, and it didn't match: fail!
raise self.failureException(
"Right exception, wrong message: "
"'%s' doesn't match '%s'" % (excMsg, regexp)
)
# No need to catch other exceptions: They'll fail the test all by
# themselves!
else:
if hasattr(excClass, '__name__'):
excName = excClass.__name__
else:
excName = str(excClass)
raise self.failureException(
"Expected to raise %s, didn't get an exception at all" %
excName
)
if _need('assertSameElements'):
def assertSameElements(self, s1, s2):
"""Assert that the two arguments are equal as sets."""
self.assertEqual(set(s1), set(s2))
if _need('assertRegexpMatches'):
def assertRegexpMatches(self, s, regex):
"""Assert that `s` matches `regex`."""
m = re.search(regex, s)
if not m:
raise self.failureException("%r doesn't match %r" % (s, regex))
if _need('assertMultiLineEqual'):
def assertMultiLineEqual(self, first, second, msg=None):
"""Assert that two multi-line strings are equal.
If they aren't, show a nice diff.
"""
# Adapted from Py3.1 unittest.
self.assertTrue(isinstance(first, str),
'First argument is not a string')
self.assertTrue(isinstance(second, str),
'Second argument is not a string')
if first != second:
message = ''.join(difflib.ndiff(first.splitlines(True),
second.splitlines(True)))
if msg:
message += " : " + msg
self.fail("Multi-line strings are unequal:\n" + message)
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