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v0.5.0
https://github.com/python/cpython
Tip revision: aa36b9cc0143e8726d387aee8b7918b35e840178 authored by Benjamin Peterson on 04 April 2009, 21:08:03 UTC
I don't think RELNOTES is useful anymore
I don't think RELNOTES is useful anymore
Tip revision: aa36b9c
unittest.py
#!/usr/bin/env python
'''
Python unit testing framework, based on Erich Gamma's JUnit and Kent Beck's
Smalltalk testing framework.
This module contains the core framework classes that form the basis of
specific test cases and suites (TestCase, TestSuite etc.), and also a
text-based utility class for running the tests and reporting the results
(TextTestRunner).
Simple usage:
import unittest
class IntegerArithmenticTestCase(unittest.TestCase):
def testAdd(self): ## test method names begin 'test*'
self.assertEqual((1 + 2), 3)
self.assertEqual(0 + 1, 1)
def testMultiply(self):
self.assertEqual((0 * 10), 0)
self.assertEqual((5 * 8), 40)
if __name__ == '__main__':
unittest.main()
Further information is available in the bundled documentation, and from
http://docs.python.org/library/unittest.html
Copyright (c) 1999-2003 Steve Purcell
Copyright (c) 2003-2009 Python Software Foundation
This module is free software, and you may redistribute it and/or modify
it under the same terms as Python itself, so long as this copyright message
and disclaimer are retained in their original form.
IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF
THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.
THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS,
AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
'''
import difflib
import functools
import os
import pprint
import re
import sys
import time
import traceback
import types
import warnings
##############################################################################
# Exported classes and functions
##############################################################################
__all__ = ['TestResult', 'TestCase', 'TestSuite', 'ClassTestSuite',
'TextTestRunner', 'TestLoader', 'FunctionTestCase', 'main',
'defaultTestLoader', 'SkipTest', 'skip', 'skipIf', 'skipUnless',
'expectedFailure']
# Expose obsolete functions for backwards compatibility
__all__.extend(['getTestCaseNames', 'makeSuite', 'findTestCases'])
##############################################################################
# Test framework core
##############################################################################
def _strclass(cls):
return "%s.%s" % (cls.__module__, cls.__name__)
class SkipTest(Exception):
"""
Raise this exception in a test to skip it.
Usually you can use TestResult.skip() or one of the skipping decorators
instead of raising this directly.
"""
pass
class _ExpectedFailure(Exception):
"""
Raise this when a test is expected to fail.
This is an implementation detail.
"""
def __init__(self, exc_info):
super(_ExpectedFailure, self).__init__()
self.exc_info = exc_info
class _UnexpectedSuccess(Exception):
"""
The test was supposed to fail, but it didn't!
"""
pass
def _id(obj):
return obj
def skip(reason):
"""
Unconditionally skip a test.
"""
def decorator(test_item):
if isinstance(test_item, type) and issubclass(test_item, TestCase):
test_item.__unittest_skip__ = True
test_item.__unittest_skip_why__ = reason
return test_item
@functools.wraps(test_item)
def skip_wrapper(*args, **kwargs):
raise SkipTest(reason)
return skip_wrapper
return decorator
def skipIf(condition, reason):
"""
Skip a test if the condition is true.
"""
if condition:
return skip(reason)
return _id
def skipUnless(condition, reason):
"""
Skip a test unless the condition is true.
"""
if not condition:
return skip(reason)
return _id
def expectedFailure(func):
@functools.wraps(func)
def wrapper(*args, **kwargs):
try:
func(*args, **kwargs)
except Exception:
raise _ExpectedFailure(sys.exc_info())
raise _UnexpectedSuccess
return wrapper
__unittest = 1
class TestResult(object):
"""Holder for test result information.
Test results are automatically managed by the TestCase and TestSuite
classes, and do not need to be explicitly manipulated by writers of tests.
Each instance holds the total number of tests run, and collections of
failures and errors that occurred among those test runs. The collections
contain tuples of (testcase, exceptioninfo), where exceptioninfo is the
formatted traceback of the error that occurred.
"""
def __init__(self):
self.failures = []
self.errors = []
self.testsRun = 0
self.skipped = []
self.expectedFailures = []
self.unexpectedSuccesses = []
self.shouldStop = False
def startTest(self, test):
"Called when the given test is about to be run"
self.testsRun = self.testsRun + 1
def stopTest(self, test):
"Called when the given test has been run"
pass
def addError(self, test, err):
"""Called when an error has occurred. 'err' is a tuple of values as
returned by sys.exc_info().
"""
self.errors.append((test, self._exc_info_to_string(err, test)))
def addFailure(self, test, err):
"""Called when an error has occurred. 'err' is a tuple of values as
returned by sys.exc_info()."""
self.failures.append((test, self._exc_info_to_string(err, test)))
def addSuccess(self, test):
"Called when a test has completed successfully"
pass
def addSkip(self, test, reason):
"""Called when a test is skipped."""
self.skipped.append((test, reason))
def addExpectedFailure(self, test, err):
"""Called when an expected failure/error occured."""
self.expectedFailures.append(
(test, self._exc_info_to_string(err, test)))
def addUnexpectedSuccess(self, test):
"""Called when a test was expected to fail, but succeed."""
self.unexpectedSuccesses.append(test)
def wasSuccessful(self):
"Tells whether or not this result was a success"
return len(self.failures) == len(self.errors) == 0
def stop(self):
"Indicates that the tests should be aborted"
self.shouldStop = True
def _exc_info_to_string(self, err, test):
"""Converts a sys.exc_info()-style tuple of values into a string."""
exctype, value, tb = err
# Skip test runner traceback levels
while tb and self._is_relevant_tb_level(tb):
tb = tb.tb_next
if exctype is test.failureException:
# Skip assert*() traceback levels
length = self._count_relevant_tb_levels(tb)
return ''.join(traceback.format_exception(exctype, value,
tb, length))
return ''.join(traceback.format_exception(exctype, value, tb))
def _is_relevant_tb_level(self, tb):
return '__unittest' in tb.tb_frame.f_globals
def _count_relevant_tb_levels(self, tb):
length = 0
while tb and not self._is_relevant_tb_level(tb):
length += 1
tb = tb.tb_next
return length
def __repr__(self):
return "<%s run=%i errors=%i failures=%i>" % \
(_strclass(self.__class__), self.testsRun, len(self.errors),
len(self.failures))
class _AssertRaisesContext(object):
"""A context manager used to implement TestCase.assertRaises* methods."""
def __init__(self, expected, test_case, callable_obj=None,
expected_regexp=None):
self.expected = expected
self.failureException = test_case.failureException
if callable_obj is not None:
try:
self.obj_name = callable_obj.__name__
except AttributeError:
self.obj_name = str(callable_obj)
else:
self.obj_name = None
self.expected_regex = expected_regexp
def __enter__(self):
pass
def __exit__(self, exc_type, exc_value, traceback):
if exc_type is None:
try:
exc_name = self.expected.__name__
except AttributeError:
exc_name = str(self.expected)
if self.obj_name:
raise self.failureException("{0} not raised by {1}"
.format(exc_name, self.obj_name))
else:
raise self.failureException("{0} not raised"
.format(exc_name))
if not issubclass(exc_type, self.expected):
# let unexpected exceptions pass through
return False
if self.expected_regex is None:
return True
expected_regexp = self.expected_regex
if isinstance(expected_regexp, (bytes, str)):
expected_regexp = re.compile(expected_regexp)
if not expected_regexp.search(str(exc_value)):
raise self.failureException('"%s" does not match "%s"' %
(expected_regexp.pattern, str(exc_value)))
return True
class _AssertWrapper(object):
"""Wrap entries in the _type_equality_funcs registry to make them deep
copyable."""
def __init__(self, function):
self.function = function
def __deepcopy__(self, memo):
memo[id(self)] = self
class TestCase(object):
"""A class whose instances are single test cases.
By default, the test code itself should be placed in a method named
'runTest'.
If the fixture may be used for many test cases, create as
many test methods as are needed. When instantiating such a TestCase
subclass, specify in the constructor arguments the name of the test method
that the instance is to execute.
Test authors should subclass TestCase for their own tests. Construction
and deconstruction of the test's environment ('fixture') can be
implemented by overriding the 'setUp' and 'tearDown' methods respectively.
If it is necessary to override the __init__ method, the base class
__init__ method must always be called. It is important that subclasses
should not change the signature of their __init__ method, since instances
of the classes are instantiated automatically by parts of the framework
in order to be run.
"""
# This attribute determines which exception will be raised when
# the instance's assertion methods fail; test methods raising this
# exception will be deemed to have 'failed' rather than 'errored'
failureException = AssertionError
# This attribute determines whether long messages (including repr of
# objects used in assert methods) will be printed on failure in *addition*
# to any explicit message passed.
longMessage = False
def __init__(self, methodName='runTest'):
"""Create an instance of the class that will use the named test
method when executed. Raises a ValueError if the instance does
not have a method with the specified name.
"""
self._testMethodName = methodName
try:
testMethod = getattr(self, methodName)
except AttributeError:
raise ValueError("no such test method in %s: %s" % \
(self.__class__, methodName))
self._testMethodDoc = testMethod.__doc__
# Map types to custom assertEqual functions that will compare
# instances of said type in more detail to generate a more useful
# error message.
self._type_equality_funcs = {}
self.addTypeEqualityFunc(dict, self.assertDictEqual)
self.addTypeEqualityFunc(list, self.assertListEqual)
self.addTypeEqualityFunc(tuple, self.assertTupleEqual)
self.addTypeEqualityFunc(set, self.assertSetEqual)
self.addTypeEqualityFunc(frozenset, self.assertSetEqual)
def addTypeEqualityFunc(self, typeobj, function):
"""Add a type specific assertEqual style function to compare a type.
This method is for use by TestCase subclasses that need to register
their own type equality functions to provide nicer error messages.
Args:
typeobj: The data type to call this function on when both values
are of the same type in assertEqual().
function: The callable taking two arguments and an optional
msg= argument that raises self.failureException with a
useful error message when the two arguments are not equal.
"""
self._type_equality_funcs[typeobj] = _AssertWrapper(function)
def setUp(self):
"Hook method for setting up the test fixture before exercising it."
pass
def tearDown(self):
"Hook method for deconstructing the test fixture after testing it."
pass
def countTestCases(self):
return 1
def defaultTestResult(self):
return TestResult()
def shortDescription(self):
"""Returns both the test method name and first line of its docstring.
If no docstring is given, only returns the method name.
This method overrides unittest.TestCase.shortDescription(), which
only returns the first line of the docstring, obscuring the name
of the test upon failure.
"""
desc = str(self)
doc_first_line = None
if self._testMethodDoc:
doc_first_line = self._testMethodDoc.split("\n")[0].strip()
if doc_first_line:
desc = '\n'.join((desc, doc_first_line))
return desc
def id(self):
return "%s.%s" % (_strclass(self.__class__), self._testMethodName)
def __eq__(self, other):
if type(self) is not type(other):
return NotImplemented
return self._testMethodName == other._testMethodName
def __ne__(self, other):
return not self == other
def __hash__(self):
return hash((type(self), self._testMethodName))
def __str__(self):
return "%s (%s)" % (self._testMethodName, _strclass(self.__class__))
def __repr__(self):
return "<%s testMethod=%s>" % \
(_strclass(self.__class__), self._testMethodName)
def run(self, result=None):
if result is None:
result = self.defaultTestResult()
result.startTest(self)
testMethod = getattr(self, self._testMethodName)
try:
try:
self.setUp()
except SkipTest as e:
result.addSkip(self, str(e))
return
except Exception:
result.addError(self, sys.exc_info())
return
success = False
try:
testMethod()
except self.failureException:
result.addFailure(self, sys.exc_info())
except _ExpectedFailure as e:
result.addExpectedFailure(self, e.exc_info)
except _UnexpectedSuccess:
result.addUnexpectedSuccess(self)
except SkipTest as e:
result.addSkip(self, str(e))
except Exception:
result.addError(self, sys.exc_info())
else:
success = True
try:
self.tearDown()
except Exception:
result.addError(self, sys.exc_info())
success = False
if success:
result.addSuccess(self)
finally:
result.stopTest(self)
def __call__(self, *args, **kwds):
return self.run(*args, **kwds)
def debug(self):
"""Run the test without collecting errors in a TestResult"""
self.setUp()
getattr(self, self._testMethodName)()
self.tearDown()
def skipTest(self, reason):
"""Skip this test."""
raise SkipTest(reason)
def fail(self, msg=None):
"""Fail immediately, with the given message."""
raise self.failureException(msg)
def assertFalse(self, expr, msg=None):
"Fail the test if the expression is true."
if expr:
msg = self._formatMessage(msg, "%r is not False" % expr)
raise self.failureException(msg)
def assertTrue(self, expr, msg=None):
"""Fail the test unless the expression is true."""
if not expr:
msg = self._formatMessage(msg, "%r is not True" % expr)
raise self.failureException(msg)
def _formatMessage(self, msg, standardMsg):
"""Honour the longMessage attribute when generating failure messages.
If longMessage is False this means:
* Use only an explicit message if it is provided
* Otherwise use the standard message for the assert
If longMessage is True:
* Use the standard message
* If an explicit message is provided, plus ' : ' and the explicit message
"""
if not self.longMessage:
return msg or standardMsg
if msg is None:
return standardMsg
return standardMsg + ' : ' + msg
def assertRaises(self, excClass, callableObj=None, *args, **kwargs):
"""Fail unless an exception of class excClass is thrown
by callableObj when invoked with arguments args and keyword
arguments kwargs. If a different type of exception is
thrown, it will not be caught, and the test case will be
deemed to have suffered an error, exactly as for an
unexpected exception.
If called with callableObj omitted or None, will return a
context object used like this::
with self.assertRaises(some_error_class):
do_something()
"""
context = _AssertRaisesContext(excClass, self, callableObj)
if callableObj is None:
return context
with context:
callableObj(*args, **kwargs)
def _getAssertEqualityFunc(self, first, second):
"""Get a detailed comparison function for the types of the two args.
Returns: A callable accepting (first, second, msg=None) that will
raise a failure exception if first != second with a useful human
readable error message for those types.
"""
#
# NOTE(gregory.p.smith): I considered isinstance(first, type(second))
# and vice versa. I opted for the conservative approach in case
# subclasses are not intended to be compared in detail to their super
# class instances using a type equality func. This means testing
# subtypes won't automagically use the detailed comparison. Callers
# should use their type specific assertSpamEqual method to compare
# subclasses if the detailed comparison is desired and appropriate.
# See the discussion in http://bugs.python.org/issue2578.
#
if type(first) is type(second):
asserter = self._type_equality_funcs.get(type(first))
if asserter is not None:
return asserter.function
return self._baseAssertEqual
def _baseAssertEqual(self, first, second, msg=None):
"""The default assertEqual implementation, not type specific."""
if not first == second:
standardMsg = '%r != %r' % (first, second)
msg = self._formatMessage(msg, standardMsg)
raise self.failureException(msg)
def assertEqual(self, first, second, msg=None):
"""Fail if the two objects are unequal as determined by the '=='
operator.
"""
assertion_func = self._getAssertEqualityFunc(first, second)
assertion_func(first, second, msg=msg)
def assertNotEqual(self, first, second, msg=None):
"""Fail if the two objects are equal as determined by the '=='
operator.
"""
if not first != second:
msg = self._formatMessage(msg, '%r == %r' % (first, second))
raise self.failureException(msg)
def assertAlmostEqual(self, first, second, *, places=7, msg=None):
"""Fail if the two objects are unequal as determined by their
difference rounded to the given number of decimal places
(default 7) and comparing to zero.
Note that decimal places (from zero) are usually not the same
as significant digits (measured from the most signficant digit).
"""
if round(abs(second-first), places) != 0:
standardMsg = '%r != %r within %r places' % (first, second, places)
msg = self._formatMessage(msg, standardMsg)
raise self.failureException(msg)
def assertNotAlmostEqual(self, first, second, *, places=7, msg=None):
"""Fail if the two objects are equal as determined by their
difference rounded to the given number of decimal places
(default 7) and comparing to zero.
Note that decimal places (from zero) are usually not the same
as significant digits (measured from the most signficant digit).
"""
if round(abs(second-first), places) == 0:
standardMsg = '%r == %r within %r places' % (first, second, places)
msg = self._formatMessage(msg, standardMsg)
raise self.failureException(msg)
# Synonyms for assertion methods
# The plurals are undocumented. Keep them that way to discourage use.
# Do not add more. Do not remove.
# Going through a deprecation cycle on these would annoy many people.
assertEquals = assertEqual
assertNotEquals = assertNotEqual
assertAlmostEquals = assertAlmostEqual
assertNotAlmostEquals = assertNotAlmostEqual
assert_ = assertTrue
# These fail* assertion method names are pending deprecation and will
# be a DeprecationWarning in 3.2; http://bugs.python.org/issue2578
def _deprecate(original_func):
def deprecated_func(*args, **kwargs):
warnings.warn(
'Please use {0} instead.'.format(original_func.__name__),
PendingDeprecationWarning, 2)
return original_func(*args, **kwargs)
return deprecated_func
failUnlessEqual = _deprecate(assertEqual)
failIfEqual = _deprecate(assertNotEqual)
failUnlessAlmostEqual = _deprecate(assertAlmostEqual)
failIfAlmostEqual = _deprecate(assertNotAlmostEqual)
failUnless = _deprecate(assertTrue)
failUnlessRaises = _deprecate(assertRaises)
failIf = _deprecate(assertFalse)
def assertSequenceEqual(self, seq1, seq2, msg=None, seq_type=None):
"""An equality assertion for ordered sequences (like lists and tuples).
For the purposes of this function, a valid orderd sequence type is one
which can be indexed, has a length, and has an equality operator.
Args:
seq1: The first sequence to compare.
seq2: The second sequence to compare.
seq_type: The expected datatype of the sequences, or None if no
datatype should be enforced.
msg: Optional message to use on failure instead of a list of
differences.
"""
if seq_type != None:
seq_type_name = seq_type.__name__
if not isinstance(seq1, seq_type):
raise self.failureException('First sequence is not a %s: %r'
% (seq_type_name, seq1))
if not isinstance(seq2, seq_type):
raise self.failureException('Second sequence is not a %s: %r'
% (seq_type_name, seq2))
else:
seq_type_name = "sequence"
differing = None
try:
len1 = len(seq1)
except (TypeError, NotImplementedError):
differing = 'First %s has no length. Non-sequence?' % (
seq_type_name)
if differing is None:
try:
len2 = len(seq2)
except (TypeError, NotImplementedError):
differing = 'Second %s has no length. Non-sequence?' % (
seq_type_name)
if differing is None:
if seq1 == seq2:
return
for i in range(min(len1, len2)):
try:
item1 = seq1[i]
except (TypeError, IndexError, NotImplementedError):
differing = ('Unable to index element %d of first %s\n' %
(i, seq_type_name))
break
try:
item2 = seq2[i]
except (TypeError, IndexError, NotImplementedError):
differing = ('Unable to index element %d of second %s\n' %
(i, seq_type_name))
break
if item1 != item2:
differing = ('First differing element %d:\n%s\n%s\n' %
(i, item1, item2))
break
else:
if (len1 == len2 and seq_type is None and
type(seq1) != type(seq2)):
# The sequences are the same, but have differing types.
return
# A catch-all message for handling arbitrary user-defined
# sequences.
differing = '%ss differ:\n' % seq_type_name.capitalize()
if len1 > len2:
differing = ('First %s contains %d additional '
'elements.\n' % (seq_type_name, len1 - len2))
try:
differing += ('First extra element %d:\n%s\n' %
(len2, seq1[len2]))
except (TypeError, IndexError, NotImplementedError):
differing += ('Unable to index element %d '
'of first %s\n' % (len2, seq_type_name))
elif len1 < len2:
differing = ('Second %s contains %d additional '
'elements.\n' % (seq_type_name, len2 - len1))
try:
differing += ('First extra element %d:\n%s\n' %
(len1, seq2[len1]))
except (TypeError, IndexError, NotImplementedError):
differing += ('Unable to index element %d '
'of second %s\n' % (len1, seq_type_name))
standardMsg = differing + '\n'.join(difflib.ndiff(pprint.pformat(seq1).splitlines(),
pprint.pformat(seq2).splitlines()))
msg = self._formatMessage(msg, standardMsg)
self.fail(msg)
def assertListEqual(self, list1, list2, msg=None):
"""A list-specific equality assertion.
Args:
list1: The first list to compare.
list2: The second list to compare.
msg: Optional message to use on failure instead of a list of
differences.
"""
self.assertSequenceEqual(list1, list2, msg, seq_type=list)
def assertTupleEqual(self, tuple1, tuple2, msg=None):
"""A tuple-specific equality assertion.
Args:
tuple1: The first tuple to compare.
tuple2: The second tuple to compare.
msg: Optional message to use on failure instead of a list of
differences.
"""
self.assertSequenceEqual(tuple1, tuple2, msg, seq_type=tuple)
def assertSetEqual(self, set1, set2, msg=None):
"""A set-specific equality assertion.
Args:
set1: The first set to compare.
set2: The second set to compare.
msg: Optional message to use on failure instead of a list of
differences.
For more general containership equality, assertSameElements will work
with things other than sets. This uses ducktyping to support
different types of sets, and is optimized for sets specifically
(parameters must support a difference method).
"""
try:
difference1 = set1.difference(set2)
except TypeError as e:
self.fail('invalid type when attempting set difference: %s' % e)
except AttributeError as e:
self.fail('first argument does not support set difference: %s' % e)
try:
difference2 = set2.difference(set1)
except TypeError as e:
self.fail('invalid type when attempting set difference: %s' % e)
except AttributeError as e:
self.fail('second argument does not support set difference: %s' % e)
if not (difference1 or difference2):
return
lines = []
if difference1:
lines.append('Items in the first set but not the second:')
for item in difference1:
lines.append(repr(item))
if difference2:
lines.append('Items in the second set but not the first:')
for item in difference2:
lines.append(repr(item))
standardMsg = '\n'.join(lines)
self.fail(self._formatMessage(msg, standardMsg))
def assertIn(self, member, container, msg=None):
"""Just like self.assertTrue(a in b), but with a nicer default message."""
if member not in container:
standardMsg = '%r not found in %r' % (member, container)
self.fail(self._formatMessage(msg, standardMsg))
def assertNotIn(self, member, container, msg=None):
"""Just like self.assertTrue(a not in b), but with a nicer default message."""
if member in container:
standardMsg = '%r unexpectedly found in %r' % (member, container)
self.fail(self._formatMessage(msg, standardMsg))
def assertDictEqual(self, d1, d2, msg=None):
self.assert_(isinstance(d1, dict), 'First argument is not a dictionary')
self.assert_(isinstance(d2, dict), 'Second argument is not a dictionary')
if d1 != d2:
standardMsg = ('\n' + '\n'.join(difflib.ndiff(
pprint.pformat(d1).splitlines(),
pprint.pformat(d2).splitlines())))
self.fail(self._formatMessage(msg, standardMsg))
def assertDictContainsSubset(self, expected, actual, msg=None):
"""Checks whether actual is a superset of expected."""
missing = []
mismatched = []
for key, value in expected.items():
if key not in actual:
missing.append(key)
elif value != actual[key]:
mismatched.append('%s, expected: %s, actual: %s' % (key, value, actual[key]))
if not (missing or mismatched):
return
standardMsg = ''
if missing:
standardMsg = 'Missing: %r' % ','.join(missing)
if mismatched:
if standardMsg:
standardMsg += '; '
standardMsg += 'Mismatched values: %s' % ','.join(mismatched)
self.fail(self._formatMessage(msg, standardMsg))
def assertSameElements(self, expected_seq, actual_seq, msg=None):
"""An unordered sequence specific comparison.
Raises with an error message listing which elements of expected_seq
are missing from actual_seq and vice versa if any.
"""
try:
expected = set(expected_seq)
actual = set(actual_seq)
missing = list(expected.difference(actual))
unexpected = list(actual.difference(expected))
missing.sort()
unexpected.sort()
except TypeError:
# Fall back to slower list-compare if any of the objects are
# not hashable.
expected = list(expected_seq)
actual = list(actual_seq)
try:
expected.sort()
actual.sort()
except TypeError:
missing, unexpected = _UnorderableListDifference(expected, actual)
else:
missing, unexpected = _SortedListDifference(expected, actual)
errors = []
if missing:
errors.append('Expected, but missing:\n %r' % missing)
if unexpected:
errors.append('Unexpected, but present:\n %r' % unexpected)
if errors:
standardMsg = '\n'.join(errors)
self.fail(self._formatMessage(msg, standardMsg))
def assertMultiLineEqual(self, first, second, msg=None):
"""Assert that two multi-line strings are equal."""
self.assert_(isinstance(first, str), (
'First argument is not a string'))
self.assert_(isinstance(second, str), (
'Second argument is not a string'))
if first != second:
standardMsg = '\n' + ''.join(difflib.ndiff(first.splitlines(True), second.splitlines(True)))
self.fail(self._formatMessage(msg, standardMsg))
def assertLess(self, a, b, msg=None):
"""Just like self.assertTrue(a < b), but with a nicer default message."""
if not a < b:
standardMsg = '%r not less than %r' % (a, b)
self.fail(self._formatMessage(msg, standardMsg))
def assertLessEqual(self, a, b, msg=None):
"""Just like self.assertTrue(a <= b), but with a nicer default message."""
if not a <= b:
standardMsg = '%r not less than or equal to %r' % (a, b)
self.fail(self._formatMessage(msg, standardMsg))
def assertGreater(self, a, b, msg=None):
"""Just like self.assertTrue(a > b), but with a nicer default message."""
if not a > b:
standardMsg = '%r not greater than %r' % (a, b)
self.fail(self._formatMessage(msg, standardMsg))
def assertGreaterEqual(self, a, b, msg=None):
"""Just like self.assertTrue(a >= b), but with a nicer default message."""
if not a >= b:
standardMsg = '%r not greater than or equal to %r' % (a, b)
self.fail(self._formatMessage(msg, standardMsg))
def assertIsNone(self, obj, msg=None):
"""Same as self.assertTrue(obj is None), with a nicer default message."""
if obj is not None:
standardMsg = '%r is not None' % obj
self.fail(self._formatMessage(msg, standardMsg))
def assertIsNotNone(self, obj, msg=None):
"""Included for symmetry with assertIsNone."""
if obj is None:
standardMsg = 'unexpectedly None'
self.fail(self._formatMessage(msg, standardMsg))
def assertRaisesRegexp(self, expected_exception, expected_regexp,
callable_obj=None, *args, **kwargs):
"""Asserts that the message in a raised exception matches a regexp.
Args:
expected_exception: Exception class expected to be raised.
expected_regexp: Regexp (re pattern object or string) expected
to be found in error message.
callable_obj: Function to be called.
args: Extra args.
kwargs: Extra kwargs.
"""
context = _AssertRaisesContext(expected_exception, self, callable_obj,
expected_regexp)
if callable_obj is None:
return context
with context:
callable_obj(*args, **kwargs)
def assertRegexpMatches(self, text, expected_regex, msg=None):
if isinstance(expected_regex, (str, bytes)):
expected_regex = re.compile(expected_regex)
if not expected_regex.search(text):
msg = msg or "Regexp didn't match"
msg = '%s: %r not found in %r' % (msg, expected_regex.pattern, text)
raise self.failureException(msg)
def _SortedListDifference(expected, actual):
"""Finds elements in only one or the other of two, sorted input lists.
Returns a two-element tuple of lists. The first list contains those
elements in the "expected" list but not in the "actual" list, and the
second contains those elements in the "actual" list but not in the
"expected" list. Duplicate elements in either input list are ignored.
"""
i = j = 0
missing = []
unexpected = []
while True:
try:
e = expected[i]
a = actual[j]
if e < a:
missing.append(e)
i += 1
while expected[i] == e:
i += 1
elif e > a:
unexpected.append(a)
j += 1
while actual[j] == a:
j += 1
else:
i += 1
try:
while expected[i] == e:
i += 1
finally:
j += 1
while actual[j] == a:
j += 1
except IndexError:
missing.extend(expected[i:])
unexpected.extend(actual[j:])
break
return missing, unexpected
def _UnorderableListDifference(expected, actual):
"""Same behavior as _SortedListDifference but
for lists of unorderable items (like dicts).
As it does a linear search per item (remove) it
has O(n*n) performance."""
missing = []
while expected:
item = expected.pop()
try:
actual.remove(item)
except ValueError:
missing.append(item)
# anything left in actual is unexpected
return missing, actual
class TestSuite(object):
"""A test suite is a composite test consisting of a number of TestCases.
For use, create an instance of TestSuite, then add test case instances.
When all tests have been added, the suite can be passed to a test
runner, such as TextTestRunner. It will run the individual test cases
in the order in which they were added, aggregating the results. When
subclassing, do not forget to call the base class constructor.
"""
def __init__(self, tests=()):
self._tests = []
self.addTests(tests)
def __repr__(self):
return "<%s tests=%s>" % (_strclass(self.__class__), self._tests)
def __eq__(self, other):
if not isinstance(other, self.__class__):
return NotImplemented
return self._tests == other._tests
def __ne__(self, other):
return not self == other
def __iter__(self):
return iter(self._tests)
def countTestCases(self):
cases = 0
for test in self._tests:
cases += test.countTestCases()
return cases
def addTest(self, test):
# sanity checks
if not hasattr(test, '__call__'):
raise TypeError("the test to add must be callable")
if isinstance(test, type) and issubclass(test, (TestCase, TestSuite)):
raise TypeError("TestCases and TestSuites must be instantiated "
"before passing them to addTest()")
self._tests.append(test)
def addTests(self, tests):
if isinstance(tests, str):
raise TypeError("tests must be an iterable of tests, not a string")
for test in tests:
self.addTest(test)
def run(self, result):
for test in self._tests:
if result.shouldStop:
break
test(result)
return result
def __call__(self, *args, **kwds):
return self.run(*args, **kwds)
def debug(self):
"""Run the tests without collecting errors in a TestResult"""
for test in self._tests:
test.debug()
class ClassTestSuite(TestSuite):
"""
Suite of tests derived from a single TestCase class.
"""
def __init__(self, tests, class_collected_from):
super(ClassTestSuite, self).__init__(tests)
self.collected_from = class_collected_from
def id(self):
module = getattr(self.collected_from, "__module__", None)
if module is not None:
return "{0}.{1}".format(module, self.collected_from.__name__)
return self.collected_from.__name__
def run(self, result):
if getattr(self.collected_from, "__unittest_skip__", False):
# ClassTestSuite result pretends to be a TestCase enough to be
# reported.
result.startTest(self)
try:
result.addSkip(self, self.collected_from.__unittest_skip_why__)
finally:
result.stopTest(self)
else:
result = super(ClassTestSuite, self).run(result)
return result
shortDescription = id
class FunctionTestCase(TestCase):
"""A test case that wraps a test function.
This is useful for slipping pre-existing test functions into the
unittest framework. Optionally, set-up and tidy-up functions can be
supplied. As with TestCase, the tidy-up ('tearDown') function will
always be called if the set-up ('setUp') function ran successfully.
"""
def __init__(self, testFunc, setUp=None, tearDown=None, description=None):
super(FunctionTestCase, self).__init__()
self._setUpFunc = setUp
self._tearDownFunc = tearDown
self._testFunc = testFunc
self._description = description
def setUp(self):
if self._setUpFunc is not None:
self._setUpFunc()
def tearDown(self):
if self._tearDownFunc is not None:
self._tearDownFunc()
def runTest(self):
self._testFunc()
def id(self):
return self._testFunc.__name__
def __eq__(self, other):
if not isinstance(other, self.__class__):
return NotImplemented
return self._setUpFunc == other._setUpFunc and \
self._tearDownFunc == other._tearDownFunc and \
self._testFunc == other._testFunc and \
self._description == other._description
def __ne__(self, other):
return not self == other
def __hash__(self):
return hash((type(self), self._setUpFunc, self._tearDownFunc,
self._testFunc, self._description))
def __str__(self):
return "%s (%s)" % (_strclass(self.__class__),
self.__testFunc.__name__)
def __repr__(self):
return "<%s testFunc=%s>" % (_strclass(self.__class__), self._testFunc)
def shortDescription(self):
if self._description is not None:
return self._description
doc = self._testFunc.__doc__
return doc and doc.split("\n")[0].strip() or None
##############################################################################
# Locating and loading tests
##############################################################################
def CmpToKey(mycmp):
'Convert a cmp= function into a key= function'
class K(object):
def __init__(self, obj, *args):
self.obj = obj
def __lt__(self, other):
return mycmp(self.obj, other.obj) == -1
return K
def three_way_cmp(x, y):
"""Return -1 if x < y, 0 if x == y and 1 if x > y"""
return (x > y) - (x < y)
class TestLoader(object):
"""
This class is responsible for loading tests according to various criteria
and returning them wrapped in a TestSuite
"""
testMethodPrefix = 'test'
sortTestMethodsUsing = staticmethod(three_way_cmp)
suiteClass = TestSuite
classSuiteClass = ClassTestSuite
def loadTestsFromTestCase(self, testCaseClass):
"""Return a suite of all tests cases contained in testCaseClass"""
if issubclass(testCaseClass, TestSuite):
raise TypeError("Test cases should not be derived from TestSuite." \
" Maybe you meant to derive from TestCase?")
testCaseNames = self.getTestCaseNames(testCaseClass)
if not testCaseNames and hasattr(testCaseClass, 'runTest'):
testCaseNames = ['runTest']
suite = self.classSuiteClass(map(testCaseClass, testCaseNames),
testCaseClass)
return suite
def loadTestsFromModule(self, module):
"""Return a suite of all tests cases contained in the given module"""
tests = []
for name in dir(module):
obj = getattr(module, name)
if isinstance(obj, type) and issubclass(obj, TestCase):
tests.append(self.loadTestsFromTestCase(obj))
return self.suiteClass(tests)
def loadTestsFromName(self, name, module=None):
"""Return a suite of all tests cases given a string specifier.
The name may resolve either to a module, a test case class, a
test method within a test case class, or a callable object which
returns a TestCase or TestSuite instance.
The method optionally resolves the names relative to a given module.
"""
parts = name.split('.')
if module is None:
parts_copy = parts[:]
while parts_copy:
try:
module = __import__('.'.join(parts_copy))
break
except ImportError:
del parts_copy[-1]
if not parts_copy:
raise
parts = parts[1:]
obj = module
for part in parts:
parent, obj = obj, getattr(obj, part)
if isinstance(obj, types.ModuleType):
return self.loadTestsFromModule(obj)
elif isinstance(obj, type) and issubclass(obj, TestCase):
return self.loadTestsFromTestCase(obj)
elif (isinstance(obj, types.FunctionType) and
isinstance(parent, type) and
issubclass(parent, TestCase)):
name = obj.__name__
inst = parent(name)
# static methods follow a different path
if not isinstance(getattr(inst, name), types.FunctionType):
return TestSuite([inst])
elif isinstance(obj, TestSuite):
return obj
if hasattr(obj, '__call__'):
test = obj()
if isinstance(test, TestSuite):
return test
elif isinstance(test, TestCase):
return TestSuite([test])
else:
raise TypeError("calling %s returned %s, not a test" %
(obj, test))
else:
raise TypeError("don't know how to make test from: %s" % obj)
def loadTestsFromNames(self, names, module=None):
"""Return a suite of all tests cases found using the given sequence
of string specifiers. See 'loadTestsFromName()'.
"""
suites = [self.loadTestsFromName(name, module) for name in names]
return self.suiteClass(suites)
def getTestCaseNames(self, testCaseClass):
"""Return a sorted sequence of method names found within testCaseClass
"""
def isTestMethod(attrname, testCaseClass=testCaseClass,
prefix=self.testMethodPrefix):
return attrname.startswith(prefix) and \
hasattr(getattr(testCaseClass, attrname), '__call__')
testFnNames = list(filter(isTestMethod, dir(testCaseClass)))
if self.sortTestMethodsUsing:
testFnNames.sort(key=CmpToKey(self.sortTestMethodsUsing))
return testFnNames
defaultTestLoader = TestLoader()
##############################################################################
# Patches for old functions: these functions should be considered obsolete
##############################################################################
def _makeLoader(prefix, sortUsing, suiteClass=None):
loader = TestLoader()
loader.sortTestMethodsUsing = sortUsing
loader.testMethodPrefix = prefix
if suiteClass: loader.suiteClass = suiteClass
return loader
def getTestCaseNames(testCaseClass, prefix, sortUsing=three_way_cmp):
return _makeLoader(prefix, sortUsing).getTestCaseNames(testCaseClass)
def makeSuite(testCaseClass, prefix='test', sortUsing=three_way_cmp,
suiteClass=TestSuite):
return _makeLoader(prefix, sortUsing, suiteClass).loadTestsFromTestCase(
testCaseClass)
def findTestCases(module, prefix='test', sortUsing=three_way_cmp,
suiteClass=TestSuite):
return _makeLoader(prefix, sortUsing, suiteClass).loadTestsFromModule(
module)
##############################################################################
# Text UI
##############################################################################
class _WritelnDecorator(object):
"""Used to decorate file-like objects with a handy 'writeln' method"""
def __init__(self,stream):
self.stream = stream
def __getattr__(self, attr):
return getattr(self.stream,attr)
def writeln(self, arg=None):
if arg:
self.write(arg)
self.write('\n') # text-mode streams translate to \r\n if needed
class _TextTestResult(TestResult):
"""A test result class that can print formatted text results to a stream.
Used by TextTestRunner.
"""
separator1 = '=' * 70
separator2 = '-' * 70
def __init__(self, stream, descriptions, verbosity):
super(_TextTestResult, self).__init__()
self.stream = stream
self.showAll = verbosity > 1
self.dots = verbosity == 1
self.descriptions = descriptions
def getDescription(self, test):
if self.descriptions:
return test.shortDescription() or str(test)
else:
return str(test)
def startTest(self, test):
super(_TextTestResult, self).startTest(test)
if self.showAll:
self.stream.write(self.getDescription(test))
self.stream.write(" ... ")
self.stream.flush()
def addSuccess(self, test):
super(_TextTestResult, self).addSuccess(test)
if self.showAll:
self.stream.writeln("ok")
elif self.dots:
self.stream.write('.')
self.stream.flush()
def addError(self, test, err):
super(_TextTestResult, self).addError(test, err)
if self.showAll:
self.stream.writeln("ERROR")
elif self.dots:
self.stream.write('E')
self.stream.flush()
def addFailure(self, test, err):
super(_TextTestResult, self).addFailure(test, err)
if self.showAll:
self.stream.writeln("FAIL")
elif self.dots:
self.stream.write('F')
self.stream.flush()
def addSkip(self, test, reason):
super(_TextTestResult, self).addSkip(test, reason)
if self.showAll:
self.stream.writeln("skipped {0!r}".format(reason))
elif self.dots:
self.stream.write("s")
self.stream.flush()
def addExpectedFailure(self, test, err):
super(_TextTestResult, self).addExpectedFailure(test, err)
if self.showAll:
self.stream.writeln("expected failure")
elif self.dots:
self.stream.write("x")
self.stream.flush()
def addUnexpectedSuccess(self, test):
super(_TextTestResult, self).addUnexpectedSuccess(test)
if self.showAll:
self.stream.writeln("unexpected success")
elif self.dots:
self.stream.write("u")
self.stream.flush()
def printErrors(self):
if self.dots or self.showAll:
self.stream.writeln()
self.printErrorList('ERROR', self.errors)
self.printErrorList('FAIL', self.failures)
def printErrorList(self, flavour, errors):
for test, err in errors:
self.stream.writeln(self.separator1)
self.stream.writeln("%s: %s" % (flavour,self.getDescription(test)))
self.stream.writeln(self.separator2)
self.stream.writeln("%s" % err)
class TextTestRunner(object):
"""A test runner class that displays results in textual form.
It prints out the names of tests as they are run, errors as they
occur, and a summary of the results at the end of the test run.
"""
def __init__(self, stream=sys.stderr, descriptions=1, verbosity=1):
self.stream = _WritelnDecorator(stream)
self.descriptions = descriptions
self.verbosity = verbosity
def _makeResult(self):
return _TextTestResult(self.stream, self.descriptions, self.verbosity)
def run(self, test):
"Run the given test case or test suite."
result = self._makeResult()
startTime = time.time()
test(result)
stopTime = time.time()
timeTaken = stopTime - startTime
result.printErrors()
self.stream.writeln(result.separator2)
run = result.testsRun
self.stream.writeln("Ran %d test%s in %.3fs" %
(run, run != 1 and "s" or "", timeTaken))
self.stream.writeln()
results = map(len, (result.expectedFailures,
result.unexpectedSuccesses,
result.skipped))
expectedFails, unexpectedSuccesses, skipped = results
infos = []
if not result.wasSuccessful():
self.stream.write("FAILED")
failed, errored = len(result.failures), len(result.errors)
if failed:
infos.append("failures=%d" % failed)
if errored:
infos.append("errors=%d" % errored)
else:
self.stream.write("OK")
if skipped:
infos.append("skipped=%d" % skipped)
if expectedFails:
infos.append("expected failures=%d" % expectedFails)
if unexpectedSuccesses:
infos.append("unexpected successes=%d" % unexpectedSuccesses)
if infos:
self.stream.writeln(" (%s)" % (", ".join(infos),))
else:
self.stream.write("\n")
return result
##############################################################################
# Facilities for running tests from the command line
##############################################################################
class TestProgram(object):
"""A command-line program that runs a set of tests; this is primarily
for making test modules conveniently executable.
"""
USAGE = """\
Usage: %(progName)s [options] [test] [...]
Options:
-h, --help Show this message
-v, --verbose Verbose output
-q, --quiet Minimal output
Examples:
%(progName)s - run default set of tests
%(progName)s MyTestSuite - run suite 'MyTestSuite'
%(progName)s MyTestCase.testSomething - run MyTestCase.testSomething
%(progName)s MyTestCase - run all 'test*' test methods
in MyTestCase
"""
def __init__(self, module='__main__', defaultTest=None,
argv=None, testRunner=TextTestRunner,
testLoader=defaultTestLoader):
if isinstance(module, str):
self.module = __import__(module)
for part in module.split('.')[1:]:
self.module = getattr(self.module, part)
else:
self.module = module
if argv is None:
argv = sys.argv
self.verbosity = 1
self.defaultTest = defaultTest
self.testRunner = testRunner
self.testLoader = testLoader
self.progName = os.path.basename(argv[0])
self.parseArgs(argv)
self.runTests()
def usageExit(self, msg=None):
if msg:
print(msg)
print(self.USAGE % self.__dict__)
sys.exit(2)
def parseArgs(self, argv):
import getopt
long_opts = ['help','verbose','quiet']
try:
options, args = getopt.getopt(argv[1:], 'hHvq', long_opts)
for opt, value in options:
if opt in ('-h','-H','--help'):
self.usageExit()
if opt in ('-q','--quiet'):
self.verbosity = 0
if opt in ('-v','--verbose'):
self.verbosity = 2
if len(args) == 0 and self.defaultTest is None:
self.test = self.testLoader.loadTestsFromModule(self.module)
return
if len(args) > 0:
self.testNames = args
else:
self.testNames = (self.defaultTest,)
self.createTests()
except getopt.error as msg:
self.usageExit(msg)
def createTests(self):
self.test = self.testLoader.loadTestsFromNames(self.testNames,
self.module)
def runTests(self):
if isinstance(self.testRunner, type):
try:
testRunner = self.testRunner(verbosity=self.verbosity)
except TypeError:
# didn't accept the verbosity argument
testRunner = self.testRunner()
else:
# it is assumed to be a TestRunner instance
testRunner = self.testRunner
result = testRunner.run(self.test)
sys.exit(not result.wasSuccessful())
main = TestProgram
##############################################################################
# Executing this module from the command line
##############################################################################
if __name__ == "__main__":
main(module=None)
