#!/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.assertEquals((1 + 2), 3) self.assertEquals(0 + 1, 1) def testMultiply(self): self.assertEquals((0 * 10), 0) self.assertEquals((5 * 8), 40) if __name__ == '__main__': unittest.main() Further information is available in the bundled documentation, and from http://docs.python.org/lib/module-unittest.html Copyright (c) 1999-2003 Steve Purcell 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. ''' __author__ = "Steve Purcell" __email__ = "stephen_purcell at yahoo dot com" __version__ = "#Revision: 1.63 $"[11:-2] import time import sys import traceback import os import types ############################################################################## # Exported classes and functions ############################################################################## __all__ = ['TestResult', 'TestCase', 'TestSuite', 'TextTestRunner', 'TestLoader', 'FunctionTestCase', 'main', 'defaultTestLoader'] # Expose obsolete functions for backwards compatibility __all__.extend(['getTestCaseNames', 'makeSuite', 'findTestCases']) ############################################################################## # Backward compatibility ############################################################################## def _CmpToKey(mycmp): 'Convert a cmp= function into a key= function' class K(object): def __init__(self, obj): self.obj = obj def __lt__(self, other): return mycmp(self.obj, other.obj) == -1 return K ############################################################################## # Test framework core ############################################################################## def _strclass(cls): return "%s.%s" % (cls.__module__, cls.__name__) __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.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 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): def __init__(self, expected, test_case): self.expected = expected self.failureException = test_case.failureException 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) raise self.failureException( "{0} not raised".format(exc_name)) if issubclass(exc_type, self.expected): return True # Let unexpected exceptions skip through return False 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 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. """ try: self._testMethodName = methodName testMethod = getattr(self, methodName) self._testMethodDoc = testMethod.__doc__ except AttributeError: raise ValueError("no such test method in %s: %s" % \ (self.__class__, methodName)) 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 a one-line description of the test, or None if no description has been provided. The default implementation of this method returns the first line of the specified test method's docstring. """ doc = self._testMethodDoc return doc and doc.split("\n")[0].strip() or None def id(self): return "%s.%s" % (_strclass(self.__class__), self._testMethodName) def __eq__(self, other): if type(self) is not type(other): return False 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 Exception: result.addError(self, self._exc_info()) return ok = False try: testMethod() ok = True except self.failureException: result.addFailure(self, self._exc_info()) except Exception: result.addError(self, self._exc_info()) try: self.tearDown() except Exception: result.addError(self, self._exc_info()) ok = False if ok: 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 _exc_info(self): """Return a version of sys.exc_info() with the traceback frame minimised; usually the top level of the traceback frame is not needed. """ return sys.exc_info() def fail(self, msg=None): """Fail immediately, with the given message.""" raise self.failureException(msg) def failIf(self, expr, msg=None): "Fail the test if the expression is true." if expr: raise self.failureException(msg) def failUnless(self, expr, msg=None): """Fail the test unless the expression is true.""" if not expr: raise self.failureException(msg) def failUnlessRaises(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.failUnlessRaises(some_error_class): do_something() """ context = AssertRaisesContext(excClass, self) if callableObj is None: return context with context: callableObj(*args, **kwargs) def failUnlessEqual(self, first, second, msg=None): """Fail if the two objects are unequal as determined by the '==' operator. """ if not first == second: raise self.failureException(msg or '%r != %r' % (first, second)) def failIfEqual(self, first, second, msg=None): """Fail if the two objects are equal as determined by the '==' operator. """ if first == second: raise self.failureException(msg or '%r == %r' % (first, second)) def failUnlessAlmostEqual(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: raise self.failureException( msg or '%r != %r within %r places' % (first, second, places)) def failIfAlmostEqual(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: raise self.failureException( msg or '%r == %r within %r places' % (first, second, places)) # Synonyms for assertion methods assertEqual = assertEquals = failUnlessEqual assertNotEqual = assertNotEquals = failIfEqual assertAlmostEqual = assertAlmostEquals = failUnlessAlmostEqual assertNotAlmostEqual = assertNotAlmostEquals = failIfAlmostEqual assertRaises = failUnlessRaises assert_ = assertTrue = failUnless assertFalse = failIf 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) __str__ = __repr__ def __eq__(self, other): if type(self) is not type(other): return False return self._tests == other._tests def __ne__(self, other): return not self == other # Can't guarantee hash invariant, so flag as unhashable __hash__ = None 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, types.ClassType)) 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, basestring): 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 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): TestCase.__init__(self) 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 type(self) is not type(other): return False 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 ############################################################################## class TestLoader(object): """This class is responsible for loading tests according to various criteria and returning them wrapped in a TestSuite """ testMethodPrefix = 'test' sortTestMethodsUsing = cmp suiteClass = TestSuite 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'] return self.suiteClass(map(testCaseClass, testCaseNames)) 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, types.ClassType)) 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, types.ClassType)) and issubclass(obj, TestCase)): return self.loadTestsFromTestCase(obj) elif (isinstance(obj, types.UnboundMethodType) and isinstance(parent, (type, types.ClassType)) and issubclass(parent, TestCase)): return TestSuite([parent(obj.__name__)]) elif isinstance(obj, TestSuite): return obj elif 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 = 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=cmp): return _makeLoader(prefix, sortUsing).getTestCaseNames(testCaseClass) def makeSuite(testCaseClass, prefix='test', sortUsing=cmp, suiteClass=TestSuite): return _makeLoader(prefix, sortUsing, suiteClass).loadTestsFromTestCase(testCaseClass) def findTestCases(module, prefix='test', sortUsing=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): TestResult.__init__(self) 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): TestResult.startTest(self, test) if self.showAll: self.stream.write(self.getDescription(test)) self.stream.write(" ... ") self.stream.flush() def addSuccess(self, test): TestResult.addSuccess(self, test) if self.showAll: self.stream.writeln("ok") elif self.dots: self.stream.write('.') self.stream.flush() def addError(self, test, err): TestResult.addError(self, test, err) if self.showAll: self.stream.writeln("ERROR") elif self.dots: self.stream.write('E') self.stream.flush() def addFailure(self, test, err): TestResult.addFailure(self, test, err) if self.showAll: self.stream.writeln("FAIL") elif self.dots: self.stream.write('F') 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() if not result.wasSuccessful(): self.stream.write("FAILED (") failed, errored = map(len, (result.failures, result.errors)) if failed: self.stream.write("failures=%d" % failed) if errored: if failed: self.stream.write(", ") self.stream.write("errors=%d" % errored) self.stream.writeln(")") else: self.stream.writeln("OK") 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, basestring): 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 try: options, args = getopt.getopt(argv[1:], 'hHvq', ['help','verbose','quiet']) 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, msg: self.usageExit(msg) def createTests(self): self.test = self.testLoader.loadTestsFromNames(self.testNames, self.module) def runTests(self): if isinstance(self.testRunner, (type, types.ClassType)): 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) 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