Python unittest.TestLoader() Examples

def test(coverage=False):
    """Run the unit tests."""
    if coverage and not os.environ.get('FLASK_COVERAGE'):
        import sys
        os.environ['FLASK_COVERAGE'] = '1'
        os.execvp(sys.executable, [sys.executable] + sys.argv)
    import unittest
    import xmlrunner
    tests = unittest.TestLoader().discover('tests')
    # run tests with unittest-xml-reporting and output to $CIRCLE_TEST_REPORTS on CircleCI or test-reports locally
    xmlrunner.XMLTestRunner(output=os.environ.get('CIRCLE_TEST_REPORTS','test-reports')).run(tests)
    if COV:
        COV.stop()
        COV.save()
        print('Coverage Summary:')
        COV.report()
        basedir = os.path.abspath(os.path.dirname(__file__))
        covdir = os.path.join(basedir, 'tmp/coverage')
        COV.html_report(directory=covdir)
        print('HTML version: file://%s/index.html' % covdir)
        COV.erase() 

def test_loadTestsFromNames__malformed_name(self):
        loader = unittest.TestLoader()

        # XXX Should this raise ValueError or ImportError?
        try:
            loader.loadTestsFromNames(['abc () //'])
        except ValueError:
            pass
        except ImportError:
            pass
        else:
            self.fail("TestLoader.loadTestsFromNames failed to raise ValueError")

    # "The specifier name is a ``dotted name'' that may resolve either to
    # a module, a test case class, a TestSuite instance, a test method
    # within a test case class, or a callable object which returns a
    # TestCase or TestSuite instance."
    #
    # What happens when no module can be found for the given name? 

def test_loadTestsFromTestCase__no_matches(self):
        class Foo(unittest.TestCase):
            def foo_bar(self): pass

        empty_suite = unittest.TestSuite()

        loader = unittest.TestLoader()
        self.assertEqual(loader.loadTestsFromTestCase(Foo), empty_suite)

    # "Return a suite of all tests cases contained in the TestCase-derived
    # class testCaseClass"
    #
    # What happens if loadTestsFromTestCase() is given an object
    # that isn't a subclass of TestCase? Specifically, what happens
    # if testCaseClass is a subclass of TestSuite?
    #
    # This is checked for specifically in the code, so we better add a
    # test for it. 

def test_sortTestMethodsUsing__default_value(self):
        loader = unittest.TestLoader()

        class Foo(unittest.TestCase):
            def test_2(self): pass
            def test_3(self): pass
            def test_1(self): pass

        test_names = ['test_2', 'test_3', 'test_1']
        self.assertEqual(loader.getTestCaseNames(Foo), sorted(test_names))


    # "it can be set to None to disable the sort."
    #
    # XXX How is this different from reassigning cmp? Are the tests returned
    # in a random order or something? This behaviour should die 

def test_loadTestsFromTestCase__TestSuite_subclass(self):
        class NotATestCase(unittest.TestSuite):
            pass

        loader = unittest.TestLoader()
        try:
            loader.loadTestsFromTestCase(NotATestCase)
        except TypeError:
            pass
        else:
            self.fail('Should raise TypeError')

    # "Return a suite of all tests cases contained in the TestCase-derived
    # class testCaseClass"
    #
    # Make sure loadTestsFromTestCase() picks up the default test method
    # name (as specified by TestCase), even though the method name does
    # not match the default TestLoader.testMethodPrefix string 

def test_sortTestMethodsUsing__loadTestsFromName(self):
        def reversed_cmp(x, y):
            return -((x > y) - (x < y))

        m = types.ModuleType('m')
        class Foo(unittest.TestCase):
            def test_1(self): pass
            def test_2(self): pass
        m.Foo = Foo

        loader = unittest.TestLoader()
        loader.sortTestMethodsUsing = reversed_cmp

        tests = loader.suiteClass([Foo('test_2'), Foo('test_1')])
        self.assertEqual(loader.loadTestsFromName('Foo', m), tests)

    # "Function to be used to compare method names when sorting them in
    # getTestCaseNames() and all the loadTestsFromX() methods" 

def test_loadTestsFromName__relative_TestCase_subclass(self):
        m = types.ModuleType('m')
        class MyTestCase(unittest.TestCase):
            def test(self):
                pass
        m.testcase_1 = MyTestCase

        loader = unittest.TestLoader()
        suite = loader.loadTestsFromName('testcase_1', m)
        self.assertIsInstance(suite, loader.suiteClass)
        self.assertEqual(list(suite), [MyTestCase('test')])

    # "The specifier name is a ``dotted name'' that may resolve either to
    # a module, a test case class, a TestSuite instance, a test method
    # within a test case class, or a callable object which returns a
    # TestCase or TestSuite instance." 

def test_sortTestMethodsUsing__loadTestsFromModule(self):
        def reversed_cmp(x, y):
            return -((x > y) - (x < y))

        m = types.ModuleType('m')
        class Foo(unittest.TestCase):
            def test_1(self): pass
            def test_2(self): pass
        m.Foo = Foo

        loader = unittest.TestLoader()
        loader.sortTestMethodsUsing = reversed_cmp

        tests = [loader.suiteClass([Foo('test_2'), Foo('test_1')])]
        self.assertEqual(list(loader.loadTestsFromModule(m)), tests)

    # "Function to be used to compare method names when sorting them in
    # getTestCaseNames() and all the loadTestsFromX() methods" 

def test_loadTestsFromName__relative_invalid_testmethod(self):
        m = types.ModuleType('m')
        class MyTestCase(unittest.TestCase):
            def test(self):
                pass
        m.testcase_1 = MyTestCase

        loader = unittest.TestLoader()
        try:
            loader.loadTestsFromName('testcase_1.testfoo', m)
        except AttributeError as e:
            self.assertEqual(str(e), "type object 'MyTestCase' has no attribute 'testfoo'")
        else:
            self.fail("Failed to raise AttributeError")

    # "The specifier name is a ``dotted name'' that may resolve ... to
    # ... a callable object which returns a ... TestSuite instance" 

def test_sortTestMethodsUsing__loadTestsFromTestCase(self):
        def reversed_cmp(x, y):
            return -((x > y) - (x < y))

        class Foo(unittest.TestCase):
            def test_1(self): pass
            def test_2(self): pass

        loader = unittest.TestLoader()
        loader.sortTestMethodsUsing = reversed_cmp

        tests = loader.suiteClass([Foo('test_2'), Foo('test_1')])
        self.assertEqual(loader.loadTestsFromTestCase(Foo), tests)

    # "Function to be used to compare method names when sorting them in
    # getTestCaseNames() and all the loadTestsFromX() methods" 

def test_loadTestsFromName__callable__TestCase_instance(self):
        m = types.ModuleType('m')
        testcase_1 = unittest.FunctionTestCase(lambda: None)
        def return_TestCase():
            return testcase_1
        m.return_TestCase = return_TestCase

        loader = unittest.TestLoader()
        suite = loader.loadTestsFromName('return_TestCase', m)
        self.assertIsInstance(suite, loader.suiteClass)
        self.assertEqual(list(suite), [testcase_1])

    # "The specifier name is a ``dotted name'' that may resolve ... to
    # ... a callable object which returns a TestCase ... instance"
    #*****************************************************************
    #Override the suiteClass attribute to ensure that the suiteClass
    #attribute is used 

def test_loadTestsFromName__callable__TestCase_instance_ProperSuiteClass(self):
        class SubTestSuite(unittest.TestSuite):
            pass
        m = types.ModuleType('m')
        testcase_1 = unittest.FunctionTestCase(lambda: None)
        def return_TestCase():
            return testcase_1
        m.return_TestCase = return_TestCase

        loader = unittest.TestLoader()
        loader.suiteClass = SubTestSuite
        suite = loader.loadTestsFromName('return_TestCase', m)
        self.assertIsInstance(suite, loader.suiteClass)
        self.assertEqual(list(suite), [testcase_1])

    # "The specifier name is a ``dotted name'' that may resolve ... to
    # ... a test method within a test case class"
    #*****************************************************************
    #Override the suiteClass attribute to ensure that the suiteClass
    #attribute is used 

def test_loadTestsFromName__relative_testmethod_ProperSuiteClass(self):
        class SubTestSuite(unittest.TestSuite):
            pass
        m = types.ModuleType('m')
        class MyTestCase(unittest.TestCase):
            def test(self):
                pass
        m.testcase_1 = MyTestCase

        loader = unittest.TestLoader()
        loader.suiteClass=SubTestSuite
        suite = loader.loadTestsFromName('testcase_1.test', m)
        self.assertIsInstance(suite, loader.suiteClass)

        self.assertEqual(list(suite), [MyTestCase('test')])

    # "The specifier name is a ``dotted name'' that may resolve ... to
    # ... a callable object which returns a TestCase or TestSuite instance"
    #
    # What happens if the callable returns something else? 

def test_testMethodPrefix__loadTestsFromName(self):
        m = types.ModuleType('m')
        class Foo(unittest.TestCase):
            def test_1(self): pass
            def test_2(self): pass
            def foo_bar(self): pass
        m.Foo = Foo

        tests_1 = unittest.TestSuite([Foo('foo_bar')])
        tests_2 = unittest.TestSuite([Foo('test_1'), Foo('test_2')])

        loader = unittest.TestLoader()
        loader.testMethodPrefix = 'foo'
        self.assertEqual(loader.loadTestsFromName('Foo', m), tests_1)

        loader.testMethodPrefix = 'test'
        self.assertEqual(loader.loadTestsFromName('Foo', m), tests_2)

    # "String giving the prefix of method names which will be interpreted as
    # test methods"
    #
    # Implicit in the documentation is that testMethodPrefix is respected by
    # all loadTestsFrom* methods. 

def test_testMethodPrefix__loadTestsFromModule(self):
        m = types.ModuleType('m')
        class Foo(unittest.TestCase):
            def test_1(self): pass
            def test_2(self): pass
            def foo_bar(self): pass
        m.Foo = Foo

        tests_1 = [unittest.TestSuite([Foo('foo_bar')])]
        tests_2 = [unittest.TestSuite([Foo('test_1'), Foo('test_2')])]

        loader = unittest.TestLoader()
        loader.testMethodPrefix = 'foo'
        self.assertEqual(list(loader.loadTestsFromModule(m)), tests_1)

        loader.testMethodPrefix = 'test'
        self.assertEqual(list(loader.loadTestsFromModule(m)), tests_2)

    # "String giving the prefix of method names which will be interpreted as
    # test methods"
    #
    # Implicit in the documentation is that testMethodPrefix is respected by
    # all loadTestsFrom* methods. 

def test_loadTestsFromNames__empty_name(self):
        loader = unittest.TestLoader()

        try:
            loader.loadTestsFromNames([''])
        except ValueError as e:
            self.assertEqual(str(e), "Empty module name")
        else:
            self.fail("TestLoader.loadTestsFromNames failed to raise ValueError")

    # "The specifier name is a ``dotted name'' that may resolve either to
    # a module, a test case class, a TestSuite instance, a test method
    # within a test case class, or a callable object which returns a
    # TestCase or TestSuite instance."
    #
    # What happens when presented with an impossible module name? 

def test_loadTestsFromName__relative_not_a_module(self):
        class MyTestCase(unittest.TestCase):
            def test(self):
                pass

        class NotAModule(object):
            test_2 = MyTestCase

        loader = unittest.TestLoader()
        suite = loader.loadTestsFromName('test_2', NotAModule)

        reference = [MyTestCase('test')]
        self.assertEqual(list(suite), reference)

    # "The specifier name is a ``dotted name'' that may resolve either to
    # a module, a test case class, a TestSuite instance, a test method
    # within a test case class, or a callable object which returns a
    # TestCase or TestSuite instance."
    #
    # Does it raise an exception if the name resolves to an invalid
    # object? 

def test_loadTestsFromNames__unknown_attr_name(self):
        loader = unittest.TestLoader()

        try:
            loader.loadTestsFromNames(['unittest.sdasfasfasdf', 'unittest'])
        except AttributeError as e:
            self.assertEqual(str(e), "'module' object has no attribute 'sdasfasfasdf'")
        else:
            self.fail("TestLoader.loadTestsFromNames failed to raise AttributeError")

    # "The specifier name is a ``dotted name'' that may resolve either to
    # a module, a test case class, a TestSuite instance, a test method
    # within a test case class, or a callable object which returns a
    # TestCase or TestSuite instance."
    # ...
    # "The method optionally resolves name relative to the given module"
    #
    # What happens when given an unknown attribute on a specified `module`
    # argument? 

def test_loadTestsFromNames__unknown_name_relative_1(self):
        loader = unittest.TestLoader()

        try:
            loader.loadTestsFromNames(['sdasfasfasdf'], unittest)
        except AttributeError as e:
            self.assertEqual(str(e), "'module' object has no attribute 'sdasfasfasdf'")
        else:
            self.fail("TestLoader.loadTestsFromName failed to raise AttributeError")

    # "The specifier name is a ``dotted name'' that may resolve either to
    # a module, a test case class, a TestSuite instance, a test method
    # within a test case class, or a callable object which returns a
    # TestCase or TestSuite instance."
    # ...
    # "The method optionally resolves name relative to the given module"
    #
    # Do unknown attributes (relative to a provided module) still raise an
    # exception even in the presence of valid attribute names? 

def test_loadTestsFromNames__unknown_name_relative_2(self):
        loader = unittest.TestLoader()

        try:
            loader.loadTestsFromNames(['TestCase', 'sdasfasfasdf'], unittest)
        except AttributeError as e:
            self.assertEqual(str(e), "'module' object has no attribute 'sdasfasfasdf'")
        else:
            self.fail("TestLoader.loadTestsFromName failed to raise AttributeError")

    # "The specifier name is a ``dotted name'' that may resolve either to
    # a module, a test case class, a TestSuite instance, a test method
    # within a test case class, or a callable object which returns a
    # TestCase or TestSuite instance."
    # ...
    # "The method optionally resolves name relative to the given module"
    #
    # What happens when faced with the empty string?
    #
    # XXX This currently raises AttributeError, though ValueError is probably
    # more appropriate 

def test_loadTestsFromNames__relative_empty_name(self):
        loader = unittest.TestLoader()

        try:
            loader.loadTestsFromNames([''], unittest)
        except AttributeError:
            pass
        else:
            self.fail("Failed to raise ValueError")

    # "The specifier name is a ``dotted name'' that may resolve either to
    # a module, a test case class, a TestSuite instance, a test method
    # within a test case class, or a callable object which returns a
    # TestCase or TestSuite instance."
    # ...
    # "The method optionally resolves name relative to the given module"
    #
    # What happens when presented with an impossible attribute name? 

def test_loadTestsFromNames__relative_malformed_name(self):
        loader = unittest.TestLoader()

        # XXX Should this raise AttributeError or ValueError?
        try:
            loader.loadTestsFromNames(['abc () //'], unittest)
        except AttributeError:
            pass
        except ValueError:
            pass
        else:
            self.fail("TestLoader.loadTestsFromNames failed to raise ValueError")

    # "The method optionally resolves name relative to the given module"
    #
    # Does loadTestsFromNames() make sure the provided `module` is in fact
    # a module?
    #
    # XXX This validation is currently not done. This flexibility should
    # either be documented or a TypeError should be raised. 

def test_testMethodPrefix__loadTestsFromTestCase(self):
        class Foo(unittest.TestCase):
            def test_1(self): pass
            def test_2(self): pass
            def foo_bar(self): pass

        tests_1 = unittest.TestSuite([Foo('foo_bar')])
        tests_2 = unittest.TestSuite([Foo('test_1'), Foo('test_2')])

        loader = unittest.TestLoader()
        loader.testMethodPrefix = 'foo'
        self.assertEqual(loader.loadTestsFromTestCase(Foo), tests_1)

        loader.testMethodPrefix = 'test'
        self.assertEqual(loader.loadTestsFromTestCase(Foo), tests_2)

    # "String giving the prefix of method names which will be interpreted as
    # test methods"
    #
    # Implicit in the documentation is that testMethodPrefix is respected by
    # all loadTestsFrom* methods. 

def test_loadTestsFromNames__relative_TestCase_subclass(self):
        m = types.ModuleType('m')
        class MyTestCase(unittest.TestCase):
            def test(self):
                pass
        m.testcase_1 = MyTestCase

        loader = unittest.TestLoader()
        suite = loader.loadTestsFromNames(['testcase_1'], m)
        self.assertIsInstance(suite, loader.suiteClass)

        expected = loader.suiteClass([MyTestCase('test')])
        self.assertEqual(list(suite), [expected])

    # "The specifier name is a ``dotted name'' that may resolve ... to
    # ... a TestSuite instance" 

def test_loadTestsFromNames__relative_testmethod(self):
        m = types.ModuleType('m')
        class MyTestCase(unittest.TestCase):
            def test(self):
                pass
        m.testcase_1 = MyTestCase

        loader = unittest.TestLoader()
        suite = loader.loadTestsFromNames(['testcase_1.test'], m)
        self.assertIsInstance(suite, loader.suiteClass)

        ref_suite = unittest.TestSuite([MyTestCase('test')])
        self.assertEqual(list(suite), [ref_suite])

    # "The specifier name is a ``dotted name'' that may resolve ... to ... a
    # test method within a test case class"
    #
    # Does the method gracefully handle names that initially look like they
    # resolve to "a test method within a test case class" but don't? 

def test_loadTestsFromNames__relative_invalid_testmethod(self):
        m = types.ModuleType('m')
        class MyTestCase(unittest.TestCase):
            def test(self):
                pass
        m.testcase_1 = MyTestCase

        loader = unittest.TestLoader()
        try:
            loader.loadTestsFromNames(['testcase_1.testfoo'], m)
        except AttributeError as e:
            self.assertEqual(str(e), "type object 'MyTestCase' has no attribute 'testfoo'")
        else:
            self.fail("Failed to raise AttributeError")

    # "The specifier name is a ``dotted name'' that may resolve ... to
    # ... a callable object which returns a ... TestSuite instance" 

def test_loadTestsFromNames__callable__TestCase_instance(self):
        m = types.ModuleType('m')
        testcase_1 = unittest.FunctionTestCase(lambda: None)
        def return_TestCase():
            return testcase_1
        m.return_TestCase = return_TestCase

        loader = unittest.TestLoader()
        suite = loader.loadTestsFromNames(['return_TestCase'], m)
        self.assertIsInstance(suite, loader.suiteClass)

        ref_suite = unittest.TestSuite([testcase_1])
        self.assertEqual(list(suite), [ref_suite])

    # "The specifier name is a ``dotted name'' that may resolve ... to
    # ... a callable object which returns a TestCase or TestSuite instance"
    #
    # Are staticmethods handled correctly? 

def test_loadTestsFromNames__callable__call_staticmethod(self):
        m = types.ModuleType('m')
        class Test1(unittest.TestCase):
            def test(self):
                pass

        testcase_1 = Test1('test')
        class Foo(unittest.TestCase):
            @staticmethod
            def foo():
                return testcase_1
        m.Foo = Foo

        loader = unittest.TestLoader()
        suite = loader.loadTestsFromNames(['Foo.foo'], m)
        self.assertIsInstance(suite, loader.suiteClass)

        ref_suite = unittest.TestSuite([testcase_1])
        self.assertEqual(list(suite), [ref_suite])

    # "The specifier name is a ``dotted name'' that may resolve ... to
    # ... a callable object which returns a TestCase or TestSuite instance"
    #
    # What happens when the callable returns something else? 

def test_loadTestsFromNames__callable__wrong_type(self):
        m = types.ModuleType('m')
        def return_wrong():
            return 6
        m.return_wrong = return_wrong

        loader = unittest.TestLoader()
        try:
            suite = loader.loadTestsFromNames(['return_wrong'], m)
        except TypeError:
            pass
        else:
            self.fail("TestLoader.loadTestsFromNames failed to raise TypeError")

    # "The specifier can refer to modules and packages which have not been
    # imported; they will be imported as a side-effect" 

def test_getTestCaseNames__not_a_TestCase(self):
        class BadCase(int):
            def test_foo(self):
                pass

        loader = unittest.TestLoader()
        names = loader.getTestCaseNames(BadCase)

        self.assertEqual(names, ['test_foo'])

    # "Return a sorted sequence of method names found within testCaseClass"
    #
    # Make sure inherited names are handled.
    #
    # TestP.foobar is defined to make sure getTestCaseNames() respects
    # loader.testMethodPrefix