gocept.testing 1.3

assertEllipsis

An assertion which is very helpful when using Testbrowser with unittest.TestCase (instead of doctests).

Some examples:

class MyTest(unittest.TestCase, gocept.testing.assertion.Ellipsis):
# [...]


self.assertEllipsis('...bar...', 'foo bar qux')
# -> nothing happens

self.assertEllipsis('foo', 'bar')
# -> AssertionError: Differences (ndiff with -expected +actual):
     - foo
     + bar

self.assertNotEllipsis('foo', 'foo')
# -> AssertionError: "Value unexpectedly matches expression 'foo'."

To use, inherit from gocept.testing.assertion.Ellipsis in addition to unittest.TestCase.

assertNothingRaised

The opposite of assertRaises(), this is an assertion that makes some tests more readable. As assertRaises(), it can be used as as context manager, too:

class MyTest(unittest.TestCase, gocept.testing.assertion.Exceptions):
# [...]

self.assertNothingRaised(do_something, 1, 2, 3)

with self.assertNothingRaised():
    do_something(1, 2, 3)

mock patch context

gocept.testing.mock.Patches collects mock patches that are valid for the whole TestCase, and resets them all in one go in tearDown (this is pending incluion upstream as mock.patcher(), see issue 30):

class MyTest(unittest.TestCase):

    def setUp(self):
        self.patches = gocept.testing.mock.Patches()

    def tearDown(self):
        self.patches.reset()

    def test_something(self):
        compile = self.patches.add('re.compile')

It offers three methods:

add:

wraps mock.patch()

add_object:

wraps mock.patch.object

add_dict:

wraps mock.patch.dict

Note that gocept.testing does not declare a dependency on mock to be as lightweight as possible, so clients need to do that themselves.

assertCalledWith

This is syntactic sugar around mock.assert_called_with, so you can write:

class MyTest(unittest.TestCase, gocept.testing.mock.Assertions):

    def test_something(self):
        dummy = mock.Mock()
        dummy(True)
        self.assertCalledWith(dummy, True)

instead of:

dummy.assert_called_with(True)

Mocking properties

gocept.testing.mock.Property is syntactic sugar directly lifted from the mock documentation that allows you to patch properties like this:

class Dummy(object):

    @property
    def foo(self):
        return False


with mock.patch('Dummy.foo', gocept.testing.mock.Property()) as foo:
    foo.return_value = 'something else'

Attribute patch context

This has nothing to do with mocks, it’s a convenience helper for setting and automatically resetting attributes of objects:

class MyTest(unittest.TestCase):

    def setUp(self):
        self.patches = gocept.testing.patch.Patches()
        self.subject = MyClass()

    def tearDown(self):
        self.patches.reset()

    def test_something(self):
        self.assertEqual('one', self.subject.foo)
        self.patches.set(self.subject, 'foo', 'two')
        self.assertEqual('two', self.subject.foo)

Method call patch context

This allows to call a method and reset it later on automatically. At the moment, only methods that take a single parameter are supported, by passing in both the new value and the old value (to which it should be reset):

class MyTest(unittest.TestCase):

    def setUp(self):
        self.patches = gocept.testing.patch.Patches()

    def tearDown(self):
        self.patches.reset()

    def test_something(self):
        self.patches.call(
            zope.component.hooks, 'setSite',
            my_site, zope.component.hooks.getSite())

Development

The source code is available in the mercurial repository at https://code.gocept.com/hg/public/gocept.testing

Please report any bugs you find at https://projects.gocept.com/projects/projects/gocept-testing/issues

Changelog