gocept.testing 1.2

A collection of test helpers, additional assertions, and the like.

This package collects various helpers for writing tests.

Contents

• assertEllipsis

• assertNothingRaised

• mock patch context

• assertCalledWith

• Mocking properties

• Development

• Changelog

assertEllipsis

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

Some examples:

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:

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'

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

1.2 (2011-12-09)

• Add Patches context for mock (upstream implementation pending, see <http://code.google.com/p/mock/issues/detail?id=30>)

• Add assertCalledWith.

• Add mock.Property.

1.1 (2011-11-10)

• Add assertNothingRaised.

1.0 (2011-11-02)

• first release: assertEllipsis