Overview

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Powerful test doubles framework for Python

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a trivial example

import unittest
from doublex import Spy, assert_that, called

class SpyUseExample(unittest.TestCase):
    def test_spy_example(self):
        # given
        spy = Spy(SomeCollaboratorClass)
        cut = YourClassUnderTest(spy)

        # when
        cut.a_method_that_call_the_collaborator()

        # then
        assert_that(spy.some_method, called())

See more about doublex doubles.

Features

  • doubles have not public API framework methods. It could cause silent misspelling.
  • doubles do not require collaborator instances, just classes, and it never instantiate them.
  • assert_that() is used for ALL assertions.
  • mock invocation order is relevant by default.
  • supports old and new style classes.
  • supports Python versions: 2.6, 2.7, 3.2, 3.3, 3.4

Debian