def test_expectation_passes_with_delta(self):
expectation = ChangeExpectation(lambda: self.foo, by=5)
self.foo = 5
expectation.enter()
self.foo = 10
expectation.exit()
self.assertTrue(expectation.passes)
self.assertRegexpMatches(
expectation.message,
r"changed by 5")
def test_expectation_fails_with_delta(self):
expectation = ChangeExpectation(lambda: self.foo, by=5)
self.foo = 5
expectation.enter()
self.foo = 40
expectation.exit()
self.assertFalse(expectation.passes)
self.assertRegexpMatches(
expectation.message,
r"did not change by 5")
def test_expectation_passes(self):
"""It should pass a callable that changes."""
expectation = ChangeExpectation(lambda: self.foo)
self.foo = 1
expectation.enter()
self.foo = 2
expectation.exit()
self.assertTrue(expectation.passes)
self.assertRegexpMatches(
expectation.message,
r"changed")
def test_expectation_fails(self):
"""It should reject a callable that does not change."""
expectation = ChangeExpectation(lambda: self.foo)
self.foo = 1
expectation.enter()
self.foo = 1
expectation.exit()
self.assertFalse(expectation.passes)
self.assertRegexpMatches(
expectation.message,
r"did not change")
