9.4 Test Assert Methods

     

9.4 Test Assert Methods

PyUnit provides 18 test assert methods. Many of them are aliases for the same methods. Most take an optional descriptive message argument, which is reported in case of test failure.

The test assert methods are defined within the class TestCase and are described in the following list. Their first argument, self , is a reference to the TestCase instance. When invoking these methods within a test method, this argument is implicit and does not need to be passed.


assert_(self, expr, msg=None)

failUnless(self, expr, msg=None)

Test passes if expr is true . This is the most generic assert method.


assertEqual(self, first, second, msg=None)

assertEquals(self, first, second, msg=None)

failUnlessEqual(self, first, second, msg=None)

Test passes if first and second are equal when compared using == .


assertNotEqual(self, first, second, msg=None)

assertNotEquals(self, first, second, msg=None)

failIfEqual(self, first, second, msg=None)

Test fails if first and second are equal when compared using == .


assertAlmostEqual(self, first, second, places=7, msg=None)

assertAlmostEquals(self, first, second, places=7, msg=None)

failUnlessAlmostEqual(self, first, second, places=7, msg=None)

Test passes if first and second are equal after being rounded to places decimal places.


assertNotAlmostEqual(self, first, second, places=7, msg=None)

assertNotAlmostEquals(self, first, second, places=7, msg=None)

failIfAlmostEqual(self, first, second, places=7, msg=None)

Test fails if first and second are equal after being rounded to places decimal places.


assertRaises(self, excClass, callableObj, *args, **kwargs)

failUnlessRaises(self, excClass, callableObj, *args, **kwargs)

Call callableObj with arguments args and keyword arguments kwargs . This assert passes if an exception of type excClass is thrown.


fail(self, msg=None)

Test assert that always fails.


failIf(self, expr, msg=None)

Test fails if expr is true .



Unit Test Frameworks
Unit Test Frameworks
ISBN: 0596006896
EAN: 2147483647
Year: 2006
Pages: 146
Authors: Paul Hamill

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