14. unittest Assert Methods

The TestCase class provides several assert methods to check for and report failures. The following are the most commonly used methods:

* assertEqual(first, second, msg=None)

  Test that first and second are equal. If the values do not compare equal, the test will fail.

* assertNotEqual(first, second, msg=None)

  Test that first and second are not equal. If the values do compare equal, the test will fail.

* assertTrue(expr, msg=None)

* assertFalse(expr, msg=None)

  Test that expr is true (or false).

* assertIs(first, second, msg=None)

* assertIsNot(first, second, msg=None)

  Test that first and second evaluate (or don’t evaluate) to the same object.

* assertIsNone(expr, msg=None)

* assertIsNotNone(expr, msg=None)

  Test that expr is (or is not) None.

* assertIn(first, second, msg=None)

* assertNotIn(first, second, msg=None)

  Test that first is (or is not) in second.

* assertIsInstance(obj, cls, msg=None)

* assertNotIsInstance(obj, cls, msg=None)

  Test that obj is (or is not) an instance of cls (which can be a class or a tuple of classes, as supported by             
  isinstance()). To check for the exact type, use assertIs(type(obj), cls).