What Can You assert?
assertTrue
( gcd(-3,-5) > 0 )
assertFalse
( "hello".isupper() )
assertEqual
( 2*2, 4)
assertNotEqual
( "a", "b")
assertIsNone
(a)
# test "a is None"
assertIsNotNone
(a)
# test "a is not None"
assertIn
( a, list)
# test "a in list"
assertIsInstance
(3, int)
# test isinstance(a,b)
assertListEqual
( list1, list2 )
# all elments equal
Many more!
See "unittest" in the Python Library docs.