Assert

From Declaring a TestCase, Asserts:

The first argument is a message and is optionally followed by expected and actual values:

fail([msg])
assertTrue([msg], actual)
assertFalse([msg], actual)
assertEquals([msg], expected, actual)
assertSame([msg], expected, actual)
assertNotSame([msg], expected, actual)
assertNull([msg], actual)
assertNotNull([msg], actual)