| Protectable | A Protectable can be run and can throw a Throwable. |
| Test | A Test can be run and collect its results. |
| TestListener | A Listener for test progress |
| Assert | A set of assert methods. |
| ComparisonCompactor | |
| JUnit4TestAdapter | |
| JUnit4TestAdapterCache | |
| JUnit4TestCaseFacade | |
| TestCase | A test case defines the fixture to run multiple tests. |
| TestFailure | A TestFailure collects a failed test together with
the caught exception. |
| TestResult | A TestResult collects the results of executing
a test case. |
| TestSuite | A |
| AssertionFailedError | Thrown when an assertion failed. |
| ComparisonFailure | Thrown when an assert equals for Strings failed. |