The structure of the test set should be as follows:

• The TestRunner should start on a static instance of the RootLevelSuite defining the top level suite. This corresponds to a top level JUnit TestSuite statically returning a TestSuite instance.
• The RootLevelSuite should return a set of IntermediateLevelSuite's in it's suite methods. This corresponds to second level JUnit TestSuite statically returning a TestSuite instance..
• A IntermediateLevelSuite should return a set of CaseLevelSuite's in it's suite methods. This corresponds to a normal JUnit static call to a set of TestCases which returns their TestSuites.
• A CaseLevelSuite is composed of of a number of TestCase instances, each representing a single test.
• Each test is composed of a number test steps typically corresponding to a stimuli performed on the system.