This class is responsible for hosting JUnit test case execution. There are
three main pieces to the JUnit system.
Test environment
Client classes
Server classes
The test environment consists of this class and the non-translatable version
of
com.google.gwt.junit.client.GWTTestCase . These two classes
integrate directly into the real JUnit test process.
Overrides the default module loading behavior. Clears any existing entry
points and adds an entry point for the class being tested. This test class
is then rebound to a generated subclass.