GWT [ERROR] No source code is available for ...GWTTestCase

Problem :


You have the following error:
[ERROR] Line 11: No source code is available for type com.google.gwt.junit.client.GWTTestCase;
did you forget to inherit a required module?


Solution :

In your module file(*.gwt.xml), simply add :
"< name="com.google.gwt.junit.JUnit">"