title: GWTTestCase gave me an error
body: <p>I write simple test using GWTTestCase, here is:</p>
  
  <pre><code>public class SampleTest extends GWTTestCase {
  
      @Override
      public String getModuleName() {
          return "path.to.my.one.and.only.Module";
      }
  
      public void testSome() {
          assertNotNull(null);
      }
  }
  </code></pre>
  
  <p>But when I run <strong>mvn test</strong>, the test failed with next error:</p>
  
  <pre><code>[ERROR] Unable to find type 'java.lang.Object'
     [ERROR] Hint: Check that your module inherits 'com.google.gwt.core.Core' either directly or indirectly (most often by inheriting module 'com.google.gwt.user.User')
  Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 3.648 sec &lt;&lt;&lt; FAILURE!
  </code></pre>
  
  <p>I have 'com.google.gwt.user.User' in my module.</p>