title: Powermock/mockito does not throw exception when told to
body: <p>I would have assumed that the following test should pass, but the exception is never thrown. Any clues ? </p>
  
  <pre><code>@RunWith(PowerMockRunner.class)
  @PrepareForTest(StaticService.class)
  public class TestStuff {
  
      @Test(expected = IllegalArgumentException.class)
      public void testMockStatic() throws Exception {
          mockStatic(StaticService.class);
          doThrow(new IllegalArgumentException("Mockerror")).when(StaticService.say("hello"));
          verifyStatic();
          StaticService.say("hello");
  }
  </code></pre>
  
  <p>}</p>