title: Mockito refuses to throw checked exception
body: <p>I'm using Mockito for my unit tests and I encounetered a problem with throwing exception on spied object. I have done this before on this object (in different test case and it worked).
  Here's the test code:  </p>
  
  <pre><code>@Test
  public void callInitiated_FsmInitializationException() throws FsmInitializationException, Exception {
      MocSbb moc = Mockito.spy(testObj);
  
      MocTracer tracer = Mockito.mock(MocTracer.class);
      Mockito.doReturn(tracer).when(moc).getTracer();
  
      CAP2InitialDPArg idp = Mockito.mock(CAP2InitialDPArg.class);
      MocFsm mocFsm = Mockito.mock(MocFsm.class);
      //Mockito.doReturn(mocFsm).when(moc).getSs7Fsm();
  
      TicketingLocalInterface ticketing = mockTicketingLocalInterface();
      CAP2InitialDPArgWrap idpWrap = Mockito.mock(CAP2InitialDPArgWrap.class);
      PowerMockito.whenNew(CAP2InitialDPArgWrap.class).withArguments(idp, tracer).thenReturn(idpWrap);
  
      MocSession mocSession = Mockito.mock(MocSession.class);
      Mockito.doReturn(mocSession).when(moc).getMocSession();
  
      Mockito.when(moc.getSs7Fsm()).thenThrow(new FsmInitializationException()); ////HERE'S THE PROBLEM
  
      moc.callInitiated(idp);
  
      verify(moc).getFailedFsm();
  } 
  </code></pre>
  
  <p>here's the method on which the exception should be thrown: </p>
  
  <pre><code>protected MocFsm getSs7Fsm() throws FsmInitializationException {
      mocFsm.setContextProvider(getMocLocalObject());
      return mocFsm;
  }  
  </code></pre>
  
  <p>the error I get during test execution looks like this:</p>
  
  <pre><code>Testcase: callInitiated_FsmInitializationException(com.nsn.as.ccs.moc.sbb.MocSbbTest):  Caused an ERROR
  
  Checked exception is invalid for this method!
  Invalid: com.nsn.as.ccs.moc.fsm.FsmInitializationException
  org.mockito.exceptions.base.MockitoException: 
  Checked exception is invalid for this method!
  Invalid: com.nsn.as.ccs.moc.fsm.FsmInitializationException
  at com.nsn.as.ccs.moc.sbb.MocSbbTest.callInitiated_FsmInitializationException(MocSbbTest.java:1194)
  at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:322)
  at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:309)
  at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:112)
  at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:73)
  at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:297)
  at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:222)
  at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:161)
  at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:135)
  at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:133)
  at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:112)
  at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:57)  
  </code></pre>
  
  <p>Does anyone have any idea why it doesn't work in this case?</p>