Just fix the test code according Mockito advice:
```
org.mockito.exceptions.misusing.UnfinishedStubbingException:
Unfinished stubbing detected here:
-> at org.springframework.integration.samples.advance.testing.jms.JmsMockTests.verifyJmsMessageOnOutputChannel(JmsMockTests.java:153)
E.g. thenReturn() may be missing.
Examples of correct stubbing:
when(mock.isOk()).thenReturn(true);
when(mock.isOk()).thenThrow(exception);
doThrow(exception).when(mock).someVoidMethod();
Hints:
1. missing thenReturn()
2. you are trying to stub a final method, you naughty developer!
```
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