@SuppressWarnings("JUnitTestMethodWithNoAssertions")
@Test
public void testUnknownArgument() {

    LOG.info("testUnknownArgument");
    // Initialize Mockito.
    MockitoAnnotations.initMocks(this);
    MainCommandLine.execute("--help", "unknown");
    MainCommandLine.execute("--unknown");
    MainCommandLine.execute("--port");
}