@Test
public void executeShouldOutputMessage() throws Exception {

    new ReflectionHelper(echoMojo).setField("message", "Björn");
    new ReflectionHelper(echoMojo, AbstractMojo.class).setField(pluginLogMock);
    echoMojo.execute();
    verify(pluginLogMock).info("Björn");
    verifyNoMoreInteractions(pluginLogMock);
}