How to write an Unit Test for Command

Step I Test preparation: Initialize the mocked Rainbow

@Before
public void setUp() {
    /*Initialze the RainbowMocker we provide to mock the rainbow instance*/
    RainbowMocker.injectRainbow();
}

Step II Write test case for the Command

1. Construct Command from the CommandFactory for the target system

Here is an example for setting up the SetLoadCmd for ZNNCommandFactory. You should specify the acme file to load.

StandaloneResource resource = StandaloneResourceProvider.instance().acmeResourceForString(
"src/test/resources/acme/znn.acme");
IAcmeSystem sys = resource.getModel().getSystems().iterator().next();
assertTrue(sys.getDeclaredTypes().iterator().next().isSatisfied());
ZNNModelUpdateOperatorsImpl znn = new ZNNModelUpdateOperatorsImpl(sys, "src/test/resources/acme/znn.acme");
IAcmeComponent server = sys.getComponent("s0");
/*For different type of command you call different 'set' method*/
AcmeModelOperation cns = znn.getCommandFactory().setLoadCmd(server, (float) 0.32);

2. Run the SetLoadCmd

Here you need to use the mocked announce port we provide to execute the command. This should work for all the commands that need the IModelChangeBusPort.

/*Use the mockAnnouncePort*/
IModelChangeBusPort announcePort = mockAnnouncePort();
assertTrue(cns.canExecute());
List<? extends IRainbowMessage> generatedEvents = cns.execute(znn, announcePort);

3. You can now assert and print the output

assertTrue(cns.canUndo());
assertFalse(cns.canExecute());
assertFalse(cns.canRedo());
outputMessages(generatedEvents);
checkEventProperties(generatedEvents);

Here is an example function for printing the output.

private void outputMessages(List<? extends IRainbowMessage> events) {
    for (IRainbowMessage msg : events) {
      System.out.println(msg.toString());
    }
}

Here is an example function to check the properties of the generated events.

private void checkEventProperties(List<? extends IRainbowMessage> generatedEvents) {
  	assertTrue(generatedEvents.size() > 0);
 assertTrue(generatedEvents.iterator().next().getProperty(IModelChangeBusPort.EVENT_TYPE_PROP).equals(CommandEventT.START_COMMAND.name()));
  assertTrue(generatedEvents.get(generatedEvents.size() - 1).getProperty(IModelChangeBusPort.EVENT_TYPE_PROP).equals(CommandEventT.FINISH_COMMAND.name()));
    for (IRainbowMessage msg : generatedEvents) {
      assertTrue(msg.getPropertyNames().contains(ESEBConstants.MSG_TYPE_KEY));
    }
}