TestAndGate.java

public class TestAndGate {

    private IC<?> create(PinSet3ISO pinSet) {
        return new AndGateImpl(pinSet);
    }

    public void testAndGate(Boolean in1, Boolean in2, Boolean in3, Boolean expected) {
        Dummy3ISO dummyPinSet = new Dummy3ISO();
        dummyPinSet.FRONT_INPUT.setState(in1);
        dummyPinSet.LEFT_INPUT.setState(in2);
        dummyPinSet.RIGHT_INPUT.setState(in3);
        IC<?> ic = create(dummyPinSet);

        ic.trigger();

        Assertions.assertEquals(expected, dummyPinSet.OUTPUT.getState(), "expected " + Arrays.asList(in1, in2, in3) + " to give output " + expected + " but got: " + dummyPinSet.OUTPUT.getState());
    }

    @Test
    public void testNoPins() {
        testAndGate(null, null, null, true);
    }

    @Test
    public void testOnePinOn() {
        testAndGate(true, null, null, true);
        testAndGate(null, true, null, true);
        testAndGate(null, null, true, true);
    }

    @Test
    public void testTwoPinsOn() {
        testAndGate(true, true, null, true);
        testAndGate(true, null, true, true);
        testAndGate(null, true, true, true);
    }

    @Test
    public void testThreePinsOn() {
        testAndGate(true, true, true, true);
    }

    @Test
    public void testAllPinsOff() {
        testAndGate(false, false, false, false);
    }

    @Test
    public void testOnePinOff() {
        testAndGate(false, null, null, false);
        testAndGate(null, false, null, false);
        testAndGate(null, null, false, false);
    }

    @Test
    public void testTwoMixed() {
        testAndGate(true, false, null, false);
        testAndGate(false, true, null, false);
        testAndGate(null, true, false, false);
        testAndGate(null, false, true, false);
    }

    @Test
    public void testThreeMixed() {
        testAndGate(false, true, true, false);
        testAndGate(true, false, true, false);
        testAndGate(true, true, false, false);

        testAndGate(true, false, false, false);
        testAndGate(false, true, false, false);
        testAndGate(false, true, false, false);
    }
}