Example, making JUnit read a little more like Rspec

blog-junit-solution.java

// Describe: the TripRequest model
@RunWith(HierarchicalContextRunner.class)
public class TripRequestTest {
    static Instant now;
    static Instant past;
    static Instant future;

    TimeSlot timeSlotNow;
    TimeSlot timeSlotPast;
    TimeSlot timeSlotFuture;

    @BeforeClass
    public static void setupClass() {
        now = Instant.now();
        past = now.minus(10, ChronoUnit.MINUTES);
        future = now.plus(10, ChronoUnit.MINUTES);
    }

    // Create time slots
    @Before
    public void setup() {
        timeSlotNow = MockTimeSlot.generateTimeSlot(now);
        timeSlotPast = MockTimeSlot.generateTimeSlot(past);
        timeSlotFuture = MockTimeSlot.generateTimeSlot(future);
    }

    // Context getFirstTimeSlot()
    public class Method_getFirstTimeSlot {
        TripRequest request;

        @Test
        public void givenNoTimeSlots_returnNull() {
            request = new TripRequest();
            assertThat(request.getFirstTimeSlot(), Matchers.nullValue());
        }

        @Test
        public void givenOneTimeSlot_returnsTimeSlot() {
            request = new TripRequest();
            request.addTimeSlot(timeSlotNow);
            assertEquals(request.getFirstTimeSlot(), timeSlotNow);
        }

        @Test
        public void givenMultipleTimeSlots_returnsFirst() {
            request = new TripRequest();
            request.setTimeSlots(Lists.newArrayList(timeSlotNow, timeSlotPast, timeSlotFuture));

            assertEquals(request.getFirstTimeSlot(), timeSlotPast);
        }
    }
}