Add tests for Lab model

What does this mr do?

This MR adds tests for the Lab model

src/test/java/nl/tudelft/ewi/queue/model/LabTest.java

@@ -654,4 +654,49 @@ public class LabTest {
 		assertThat(tempLab.position(user)).isEqualTo("00:00 - 01:00");
 	}
 
+	@Test
+	public void slotIsAvailableTrue() {
+		Course course = courseRepository.findByIdOrThrow(1L);
+		Lab tempLab = new Lab(course, new LabSlot(LocalDateTime.now(), LocalDateTime.now().plusHours(4)), lab.getRooms(), true);
+		tempLab.setCapacity(1L);
+		RequestSlot requestSlot = new RequestSlot(LocalDateTime.now().plusMinutes(15), LocalDateTime.now().plusMinutes(30));
+		assertThat(tempLab.slotIsAvailable(requestSlot)).isTrue();
+	}
+
+	@Test
+	public void slotIsAvailableTooSmallCapacity() {
+		Course course = courseRepository.findByIdOrThrow(1L);
+		Lab tempLab = new Lab(course, new LabSlot(LocalDateTime.now(), LocalDateTime.now().plusHours(4)), lab.getRooms(), true);
+		tempLab.setCapacity(0L);
+		RequestSlot requestSlot = new RequestSlot(LocalDateTime.now().plusMinutes(15), LocalDateTime.now().plusMinutes(30));
+		assertThat(tempLab.slotIsAvailable(requestSlot)).isFalse();
+	}
+
+	@Test
+	public void slotIsAvailableAlreadyStarted() {
+		Course course = courseRepository.findByIdOrThrow(1L);
+		Lab tempLab = new Lab(course, new LabSlot(LocalDateTime.now(), LocalDateTime.now().plusHours(4)), lab.getRooms(), true);
+		tempLab.setCapacity(1L);
+		RequestSlot requestSlot = new RequestSlot(LocalDateTime.now(), LocalDateTime.now().plusMinutes(15));
+		assertThat(tempLab.slotIsAvailable(requestSlot)).isFalse();
+	}
+
+	@Test
+	public void slotIsAvailableBeforeOpening() {
+		Course course = courseRepository.findByIdOrThrow(1L);
+		Lab tempLab = new Lab(course, new LabSlot(LocalDateTime.now(), LocalDateTime.now().plusHours(4)), lab.getRooms(), true);
+		tempLab.setCapacity(1L);
+		RequestSlot requestSlot = new RequestSlot(LocalDateTime.now().minusMinutes(1), LocalDateTime.now().minusMinutes(5));
+		assertThat(tempLab.slotIsAvailable(requestSlot)).isTrue();
+	}
+
+	@Test
+	public void slotIsAvailableBeforeGracePeriod() {
+		Course course = courseRepository.findByIdOrThrow(1L);
+		Lab tempLab = new Lab(course, new LabSlot(LocalDateTime.now(), LocalDateTime.now().plusHours(4)), lab.getRooms(), true);
+		tempLab.setCapacity(1L);
+		RequestSlot requestSlot = new RequestSlot(LocalDateTime.now().minusMinutes(3), LocalDateTime.now());
+		assertThat(tempLab.slotIsAvailable(requestSlot)).isFalse();
+	}
+
 }