@Test
public void testDecrementSpeed() throws Exception {
double expected = 0;
saab.currentSpeed = 2.5;
saab.decrementSpeed(2);
double actual = saab.currentSpeed;
assertEquals(expected, actual, 0.0001);
}
@Test
public void testSetTubroOff() throws Exception {
boolean expected = false;
saab.setTurboOff();
boolean actual = saab.turboOn;
assertEquals(expected, actual);
}