Bike b = store.getNewBikeFromQueue();
assertEquals("Ventana", b.getManufacturer());
assertEquals("El Chamuco", b.getModel());
b = store.getNewBikeFromQueue();
assertEquals("Ventana", b.getManufacturer());
assertEquals("La Bruja", b.getModel());
b = store.getNewBikeFromQueue();
assertNull(b);