OrderApplicationTest.java

package com.example.unit.testing.application;

import ...;

public class OrderApplicationTest {
	
	@Mock
	CustomerRepository customerRepository;
	
	@Mock
	OrderRepository orderRepository;
	
	@Mock
	PaymentValidationService paymentValidationService;
	
	@InjectMocks
	OrderApplication orderApplication = new OrderApplication();
	
	@Before
	public void setUp() {
		MockitoAnnotations.initMocks(this);
	}
	
	@Test
	public void placeOrderTest() {
		
		Order o = mock(Order.class);
		when(o.calculateAmount()).thenReturn(10.0);
		
		Customer customerMock = mock(Customer.class);
		when(customerMock.placeOrder(0L)).thenReturn(o);
		
		when(customerRepository.findOne(0L)).thenReturn(customerMock);
		
		when(paymentValidationService.verifyCreditCardPayment("123", 10.0)).thenReturn(true);
		
		Long result = orderApplication.placeOrder(0L, 0L, "123");
		
		verify(customerRepository).save(customerMock);
		verify(orderRepository).save(o);
		
		assertThat(result).isEqualTo(0l);
	}
	
	@Test
	public void getOrderStatusTest() {
		
		Order o = mock(Order.class);
		when(o.getStatus()).thenReturn("IN PROGRESS");
		
		when(orderRepository.findOne(0L)).thenReturn(o);
		
		String result = orderApplication.getOrderStatus(0L);
		
		assertThat(result).isEqualTo("IN PROGRESS");
	}
}