java-tutorials/mockito-mocks-spring-beans/src/test/java/com/baeldung/UserServiceTest.java

package com.baeldung;

import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.SpringApplicationConfiguration;
import org.springframework.test.context.ActiveProfiles;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@ActiveProfiles("test")
@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = MocksApplication.class)
public class UserServiceTest {

    @Autowired
    private UserService userService;

    @Autowired
    private NameService nameService;

    @Test
    public void whenUserIdIsProvided_thenRetrievedNameIsCorrect() {
        Mockito.when(nameService.getUserName("SomeId")).thenReturn("Baeldung");

        String testName = userService.getUserName("SomeId");

        Assert.assertEquals("Baeldung", testName);
    }
}