maven work

spring-mockito/src/main/java/com/baeldung/MocksApplication.java

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+package com.baeldung;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class MocksApplication {
+	public static void main(String[] args) {
+		SpringApplication.run(MocksApplication.class, args);
+	}
+}

spring-mockito/src/main/java/com/baeldung/NameService.java

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+package com.baeldung;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class NameService {
+    public String getUserName(String id) {
+        return "Real user name";
+    }
+}

spring-mockito/src/main/java/com/baeldung/UserService.java

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+package com.baeldung;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class UserService {
+
+    private NameService nameService;
+
+    @Autowired
+    public UserService(NameService nameService) {
+        this.nameService = nameService;
+    }
+
+    public String getUserName(String id) {
+        return nameService.getUserName(id);
+    }
+}

spring-mockito/src/test/java/com/baeldung/NameServiceTestConfiguration.java

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+package com.baeldung;
+
+import org.mockito.Mockito;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+import org.springframework.context.annotation.Profile;
+
+@Profile("test")
+@Configuration
+public class NameServiceTestConfiguration {
+    @Bean
+    @Primary
+    public NameService nameService() {
+        return Mockito.mock(NameService.class);
+    }
+}

spring-mockito/src/test/java/com/baeldung/UserServiceTest.java

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+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("Mock user name");
+
+        String testName = userService.getUserName("SomeId");
+
+        Assert.assertEquals("Mock user name", testName);
+    }
+}