Here are a few title options for your article, emphasizing the question format: Short & Punchy: * @Mock, @MockBean, or Mockito.mock(): Which Mocking Strategy is Right for You? * Spring Boot Test

Understanding the Differences between @Mock, @MockBean, and Mockito.mock()

When developing tests and mocking dependencies, it's essential to understand the distinctions between three commonly used approaches: @MockBean, @Mock, and Mockito.mock().

Mockito vs. Spring Boot @MockBean

Mockito (classic/plain):

import org.mockito.Mock;<br>...<br>@Mock<br>MyService myservice;<br>

import org.mockito.Mockito;<br>...<br>MyService myservice = Mockito.mock(MyService.class);<br>

Mockito uses annotations and provides a direct way to mock classes or interfaces.

Spring Boot @MockBean:

import org.springframework.boot.test.mock.mockito.MockBean;<br>...<br>@MockBean<br>MyService myservice;<br>

Spring Boot's @MockBean is an annotation used specifically within the Spring Boot framework.

Difference:

• Mockito allows you to mock dependencies for unit tests, while @MockBean adds mocks to the Spring ApplicationContext.
• @MockBean replaces or adds the mock to the context based on existing bean definitions, while Mockito does not interact with Spring.

When to Use:

• Use Mockito when testing components in isolation from the Spring container.
• Use @MockBean when the test requires interaction with the Spring container and mocking specific beans within it.

Mockito.mock() vs. @Mock @MockBean

Both @Mock (from Mockito) and @MockBean (from Spring Boot) are used for mocking, but there are subtle differences:

• @Mock: A Mockito annotation used for mocking within unit tests.
• @MockBean: A Spring Boot annotation used for mocking within Spring ApplicationContext.

Functionally, they both achieve the same result, so the decision of which to use depends on the specific test requirements.

Practical Usage

Unit Test without Spring Context:

@Mock<br>MyService myservice;<br>

Unit Test with Spring Context and Bean Overriding:

@MockBean<br>MyService myservice;<br>

Adding Mocks to Spring WebMvc Test:

@WebMvcTest(FooController.class)<br>@MockBean<br>FooService fooServiceMock;<br>

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