You want to test a controller OrderController that depends on a service OrderService. Using @WebMvcTest, how can you provide a mock OrderService to the controller during testing?

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Spring Boot - Testing Spring Boot Applications

You want to test a controller OrderController that depends on a service OrderService. Using @WebMvcTest, how can you provide a mock OrderService to the controller during testing?

ACreate a new OrderService instance manually in the test method

BUse @Autowired on OrderService field to inject real service

CUse @MockBean on OrderService field in the test class to inject a mock

DUse @SpringBootTest instead of @WebMvcTest to load full context

Step-by-Step Solution

Solution:

Step 1: Understand @WebMvcTest scope
@WebMvcTest loads only web layer, so service beans are not loaded automatically.
Step 2: Use @MockBean to provide mock dependencies
Annotating OrderService with @MockBean in the test class creates and injects a mock into the controller.
Final Answer:
Use @MockBean on OrderService field in the test class to inject a mock -> Option C
Quick Check:
@MockBean mocks service dependencies in @WebMvcTest [OK]

Quick Trick: Use @MockBean to mock services in @WebMvcTest [OK]

Common Mistakes:

Trying to @Autowired real service in @WebMvcTest
Not mocking service causing NoSuchBeanDefinitionException
Switching to @SpringBootTest unnecessarily

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You want to test a controller OrderController that depends on a service OrderService. Using @WebMvcTest, how can you provide a mock OrderService to the controller during testing?

Step 1: Understand @WebMvcTest scope

Step 2: Use @MockBean to provide mock dependencies

Final Answer:

Quick Check:

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