[Solved] Consider this test code snippet:@MockBean private OrderService orderService; @Test void testOrder() { orderService.placeOrder(); verify(orderService).placeOrder();... What is the most likely cause? | Spring Boot

Spring Boot - Testing Spring Boot Applications

Consider this test code snippet:

@MockBean
private OrderService orderService;

@Test
void testOrder() {
  orderService.placeOrder();
  verify(orderService).placeOrder();
}

When running this test, it fails with a NullPointerException. What is the most likely cause?

AThe <code>orderService</code> is not mocked properly because it is private

BThe <code>verify</code> method is called before <code>placeOrder()</code>

CThe <code>placeOrder()</code> method is final and cannot be mocked

DThe <code>@MockBean</code> annotation was not processed because the test class lacks <code>@SpringBootTest</code>

Step-by-Step Solution

Solution:

Step 1: Check test setup requirements
@MockBean requires Spring Boot test context to process annotations, usually via @SpringBootTest or similar.
Step 2: Identify cause of NullPointerException
If @MockBean is not processed, orderService remains null, causing NPE when calling placeOrder().
Final Answer:
The @MockBean annotation was not processed because the test class lacks @SpringBootTest -> Option D
Quick Check:
@MockBean needs Spring context [OK]

Quick Trick: Always use @SpringBootTest to enable @MockBean processing [OK]

Common Mistakes:

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