[Solved] Given this test snippet:@MockBean private PaymentService paymentService; @Test void testProcess() { when(paymentService.pay()).thenReturn(true);... }What will be printed when the test runs? | Spring Boot

Spring Boot - Testing Spring Boot Applications

Given this test snippet:

@MockBean
private PaymentService paymentService;

@Test
void testProcess() {
  when(paymentService.pay()).thenReturn(true);
  boolean result = paymentService.pay();
  System.out.println(result);
}

What will be printed when the test runs?

Anull

Bfalse

Ctrue

DException thrown

Step-by-Step Solution

Solution:

Step 1: Understand mocking behavior
The mock paymentService is told to return true when pay() is called using when().thenReturn(true).
Step 2: Trace the method call
Calling paymentService.pay() returns true as configured, so result is true and printed.
Final Answer:
true -> Option C
Quick Check:
Mock returns configured value = true [OK]

Quick Trick: Mock returns what you tell it with when().thenReturn() [OK]

Common Mistakes:

Expecting default false instead of configured true
Confusing mock with real implementation output
Not setting up when().thenReturn() before call

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Given this test snippet:

Step 1: Understand mocking behavior

Step 2: Trace the method call

Final Answer:

Quick Check:

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