Consider a test with two @MockBean declarations for the same bean type InventoryService. What happens when the test runs?

hard📝 Conceptual Q9 of 15

Spring Boot - Testing Spring Boot Applications

Consider a test with two @MockBean declarations for the same bean type InventoryService. What happens when the test runs?

ABoth mocks are injected into different places automatically

BThe last declared @MockBean replaces the previous one in the context

CSpring throws a bean definition conflict error at startup

DThe test runs but only the first mock is used

Step-by-Step Solution

Solution:

Step 1: Understand @MockBean behavior with duplicates
When multiple @MockBean of the same type exist, the last one overrides the previous in the context.
Step 2: Confirm Spring behavior
Spring does not throw an error but uses the last declared mock for injection.
Final Answer:
The last declared @MockBean replaces the previous one in the context -> Option B
Quick Check:
Last @MockBean wins for same bean type [OK]

Quick Trick: Only the last @MockBean of a type is active in the context [OK]

Common Mistakes:

Master "Testing Spring Boot Applications" in Spring Boot

9 interactive learning modes - each teaches the same concept differently

Want More Practice?

15+ quiz questions · All difficulty levels · Free

More Spring Boot Quizzes