Mocking a Method in the Same Test Class Using Mockito Spy

Date: 2025-02-10

This article demonstrates using Mockito's spy() method for partial mocking within a unit test. When testing a class with interdependent methods (e.g., calculateSquareSum() calling add()), spy() allows mocking a specific method (add()) without affecting others. A spy object is created using Mockito.spy(), and the method to be mocked is stubbed using when(...).thenReturn(...). This enables isolated testing of individual methods, ensuring accurate and reliable unit tests. The example uses JUnit 5 and demonstrates verifying the expected outcome after mocking.

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