How to Mock a Single Static Method Returning an Object Using PowerMockito?

Mocking Single Static Method to Return an Object Using PowerMockito

When dealing with a class containing multiple static methods, the challenge arises in mocking a single static method while ensuring it returns an object. Here's a detailed solution using PowerMockito:

1. Enable Static Mocking:

   Start by enabling static mocking for the class you want to modify using PowerMockito.mockStatic(Class.class). This allows you to set up specific behaviors for static methods within that class.

2. Stubbing the Method:

   To specify the behavior of the target static method, use the when-thenReturn syntax. For example:

   when(Class.m1(param1, param2)).thenReturn(objectToReturn);

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   This specifies that when m1 is called with the given parameters, it should return the provided object.

3. Avoiding Default Return Values:

   By default, PowerMockito provides its own default values for unstubbed static methods. To override this and return a custom object, it's crucial to use the 1-argument version of mockStatic without specifying a default strategy.

4. Example Implementation:

   Consider the following code snippet:

   PowerMockito.mockStatic(Static.class);
   when(Static.m1("param1", "param2")).thenReturn(new Object());

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   This code mocks the static method m1 in the Static class and stubs it to return a new instance of an object.

5. Using the Mocked Method:

   Once the static method is mocked and stubbed, you can use it as usual. The method call will be intercepted by PowerMockito and return the specified object.

Remember, the key difference here is using the 1-argument version of mockStatic to enable static mocking without specifying a default strategy, and then using the when-thenReturn syntax to stub a single static method to return an object.

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