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To make a Mockito mock method return null, you simply need to use the thenReturn method and pass in a null value. Here's an example:

SomeObject mockObject = Mockito.mock(SomeObject.class);
Mockito.when(mockObject.someMethod()).thenReturn(null);

In this example, we create a Mockito mock object of type SomeObject. Then we use the when method to specify that when the someMethod method is called on this object, it should return null.

Note that you can also use the thenAnswer method to define more complex behavior, such as returning null only under certain conditions.