Using PowerMockito.whenNew() is not getting mocked and original method is called

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You need to put the class where the constructor is called into the @PrepareForTest annotation instead of the class which is being constructed – see Mock construction of new objects.

In your case:

✗ @PrepareForTest(MyQueryClass.class)

✓ @PrepareForTest(A.class)

More general:

✗ @PrepareForTest(NewInstanceClass.class)

✓ @PrepareForTest(ClassThatCreatesTheNewInstance.class)

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