powermock mocking constructor via whennew() does not work with anonymous class

Question

I have a DummyResource class and a DummyTarget file, and a test class TestDummyResource as below, but the mocked object DummyResource dr = mock(DummyResource.class)

Answer 1

Actually, you have to prepare for test the class that makes the constructor call, not the class on which the constructor was called. See https://github.com/jayway/powermock/wiki/MockConstructor.

In your case, you should use @PrepareForTest(DummyTarget.class)

Answer 2

It looks like an anonymous class may inherit the package of the class that defines it. Can you try the wildcard form of PrepareForTest?:

@PrepareForTest("com.smin.dummy.*")

If that doesn't work, you could try the shotgun PrepareEverythingForTest Annotation.

Answer 3

I had the same problem, and resolved it with using whenNew with fully qualified name. The fully qualified name of an inner anonymous class in your case is:

DummyTarget.class + "$1"

so you should create a mock of that class:

DummyResource dr = mock(Class.forName(DummyTarget.class + "$1"));

and it will work for you.

Also, don't forget to prepare the DummyTarget class:

@PrepareForTest(DummyTarget.class)

Hope it helped =]

Answer 4

You need to have prepared the class calling the constructor, not the class on which the constructor is called, the following should fix you up:

@PrepareForTest(DummyTarget.class)

For more information check this page.