@Test
public void shouldReturnAnInstanceOfCollectionMergingDefaultProcessorForHeader() throws Exception {

    CollectionMergingParamProcessor expected = mock(CollectionMergingParamProcessor.class);
    whenNew(CollectionMergingParamProcessor.class).withArguments("-").thenReturn(expected);
    ParamProcessor actual = ParamProcessors.newInstance(ParamType.HEADER, "-");
    assertSame(expected, actual);
}