@Test
public void testGetResponseDescriptorDTOAndRemoveShouldReturnNullWhenKeyNotFound() {

    //GIVEN
    Map<String, ResponseDescriptor> responseDescriptorMap = new HashMap<>();
    String key = "key";
    Whitebox.setInternalState(underTest, "responseDescriptorMap", responseDescriptorMap);
    //WHEN
    ResponseDescriptorDTO actual = underTest.getResponseDescriptorDTOAndRemove(key);
    //THEN
    assertNull(actual);
}