code: @SuppressWarnings("unchecked")
      <T> T staticMockMarker(Class<T> clazz) {
          return (T) classToMarker.get(clazz);
      }
docs: Get marker for a mocked/spies class or {@code null}.
  
  @param clazz The class that is mocked
  @return marker for a mocked class or {@code null} if class is not mocked in this session
  @see ExtendedMockito#staticMockMarker(Class)