@Test
public void appendTypeArgs_delegates_to_CommonMethods() throws Exception {

  FileContextTestImpl fileContext = new FileContextTestImpl();
  List<DAType> daTypes = ImmutableList.of(DATypeFactory.from(String.class));
  methodWriterWithMock(fileContext).appendTypeArgs(daTypes);
  verify(commonMethods).appendTypeArgs(daTypes);
  verifyNoInteraction(fileContext);
}