private void mockReposFor(GHPerson person, List<String> repositoryNames) throws IOException {
   List<GHRepository> repositories = repositoryListOf(repositoryNames);
   PagedIterable<GHRepository> pagedRepositories = PowerMockito.mock(PagedIterable.class);
   PowerMockito.when(person.listRepositories()).thenReturn(pagedRepositories);
   PowerMockito.when(pagedRepositories.asList()).thenReturn(repositories);
 };