PagedIterator<GHPullRequestCommitDetail> itr = Mockito.mock(PagedIterator.class);
PagedIterable pagedItr = Mockito.mock(PagedIterable.class);
Commit commit = mock(Commit.class);
GHPullRequestCommitDetail commitDetail = mock(GHPullRequestCommitDetail.class);
given(pr.listCommits()).willReturn(pagedItr);
given(pagedItr.iterator()).willReturn(itr);
given(itr.hasNext()).willReturn(true, false);
given(itr.next()).willReturn(commitDetail);
given(commitDetail.getCommit()).willReturn(commit);
given(commit.getCommitter()).willReturn(committer);
given(cause.getCommentBody()).willReturn(comment);
}