// -------------------------------------------------------------------------
  public void test_getSingleExchange_ExternalIdBundle_found() throws Exception {
    ExchangeMaster mock = mock(ExchangeMaster.class);
    ExchangeSearchRequest request = new ExchangeSearchRequest(BUNDLE);
    request.setPagingRequest(PagingRequest.ONE);
    request.setVersionCorrection(VC);

    ExchangeSearchResult result = new ExchangeSearchResult();
    result.getDocuments().add(new ExchangeDocument(example()));

    when(mock.search(request)).thenReturn(result);
    MasterExchangeSource test = new MasterExchangeSource(mock, VC);
    Exchange testResult = test.getSingle(BUNDLE);
    verify(mock, times(1)).search(request);

    assertEquals(example(), testResult);
  }
  public void test_getSingleExchange_ExternalId_notFound() throws Exception {
    ExchangeMaster mock = mock(ExchangeMaster.class);
    ExchangeSearchRequest request = new ExchangeSearchRequest(ID);
    request.setPagingRequest(PagingRequest.ONE);
    request.setPagingRequest(PagingRequest.ONE);
    request.setVersionCorrection(VC);

    ExchangeSearchResult result = new ExchangeSearchResult();

    when(mock.search(request)).thenReturn(result);
    MasterExchangeSource test = new MasterExchangeSource(mock, VC);
    Exchange testResult = test.getSingle(ID);
    verify(mock, times(1)).search(request);

    assertEquals(null, testResult);
  }