// -------------------------------------------------------------------------
  public void test_getExchange_ObjectId_found() throws Exception {
    ExchangeMaster mock = mock(ExchangeMaster.class);

    ExchangeDocument doc = new ExchangeDocument(example());
    when(mock.get(OID, VC)).thenReturn(doc);
    MasterExchangeSource test = new MasterExchangeSource(mock, VC);
    Exchange testResult = test.get(OID, VC);
    verify(mock, times(1)).get(OID, VC);

    assertEquals(example(), testResult);
  }
  @Test(expectedExceptions = DataNotFoundException.class)
  public void test_getExchange_UniqueId_notFound() throws Exception {
    ExchangeMaster mock = mock(ExchangeMaster.class);

    when(mock.get(OID, VC)).thenThrow(new DataNotFoundException(""));
    MasterExchangeSource test = new MasterExchangeSource(mock, VC);
    try {
      test.get(UID);
    } finally {
      verify(mock, times(1)).get(OID, VC);
    }
  }