@Test
public void success() throws Exception {

  future1.complete(config.withOffsets(ImmutableMap.of(0, range)));
  future2.complete(config.withOffsets(ImmutableMap.of(1, range)));
  future3.complete(config.withOffsets(ImmutableMap.of(2, range)));
  LanderConfiguration result = underTest.run().join();
  assertThat(result, is(config));
}