### Question:
DistrictTeamExtractor implements Func1<List<DistrictRanking>, DistrictRanking> { public DistrictTeamExtractor(String teamKey) { mTeamKey = teamKey; } DistrictTeamExtractor(String teamKey); @Override DistrictRanking call(List<DistrictRanking> districtTeams);  }### Answer:
@Test public void testDistrictTeamExtractor() { DistrictRanking extracted = mExtractor.call(mDistrictTeams); assertNotNull(extracted); assertEquals(extracted.getTeamKey(), mSearchTeamKey); }