### Question:
CSVLatencyReader { public List<String> cities() { return new ArrayList<>(latencyMatrix.keySet()); } CSVLatencyReader();  CSVLatencyReader(Map<String, Map<String, Float>> latencyMatrix); Map<String, Map<String, Float>> getLatencyMatrix(); List<String> cities(); static void main(String[] args);  }### Answer:
@Test public void testLoad() { reader = new CSVLatencyReader(); Assert.assertTrue(reader.cities().size() > 0); }
@Test public void testSupportedCities() { Assert.assertTrue(reader.cities().contains(city1)); Assert.assertTrue(reader.cities().contains(city2)); Assert.assertTrue(reader.cities().contains(city3)); Assert.assertFalse(reader.cities().contains(city4)); }