@Test
  public void testNullInput() throws Exception {
    Map<StoreKey, StoreKey> storeKeyMap = storeKeyConverter.convert(null);
    assertEquals("storeKeyMap should not have inputs", storeKeyMap.size(), 0);
  }
Tests conversion of a null input
@throws Exception
ambry-commons/src/test/java/com/github/ambry/store/StoreKeyConverterImplNoOpTest.java