@Test
public void testGetNullKey() throws Exception {

  Row row =
      new Row(
          TABLE, ImmutableMap.of(ID_COLUMN, new Column(TABLE.getColumns().get(ID_COLUMN), null)));
  MysqlMutation mutation = new MysqlInsertMutation(MUTATION_METADATA, row);
  assertEquals("test:users:null", MysqlKeyProvider.INSTANCE.get(mutation));
}