assertEquals(ImmutableSet.of('a'), testTable.rowKeySet());
  }

  public void testRowMap() {
    assertEquals(ImmutableMap.of('a', ImmutableMap.of(1, "blah")), testTable.rowMap());
  }

  public void testEqualsObject() {
    new EqualsTester()
        .addEqualityGroup(testTable, HashBasedTable.create(testTable))
        .addEqualityGroup(ImmutableTable.of(), HashBasedTable.create())

    return ImmutableSet.of(INSTANCE);
  }

  public void testHashCode() {
    assertEquals(0, INSTANCE.hashCode());
  }

  public void testEqualsObject() {
    Table<Character, Integer, String> nonEmptyTable = HashBasedTable.create();
    nonEmptyTable.put('A', 1, "blah");

    new EqualsTester()