}

  public void testEqualsObject() {
    new EqualsTester()
        .addEqualityGroup(testTable, HashBasedTable.create(testTable))
        .addEqualityGroup(ImmutableTable.of(), HashBasedTable.create())
        .addEqualityGroup(HashBasedTable.create(ImmutableTable.of('A', 2, "")))
        .testEquals();
  }

  @GwtIncompatible // ArrayTable
  public void testEqualsObjectNullValues() {

    assertEquals(0, INSTANCE.hashCode());
  }

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

    new EqualsTester()
        .addEqualityGroup(INSTANCE, HashBasedTable.create(), TreeBasedTable.create())
        .addEqualityGroup(nonEmptyTable)
        .testEquals();
  }

  @GwtIncompatible // ArrayTable

    }
  }

  public void testPutAllTable() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    Table<String, Integer, @NonNull C> other = HashBasedTable.create();
    other.put("foo", 1, cellValue('d'));
    other.put("bar", 2, cellValue('e'));
    other.put("cat", 2, cellValue('f'));
    table.putAll(other);
    assertEquals((Character) 'd', table.get("foo", 1));

import com.google.common.base.Splitter;
import com.google.common.base.Ticker;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.BiMap;
import com.google.common.collect.HashBasedTable;
import com.google.common.collect.HashBiMap;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.HashMultiset;
import com.google.common.collect.ImmutableBiMap;

    }
  }

  public void testPutAllTable() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    Table<String, Integer, @NonNull C> other = HashBasedTable.create();
    other.put("foo", 1, cellValue('d'));
    other.put("bar", 2, cellValue('e'));
    other.put("cat", 2, cellValue('f'));
    table.putAll(other);
    assertEquals((Character) 'd', table.get("foo", 1));

  public void testEquals() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    // We know that we have only added non-null Characters.
    Table<String, Integer, Character> hashCopy =
        HashBasedTable.create((Table<String, Integer, ? extends Character>) table);
    Table<String, Integer, C> reordered = create("foo", 3, 'c', "foo", 1, 'a', "bar", 1, 'b');

  public void testEquals() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    // We know that we have only added non-null Characters.
    Table<String, Integer, Character> hashCopy =
        HashBasedTable.create((Table<String, Integer, ? extends Character>) table);
    Table<String, Integer, C> reordered = create("foo", 3, 'c', "foo", 1, 'a', "bar", 1, 'b');

 * support {@link Iterator#remove}. If the table is modified after an iterator is created, the
 * iterator remains valid.
 *
 * <p>This class requires less memory than the {@link HashBasedTable} and {@link TreeBasedTable}
 * implementations, except when the table is sparse.
 *
 * <p>Null row keys or column keys are not permitted.
 *