public void contains(@Nullable Object rowKey, @Nullable Object columnKey) {
    if (!checkNotNull(actual).contains(rowKey, columnKey)) {
      /*
       * TODO(cpovirk): Consider including information about whether any cell with the given row
       * *or* column was present.
       */
      failWithActual(
          simpleFact("expected to contain mapping for row-column key pair"),
          fact("row key", rowKey),
          fact("column key", columnKey));
    }
  }
@Test
  public void contains() {
    ImmutableTable<String, String, String> table = ImmutableTable.of("row", "col", "val");
    assertThat(table).contains("row", "col");
  }