@Test public void testCountingDistinct_distinctEntries() {

  assertThat(BiStream.of(1, "one", 2, "two").collect(BiCollectors.countingDistinct()))
      .isEqualTo(2);
  assertThat(BiStream.of(1, "one", 1, "uno").collect(BiCollectors.countingDistinct()))
      .isEqualTo(2);
  assertThat(BiStream.of(1, "one", 2, "one").collect(BiCollectors.countingDistinct()))
      .isEqualTo(2);
}