list.set(0, anotherTrue);
    assertThat(list.get(0)).isSameInstanceAs(true);
    list.set(1, anotherFalse);
    assertThat(list.get(1)).isSameInstanceAs(false);
  }

  public void testCountTrue() {
    assertThat(Booleans.countTrue()).isEqualTo(0);
    assertThat(Booleans.countTrue(false)).isEqualTo(0);
    assertThat(Booleans.countTrue(true)).isEqualTo(1);