.isEqualTo(1);
    }
    assertThat(Doubles.indexOf(new double[] {5.0, NaN, NaN, 5.0}, new double[] {NaN, NaN}))
        .isEqualTo(-1);
  }

  public void testLastIndexOf() {
    assertThat(Doubles.lastIndexOf(EMPTY, (double) 1)).isEqualTo(-1);
    assertThat(Doubles.lastIndexOf(ARRAY1, (double) 2)).isEqualTo(-1);
    assertThat(Doubles.lastIndexOf(ARRAY234, (double) 1)).isEqualTo(-1);

          .isEqualTo(1);
    }
    assertThat(Floats.indexOf(new float[] {5f, NaN, NaN, 5f}, new float[] {NaN, NaN}))
        .isEqualTo(-1);
  }

  public void testLastIndexOf() {
    assertThat(Floats.lastIndexOf(EMPTY, (float) 1)).isEqualTo(-1);
    assertThat(Floats.lastIndexOf(ARRAY1, (float) 2)).isEqualTo(-1);
    assertThat(Floats.lastIndexOf(ARRAY234, (float) 1)).isEqualTo(-1);

    assertThat(
            Longs.indexOf(
                new long[] {(long) 4, (long) 3, (long) 2},
                new long[] {(long) 2, (long) 3, (long) 4}))
        .isEqualTo(-1);
  }

  public void testLastIndexOf() {
    assertThat(Longs.lastIndexOf(EMPTY, (long) 1)).isEqualTo(-1);
    assertThat(Longs.lastIndexOf(ARRAY1, (long) 2)).isEqualTo(-1);
    assertThat(Longs.lastIndexOf(ARRAY234, (long) 1)).isEqualTo(-1);