@Test
public void testGetDurationUs_forUnnnownInputLength_returnUnknownDuration() {

  constantBitrateSeekMap =
      new ConstantBitrateSeekMap(
          /* inputLength= */ C.LENGTH_UNSET,
          /* firstFrameBytePosition= */ 100,
          /* bitrate= */ 8_000,
          /* frameSize= */ 100);
  assertThat(constantBitrateSeekMap.getDurationUs()).isEqualTo(C.TIME_UNSET);
}