protected HoodieDefaultTimeline filterInstantsTimeline(HoodieDefaultTimeline timeline) {
    return HoodieInputFormatUtils.filterInstantsTimeline(timeline);
  }
@Test
  public void testPendingCompactionWithActiveCommits() throws IOException {
    // setup 4 sample instants in timeline
    List<HoodieInstant> instants = new ArrayList<>();
    HoodieInstant t1 = new HoodieInstant(HoodieInstant.State.COMPLETED, HoodieTimeline.COMMIT_ACTION, "1");
    HoodieInstant t2 = new HoodieInstant(HoodieInstant.State.INFLIGHT, HoodieTimeline.DELTA_COMMIT_ACTION, "2");
    HoodieInstant t3 = new HoodieInstant(HoodieInstant.State.REQUESTED, HoodieTimeline.COMPACTION_ACTION, "3");
    HoodieInstant t4 = new HoodieInstant(HoodieInstant.State.COMPLETED, HoodieTimeline.DELTA_COMMIT_ACTION, "4");
    HoodieInstant t5 = new HoodieInstant(HoodieInstant.State.REQUESTED, HoodieTimeline.COMPACTION_ACTION, "5");
    HoodieInstant t6 = new HoodieInstant(HoodieInstant.State.COMPLETED, HoodieTimeline.DELTA_COMMIT_ACTION, "6");

    instants.add(t1);
    instants.add(t2);
    instants.add(t3);
    instants.add(t4);
    instants.add(t5);
    instants.add(t6);
    HoodieTableMetaClient metaClient = HoodieTestUtils.init(basePath.toString(), HoodieFileFormat.HFILE);
    HoodieActiveTimeline timeline = new HoodieActiveTimeline(metaClient);
    timeline.setInstants(instants);

    // Verify getCommitsTimelineBeforePendingCompaction does not return instants after first compaction instant
    HoodieTimeline filteredTimeline = inputFormat.filterInstantsTimeline(timeline);
    assertTrue(filteredTimeline.containsInstant(t1));
    assertTrue(filteredTimeline.containsInstant(t2));
    assertFalse(filteredTimeline.containsInstant(t3));
    assertFalse(filteredTimeline.containsInstant(t4));
    assertFalse(filteredTimeline.containsInstant(t5));
    assertFalse(filteredTimeline.containsInstant(t6));


    // remove compaction instant and setup timeline again
    instants.remove(t3);
    timeline = new HoodieActiveTimeline(metaClient);
    timeline.setInstants(instants);
    filteredTimeline = inputFormat.filterInstantsTimeline(timeline);

    // verify all remaining instants are returned.
    assertTrue(filteredTimeline.containsInstant(t1));
    assertTrue(filteredTimeline.containsInstant(t2));
    assertFalse(filteredTimeline.containsInstant(t3));
    assertTrue(filteredTimeline.containsInstant(t4));
    assertFalse(filteredTimeline.containsInstant(t5));
    assertFalse(filteredTimeline.containsInstant(t6));

    // remove remaining compaction instant and setup timeline again
    instants.remove(t5);
    timeline = new HoodieActiveTimeline(metaClient);
    timeline.setInstants(instants);
    filteredTimeline = inputFormat.filterInstantsTimeline(timeline);

    // verify all remaining instants are returned.
    assertTrue(filteredTimeline.containsInstant(t1));
    assertTrue(filteredTimeline.containsInstant(t2));
    assertFalse(filteredTimeline.containsInstant(t3));
    assertTrue(filteredTimeline.containsInstant(t4));
    assertFalse(filteredTimeline.containsInstant(t5));
    assertTrue(filteredTimeline.containsInstant(t6));
  }