func TestConfirmLabelDontKnow(t *testing.T) {
	df := &utils.DataFile{
		Meta: &utils.DataMeta{},
		Segments: []*utils.Segment{
			{
				StartTime: 10.0,
				EndTime:   20.0,
				Labels: []*utils.Label{
					{Species: "Don't Know", Certainty: 0, Filter: "test-filter"},
				},
			},
		},
	}
	state := NewClassifyState(ClassifyConfig{
		Filter:    "test-filter",
		Reviewer:  "David",
		Certainty: -1,
	}, []*utils.DataFile{df})
	// ConfirmLabel on Don't Know should be a no-op
	if state.ConfirmLabel() {
		t.Error("ConfirmLabel() should return false for Don't Know (certainty=0)")
	}
	label := df.Segments[0].Labels[0]
	if label.Species != "Don't Know" {
		t.Errorf("Species should remain Don't Know, got %s", label.Species)
	}
	if label.Certainty != 0 {
		t.Errorf("Certainty should remain 0, got %d", label.Certainty)
	}
	if state.Dirty {
		t.Error("State should not be dirty after confirming Don't Know")
	}
}

// Returns false for Don't Know (certainty=0) — confirming a Don't Know is a no-op;
// the caller should just advance to the next segment.

	if filterLabels[0].Certainty == 0 {
		return false
	}