1 files changed, 48 insertions, 0 deletions
diff --git a/internal/tui/flamegraph/frame_animator_test.go b/internal/tui/flamegraph/frame_animator_test.go
new file mode 100644
index 0000000..6b4d4f7
--- /dev/null
+++ b/internal/tui/flamegraph/frame_animator_test.go
@@ -0,0 +1,48 @@
+package flamegraph
+
+import "testing"
+
+func TestFrameCoordToTargetRowKeepsUniformBarMapping(t *testing.T) {
+	frames := []tuiFrame{
+		{Name: "root", Row: 0, Col: 0, Width: 20, Path: "root"},
+		{Name: "a", Row: 1, Col: 0, Width: 20, Path: "root" + pathSeparator + "a"},
+		{Name: "b", Row: 2, Col: 0, Width: 20, Path: "root" + pathSeparator + "a" + pathSeparator + "b"},
+		{Name: "leaf", Row: 3, Col: 0, Width: 20, Path: "root" + pathSeparator + "a" + pathSeparator + "b" + pathSeparator + "leaf"},
+	}
+	availableRows := 8
+	want := []int{3, 3, 2, 2, 1, 1, 0, 0}
+	for dataRow, expected := range want {
+		if got := frameCoordToTargetRow(frames, dataRow, availableRows, false); got != expected {
+			t.Fatalf("dataRow=%d: got row=%d want=%d", dataRow, got, expected)
+		}
+	}
+}
+
+func TestFrameCoordToTargetRowHeightMetricMapsExpandedLeafBand(t *testing.T) {
+	frames := []tuiFrame{
+		{Name: "root", Row: 0, Col: 0, Width: 20, Path: "root"},
+		{Name: "leaf", Row: 1, Col: 0, Width: 20, Path: "root" + pathSeparator + "leaf", HeightTotal: 100},
+	}
+	availableRows := 6
+	want := []int{1, 1, 1, 1, 1, 0}
+	for dataRow, expected := range want {
+		if got := frameCoordToTargetRow(frames, dataRow, availableRows, true); got != expected {
+			t.Fatalf("dataRow=%d: got row=%d want=%d", dataRow, got, expected)
+		}
+	}
+}
+
+func TestFrameIndexAtHeightMetricMapsClicksInExpandedLeafBand(t *testing.T) {
+	frames := []tuiFrame{
+		{Name: "root", Row: 0, Col: 0, Width: 20, Path: "root"},
+		{Name: "leaf", Row: 1, Col: 0, Width: 20, Path: "root" + pathSeparator + "leaf", HeightTotal: 100},
+	}
+	for y := 1; y <= 5; y++ {
+		if got := frameIndexAt(frames, 10, y, 20, 9, false, true); got != 1 {
+			t.Fatalf("y=%d: expected leaf frame index 1, got %d", y, got)
+		}
+	}
+	if got := frameIndexAt(frames, 10, 6, 20, 9, false, true); got != 0 {
+		t.Fatalf("y=6: expected root frame index 0, got %d", got)
+	}
+}