test(doubleTap): cover constructor, verifier round-trip, and runner dispatch

internal/runner/runner_test.go

@@ -294,6 +294,47 @@ func TestApplyAction_V8InputTextAtOriginStillTaps(t *testing.T) {
 	}
 }
 
+func TestApplyAction_DoubleTapDispatchesTwoTapsAtCoordinates(t *testing.T) {
+	driverMock := mockdriver.New()
+	action := verifier.Action{Kind: verifier.ActionKindDoubleTap, X: 100, Y: 200}
+
+	start := time.Now()
+	if err := applyAction(context.Background(), driverMock, action, nil); err != nil {
+		t.Fatalf("apply action: %v", err)
+	}
+	elapsed := time.Since(start)
+	if elapsed < 40*time.Millisecond {
+		t.Errorf("expected >= 40ms gap between taps, elapsed %v", elapsed)
+	}
+	taps := 0
+	for _, a := range driverMock.Actions() {
+		if a.Kind == mockdriver.ActionTap && a.X == 100 && a.Y == 200 {
+			taps++
+		}
+	}
+	if taps != 2 {
+		t.Errorf("expected 2 Tap calls at (100,200), got %d in %v", taps, driverMock.Actions())
+	}
+}
+
+func TestApplyAction_DoubleTapDispatchesTwoSelectorTaps(t *testing.T) {
+	driverMock := mockdriver.New()
+	action := verifier.Action{Kind: verifier.ActionKindDoubleTap, On: "id:save"}
+
+	if err := applyAction(context.Background(), driverMock, action, nil); err != nil {
+		t.Fatalf("apply action: %v", err)
+	}
+	taps := 0
+	for _, a := range driverMock.Actions() {
+		if a.Kind == mockdriver.ActionTapSelector && a.Selector == "id:save" {
+			taps++
+		}
+	}
+	if taps != 2 {
+		t.Errorf("expected 2 TapSelector calls with id:save, got %d in %v", taps, driverMock.Actions())
+	}
+}
+
 func TestRunner_ParallelFetchCallsAllDriverMethods(t *testing.T) {
 	state := newHarness(t)
 	state.mock.MetricsData = driver.Metrics{CPUPercent: 5.0, HeapBytes: 1024, TotalMemoryBytes: 4096}

internal/verifier/verifier_test.go

@@ -282,6 +282,27 @@ func TestNextAction_NoSetupRegistered(t *testing.T) {
 	}
 }
 
+func TestDoubleTap_RoundTrip(t *testing.T) {
+	verifier := newVerifier(t)
+	mustLoad(t, verifier, `
+		globalThis.actions = __sanderling__.actions(() => [
+			__sanderling__.doubleTap({ on: "id:save" }),
+		]);
+	`)
+	_ = verifier.PushSnapshot(SnapshotInput{Snapshots: Snapshots{}})
+
+	action, err := verifier.NextAction()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if action.Kind != ActionKindDoubleTap {
+		t.Errorf("kind: got %v, want DoubleTap", action.Kind)
+	}
+	if action.On != "id:save" {
+		t.Errorf("selector: got %q, want id:save", action.On)
+	}
+}
+
 func TestInputText_RoundTrip(t *testing.T) {
 	verifier := newVerifier(t)
 	mustLoad(t, verifier, `