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src/editor/canvas/viewportAspectFrame.test.ts

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+import { describe, expect, it } from "vitest";
+import { fitFrameWithinViewport } from "./viewportAspectFrame";
+
+describe("fitFrameWithinViewport", () => {
+  it("keeps framed aspect layouts inside the visible safe area between overlay side panels", () => {
+    const frame = fitFrameWithinViewport(1000, 700, 16 / 9, 126, {
+      left: 220,
+      right: 300,
+      top: 0,
+      bottom: 0,
+    });
+
+    expect(frame.left).toBeGreaterThanOrEqual(260);
+    expect(frame.left + frame.width).toBeLessThanOrEqual(660);
+    expect(frame.top).toBeGreaterThanOrEqual(40);
+    expect(frame.top + frame.height).toBeLessThanOrEqual(574);
+  });
+});