Function stubContentWindow

packages/player/src/hyperframes-player.test.ts:959–967

(stub: FakeContentWindow | "throw")

  // sync path sees. Passing `"throw"` simulates the cross-origin SecurityError
  // a real browser raises when reading `contentWindow.<anything>`.
  function stubContentWindow(stub: FakeContentWindow | "throw") {
    Object.defineProperty(player.iframe, "contentWindow", {
      configurable: true,
      get() {
        if (stub === "throw") throw new Error("SecurityError");
        return stub;
      },
    });
  }

  it("calls __player.seek directly on the same-origin path", () => {
    // The whole point of P3-1: when the runtime is reachable, scrubs land in