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| 1 | +// @vitest-environment jsdom |
| 2 | +import { afterEach, beforeEach, describe, expect, it, vi } from "vitest"; |
| 3 | +import { staleAssetRecoveryScript } from "./StaleAssetRecovery"; |
| 4 | + |
| 5 | +// Each staleAssetRecoveryScript() call models a fresh page load: it reads the shared |
| 6 | +// sessionStorage budget and returns its own `recover`. We drive recover() directly rather |
| 7 | +// than dispatching resource-error events, so accumulated window listeners never fire. |
| 8 | +describe("staleAssetRecoveryScript", () => { |
| 9 | + let reload: ReturnType<typeof vi.fn>; |
| 10 | + |
| 11 | + beforeEach(() => { |
| 12 | + sessionStorage.clear(); |
| 13 | + reload = vi.fn(); |
| 14 | + vi.stubGlobal("location", { reload }); |
| 15 | + vi.stubGlobal("navigator", { onLine: true }); |
| 16 | + }); |
| 17 | + |
| 18 | + afterEach(() => { |
| 19 | + vi.unstubAllGlobals(); |
| 20 | + vi.restoreAllMocks(); |
| 21 | + }); |
| 22 | + |
| 23 | + it("reloads on a recovery", () => { |
| 24 | + staleAssetRecoveryScript().recover(); |
| 25 | + expect(reload).toHaveBeenCalledTimes(1); |
| 26 | + }); |
| 27 | + |
| 28 | + it("reloads only once per page even if several assets fail (re-entrancy guard)", () => { |
| 29 | + const { recover } = staleAssetRecoveryScript(); |
| 30 | + recover(); |
| 31 | + recover(); |
| 32 | + recover(); |
| 33 | + expect(reload).toHaveBeenCalledTimes(1); |
| 34 | + }); |
| 35 | + |
| 36 | + it("stops reloading once the budget is spent across reloads", () => { |
| 37 | + staleAssetRecoveryScript().recover(); // reload 1 |
| 38 | + staleAssetRecoveryScript().recover(); // reload 2 |
| 39 | + staleAssetRecoveryScript().recover(); // budget spent -> no reload |
| 40 | + expect(reload).toHaveBeenCalledTimes(2); |
| 41 | + }); |
| 42 | + |
| 43 | + it("does not reload when offline", () => { |
| 44 | + vi.stubGlobal("navigator", { onLine: false }); |
| 45 | + staleAssetRecoveryScript().recover(); |
| 46 | + expect(reload).not.toHaveBeenCalled(); |
| 47 | + }); |
| 48 | + |
| 49 | + it("does not reload when sessionStorage is unavailable", () => { |
| 50 | + vi.spyOn(Storage.prototype, "setItem").mockImplementation(() => { |
| 51 | + throw new Error("blocked"); |
| 52 | + }); |
| 53 | + staleAssetRecoveryScript().recover(); |
| 54 | + expect(reload).not.toHaveBeenCalled(); |
| 55 | + }); |
| 56 | +}); |
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