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Merge pull request #2744 from cdr/add-tests-serviceWorker
feat(testing): add tests for serviceWorker.ts
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Original file line number | Diff line number | Diff line change |
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interface MockEvent { | ||
claim: jest.Mock<any, any> | ||
waitUntil?: jest.Mock<any, any> | ||
} | ||
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interface Listener { | ||
event: string | ||
cb: (event?: MockEvent) => void | ||
} | ||
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describe("serviceWorker", () => { | ||
let listeners: Listener[] = [] | ||
let spy: jest.SpyInstance | ||
let claimSpy: jest.Mock<any, any> | ||
let waitUntilSpy: jest.Mock<any, any> | ||
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function emit(event: string) { | ||
listeners | ||
.filter((listener) => listener.event === event) | ||
.forEach((listener) => { | ||
switch (event) { | ||
case "activate": | ||
listener.cb({ | ||
claim: jest.fn(), | ||
waitUntil: jest.fn(() => waitUntilSpy()), | ||
}) | ||
break | ||
default: | ||
listener.cb() | ||
} | ||
}) | ||
} | ||
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beforeEach(() => { | ||
claimSpy = jest.fn() | ||
spy = jest.spyOn(console, "log") | ||
waitUntilSpy = jest.fn() | ||
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Object.assign(global, { | ||
self: global, | ||
addEventListener: (event: string, cb: () => void) => { | ||
listeners.push({ event, cb }) | ||
}, | ||
clients: { | ||
claim: claimSpy.mockResolvedValue("claimed"), | ||
}, | ||
}) | ||
}) | ||
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afterEach(() => { | ||
jest.restoreAllMocks() | ||
jest.resetModules() | ||
spy.mockClear() | ||
claimSpy.mockClear() | ||
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// Clear all the listeners | ||
listeners = [] | ||
}) | ||
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it("should add 3 listeners: install, activate and fetch", () => { | ||
require("../src/browser/serviceWorker.ts") | ||
const listenerEventNames = listeners.map((listener) => listener.event) | ||
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expect(listeners).toHaveLength(3) | ||
expect(listenerEventNames).toContain("install") | ||
expect(listenerEventNames).toContain("activate") | ||
expect(listenerEventNames).toContain("fetch") | ||
}) | ||
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it("should call the proper callbacks for 'install'", async () => { | ||
require("../src/browser/serviceWorker.ts") | ||
emit("install") | ||
expect(spy).toHaveBeenCalledWith("[Service Worker] installed") | ||
expect(spy).toHaveBeenCalledTimes(1) | ||
}) | ||
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it("should do nothing when 'fetch' is called", async () => { | ||
require("../src/browser/serviceWorker.ts") | ||
emit("fetch") | ||
expect(spy).not.toHaveBeenCalled() | ||
}) | ||
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it("should call the proper callbacks for 'activate'", async () => { | ||
require("../src/browser/serviceWorker.ts") | ||
emit("activate") | ||
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// Activate serviceWorker | ||
expect(spy).toHaveBeenCalledWith("[Service Worker] activated") | ||
expect(waitUntilSpy).toHaveBeenCalled() | ||
expect(claimSpy).toHaveBeenCalled() | ||
}) | ||
}) |