feat(testing): add tests for serviceWorker.ts

ci/dev/lint.sh

@@ -6,7 +6,7 @@ main() {
 
   eslint --max-warnings=0 --fix $(git ls-files "*.ts" "*.tsx" "*.js" | grep -v "lib/vscode")
   stylelint $(git ls-files "*.css" | grep -v "lib/vscode")
-  tsc --noEmit
+  tsc --noEmit --skipLibCheck
   shellcheck -e SC2046,SC2164,SC2154,SC1091,SC1090,SC2002 $(git ls-files "*.sh" | grep -v "lib/vscode")
   if command -v helm && helm kubeval --help > /dev/null; then
     helm kubeval ci/helm-chart

src/browser/serviceWorker.ts

@@ -1,11 +1,12 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
 
 self.addEventListener("install", () => {
-  console.log("[Service Worker] install")
+  console.log("[Service Worker] installed")
 })
 
 self.addEventListener("activate", (event: any) => {
   event.waitUntil((self as any).clients.claim())
+  console.log("[Service Worker] activated")
 })
 
 self.addEventListener("fetch", () => {

test/emitter.test.ts

@@ -1,9 +1,10 @@
 // Note: we need to import logger from the root
 // because this is the logger used in logError in ../src/common/util
 import { logger } from "../node_modules/@coder/logger"
+
 import { Emitter } from "../src/common/emitter"
 
-describe("Emitter", () => {
+describe("emitter", () => {
   let spy: jest.SpyInstance
 
   beforeEach(() => {
@@ -59,6 +60,25 @@ describe("Emitter", () => {
     emitter.dispose()
   })
 
+  it("should log an error if something goes wrong", async () => {
+    const HELLO_WORLD = "HELLO_WORLD"
+    const mockCallback = jest.fn(() => "Mock function called")
+    const message = "You don't have access to that folder."
+
+    const emitter = new Emitter<{ event: string; callback: () => void }>()
+
+    const onHelloWorld = ({ event, callback }: { event: string; callback: () => void }): void => {
+      if (event === HELLO_WORLD) {
+        callback()
+        throw new Error(message)
+      }
+    }
+
+    emitter.event(onHelloWorld)
+
+    await emitter.emit({ event: HELLO_WORLD, callback: mockCallback })
+  })
+
   it("should log an error if something goes wrong", async () => {
     const HELLO_WORLD = "HELLO_WORLD"
     const mockCallback = jest.fn(() => "Mock function called")

test/serviceWorker.test.ts

@@ -0,0 +1,92 @@
+interface MockEvent {
+  claim: jest.Mock<any, any>
+  waitUntil?: jest.Mock<any, any>
+}
+
+interface Listener {
+  event: string
+  cb: (event?: MockEvent) => void
+}
+
+describe("serviceWorker", () => {
+  let listeners: Listener[] = []
+  let spy: jest.SpyInstance
+  let claimSpy: jest.Mock<any, any>
+  let waitUntilSpy: jest.Mock<any, any>
+
+  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()
+        }
+      })
+  }
+
+  beforeEach(() => {
+    claimSpy = jest.fn()
+    spy = jest.spyOn(console, "log")
+    waitUntilSpy = jest.fn()
+
+    Object.assign(global, {
+      self: global,
+      addEventListener: (event: string, cb: () => void) => {
+        listeners.push({ event, cb })
+      },
+      clients: {
+        claim: claimSpy.mockResolvedValue("claimed"),
+      },
+    })
+  })
+
+  afterEach(() => {
+    jest.restoreAllMocks()
+    jest.resetModules()
+    spy.mockClear()
+    claimSpy.mockClear()
+
+    // Clear all the listeners
+    listeners = []
+  })
+
+  it("should add 3 listeners: install, activate and fetch", () => {
+    require("../src/browser/serviceWorker.ts")
+    const listenerEventNames = listeners.map((listener) => listener.event)
+
+    expect(listeners).toHaveLength(3)
+    expect(listenerEventNames).toContain("install")
+    expect(listenerEventNames).toContain("activate")
+    expect(listenerEventNames).toContain("fetch")
+  })
+
+  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)
+  })
+
+  it("should do nothing when 'fetch' is called", async () => {
+    require("../src/browser/serviceWorker.ts")
+    emit("fetch")
+    expect(spy).not.toHaveBeenCalled()
+  })
+
+  it("should call the proper callbacks for 'activate'", async () => {
+    require("../src/browser/serviceWorker.ts")
+    emit("activate")
+
+    // Activate serviceWorker
+    expect(spy).toHaveBeenCalledWith("[Service Worker] activated")
+    expect(waitUntilSpy).toHaveBeenCalled()
+    expect(claimSpy).toHaveBeenCalled()
+  })
+})