feat: test failure to register service worker

src/browser/register.ts

@@ -17,8 +17,7 @@ export async function registerServiceWorker(navigator: Navigator, path: string,
 }
 
 if (typeof navigator !== "undefined" && "serviceWorker" in navigator) {
-    const options = getOptions()
-    const path = normalize(`${options.csStaticBase}/dist/serviceWorker.js`)
-    registerServiceWorker(navigator, path, options)
-  }
+  const options = getOptions()
+  const path = normalize(`${options.csStaticBase}/dist/serviceWorker.js`)
+  registerServiceWorker(navigator, path, options)
 }

test/register.test.ts

@@ -1,4 +1,7 @@
 import { JSDOM } from "jsdom"
+// 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 { registerServiceWorker } from "../src/browser/register"
 const { window } = new JSDOM()
 global.window = (window as unknown) as Window & typeof globalThis
@@ -6,38 +9,63 @@ global.document = window.document
 global.navigator = window.navigator
 
 describe("register", () => {
-  const spy = jest.fn()
-  beforeAll(() => {
-    // register relies on navigator to be defined globally
-    // this is because the code is called on the browser
-    // so we're sure it will be defined
-    // We have to cast/assert so that TS thinks it's the correct type
-    Object.defineProperty(global.navigator, "serviceWorker", {
-      value: {
-        register: spy,
-      },
+  describe("registerServiceWorker", () => {
+    const spy = jest.fn()
+    let loggerSpy: jest.SpyInstance
+
+    beforeAll(() => {
+      Object.defineProperty(global.navigator, "serviceWorker", {
+        value: {
+          register: () => {
+            return "hello"
+          },
+        },
+      })
     })
-    // global.navigator.serviceWorker.register = (spy as unknown) as ServiceWorkerContainer["register"]
-  })
 
-  afterEach(() => {
-    jest.resetAllMocks()
-  })
+    beforeEach(() => {
+      loggerSpy = jest.spyOn(logger, "error")
+    })
 
-  afterAll(() => {
-    jest.restoreAllMocks()
-  })
-  it("should register a ServiceWorker", () => {
-    // call registerServiceWorker
-    const path = "/hello"
-    const mockOptions = {
-      base: "",
-      csStaticBase: "",
-      logLevel: 0,
-    }
-    registerServiceWorker(navigator, path, mockOptions)
-    // expect spy to have been called
-    expect(spy).toHaveBeenCalled()
-    expect(spy).toHaveBeenCalledTimes(1)
+    afterEach(() => {
+      jest.resetAllMocks()
+    })
+
+    afterAll(() => {
+      jest.restoreAllMocks()
+    })
+
+    it("should register a ServiceWorker", () => {
+      global.navigator.serviceWorker.register = spy
+      // call registerServiceWorker
+      const path = "/hello"
+      const mockOptions = {
+        base: "",
+        csStaticBase: "",
+        logLevel: 0,
+      }
+      registerServiceWorker(navigator, path, mockOptions)
+      // expect spy to have been called
+      expect(spy).toHaveBeenCalled()
+      expect(spy).toHaveBeenCalledTimes(1)
+    })
+
+    it("should log an error if something goes work", () => {
+      const message = "Can't find browser"
+      const path = "/hello"
+      const mockOptions = {
+        base: "",
+        csStaticBase: "",
+        logLevel: 0,
+      }
+      global.navigator.serviceWorker.register = () => {
+        throw new Error(message)
+      }
+
+      registerServiceWorker(navigator, path, mockOptions)
+      expect(loggerSpy).toHaveBeenCalled()
+      expect(loggerSpy).toHaveBeenCalledTimes(1)
+      expect(loggerSpy).toHaveBeenCalledWith(`[Service Worker] failed to register: ${message}`)
+    })
   })
 })