feat(register): add test when navigator undefined

test/constants.test.ts

-// 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 { commit, getPackageJson, version } from "../src/node/constants"
 import { loggerModule } from "./helpers"
 

test/register.test.ts

 import { JSDOM } from "jsdom"
 import { loggerModule } from "./helpers"
 
-// jest.mock is hoisted above the imports so we must use `require` here.
-jest.mock("@coder/logger", () => require("./helpers").loggerModule)
-
 describe("register", () => {
-  const { window } = new JSDOM()
-  global.window = (window as unknown) as Window & typeof globalThis
-  global.document = window.document
-  global.navigator = window.navigator
-  global.location = window.location
+  describe("when navigator and serviceWorker are defined", () => {
+    const mockRegisterFn = jest.fn()
 
-  const mockRegisterFn = jest.fn()
+    beforeAll(() => {
+      const { window } = new JSDOM()
+      global.window = (window as unknown) as Window & typeof globalThis
+      global.document = window.document
+      global.navigator = window.navigator
+      global.location = window.location
 
-  beforeAll(() => {
-    Object.defineProperty(global.navigator, "serviceWorker", {
-      value: {
-        register: mockRegisterFn,
-      },
+      Object.defineProperty(global.navigator, "serviceWorker", {
+        value: {
+          register: mockRegisterFn,
+        },
+      })
     })
-  })
 
-  afterEach(() => {
-    mockRegisterFn.mockClear()
-    jest.resetModules()
-  })
+    beforeEach(() => {
+      jest.mock("@coder/logger", () => loggerModule)
+    })
 
-  afterAll(() => {
-    jest.restoreAllMocks()
-  })
+    afterEach(() => {
+      mockRegisterFn.mockClear()
+      jest.resetModules()
+    })
+
+    afterAll(() => {
+      jest.restoreAllMocks()
+
+      // We don't want these to stay around because it can affect other tests
+      global.window = (undefined as unknown) as Window & typeof globalThis
+      global.document = (undefined as unknown) as Document & typeof globalThis
+      global.navigator = (undefined as unknown) as Navigator & typeof globalThis
+      global.location = (undefined as unknown) as Location & typeof globalThis
+    })
 
-  it("should register a ServiceWorker", () => {
-    // Load service worker like you would in the browser
-    require("../src/browser/register")
-    // Load service worker like you would in the browser
-    expect(mockRegisterFn).toHaveBeenCalled()
-    expect(mockRegisterFn).toHaveBeenCalledTimes(1)
+    it("should register a ServiceWorker", () => {
+      // Load service worker like you would in the browser
+      require("../src/browser/register")
+      // Load service worker like you would in the browser
+      expect(mockRegisterFn).toHaveBeenCalled()
+      expect(mockRegisterFn).toHaveBeenCalledTimes(1)
+    })
+
+    it("should log an error if something doesn't work", () => {
+      const message = "Can't find browser"
+      const error = new Error(message)
+
+      mockRegisterFn.mockImplementation(() => {
+        throw error
+      })
+
+      // Load service worker like you would in the browser
+      require("../src/browser/register")
+
+      expect(mockRegisterFn).toHaveBeenCalled()
+      expect(loggerModule.logger.error).toHaveBeenCalled()
+      expect(loggerModule.logger.error).toHaveBeenCalledTimes(1)
+      expect(loggerModule.logger.error).toHaveBeenCalledWith(
+        `[Service Worker] registration: ${error.message} ${error.stack}`,
+      )
+    })
   })
 
-  it("should log an error if something doesn't work", () => {
-    const message = "Can't find browser"
-    const error = new Error(message)
+  describe("when navigator and serviceWorker are NOT defined", () => {
+    let spy: jest.SpyInstance
 
-    mockRegisterFn.mockImplementation(() => {
-      throw error
+    beforeEach(() => {
+      spy = jest.spyOn(console, "error")
     })
 
-    // Load service worker like you would in the browser
-    require("../src/browser/register")
+    afterAll(() => {
+      jest.restoreAllMocks()
+    })
 
-    expect(mockRegisterFn).toHaveBeenCalled()
-    expect(loggerModule.logger.error).toHaveBeenCalled()
-    expect(loggerModule.logger.error).toHaveBeenCalledTimes(1)
-    expect(loggerModule.logger.error).toHaveBeenCalledWith(
-      `[Service Worker] registration: ${error.message} ${error.stack}`,
-    )
+    it("should log an error to the console", () => {
+      // Load service worker like you would in the browser
+      require("../src/browser/register")
+      expect(spy).toHaveBeenCalled()
+      expect(spy).toHaveBeenCalledTimes(1)
+      expect(spy).toHaveBeenCalledWith("[Service Worker] navigator is undefined")
+    })
   })
 })