More test:watch fix: bring upgrade to Jest 27 from TheCleric' closed jest-ts PR

See https://github.com/nativefier/nativefier/pull/1204

package.json

@@ -40,7 +40,7 @@
     "clean": "rimraf lib/ app/lib/ app/dist/",
     "clean:full": "rimraf lib/ app/lib/ app/dist/ app/node_modules/ node_modules/",
     "lint:fix": "eslint . --ext .ts --fix",
-    "lint:format": "prettier --write 'src/**/*.js' 'app/src/**/*.js'",
+    "lint:format": "prettier --write 'src/**/*.ts' 'app/src/**/*.ts'",
     "lint": "eslint . --ext .ts",
     "list-outdated-deps": "npm out; cd app && npm out; true",
     "prepare": "cd app && npm install && cd .. && npm run build",
@@ -66,7 +66,7 @@
     "yargs": "^17.0.1"
   },
   "devDependencies": {
-    "@types/jest": "^26.0.20",
+    "@types/jest": "^26.0.23",
     "@types/ncp": "^2.0.4",
     "@types/node": "^12.12.6",
     "@types/page-icon": "^0.3.3",
@@ -76,7 +76,7 @@
     "eslint": "^7.10.0",
     "eslint-config-prettier": "^8.1.0",
     "eslint-plugin-prettier": "^3.3.1",
-    "jest": "^26.6.3",
+    "jest": "^27.0.3",
     "prettier": "^2.2.1",
     "rimraf": "^3.0.2",
     "ts-loader": "^9.2.1",

src/options/optionsMain.test.ts

@@ -3,12 +3,12 @@ import * as asyncConfig from './asyncConfig';
 import { inferPlatform } from '../infer/inferOs';
 
 const mockedAsyncConfig = { some: 'options' };
-let asyncConfigMock: jasmine.Spy;
+let asyncConfigMock: jest.SpyInstance;
 
 beforeAll(() => {
-  asyncConfigMock = spyOn(asyncConfig, 'asyncConfig').and.returnValue(
-    mockedAsyncConfig,
-  );
+  asyncConfigMock = jest
+    .spyOn(asyncConfig, 'asyncConfig')
+    .mockResolvedValue(mockedAsyncConfig);
 });
 
 test('it should call the async config', async () => {