Unit test node-env.ts

- Added unit test case for module `node-env.ts`.
- Set flag `--experimental-vm-modules` to Node when running `Jest`.
- Modified package's `jest` script to clear cache before running the tests, as
the process may got stuck at loading the dynamic import without cleaning the
cache first.

Author: iamWing

package.json

@@ -8,7 +8,7 @@
     "start": "electron ./dist/main.bundle.js",
     "dev": "rimraf dist && cross-env NODE_ENV=development webpack --watch --progress --color",
     "prod": "rimraf dist && cross-env NODE_ENV=production webpack --progress --color",
-    "test": "cross-env NODE_ENV=test jest",
+    "test": "jest --clearCache && cross-env NODE_ENV=test NODE_OPTIONS=--experimental-vm-modules jest",
     "watch-test": "npm run test -- --watchAll",
     "next-rc": "npm --no-git-tag-version version prerelease --preid=rc",
     "next-patch": "npm --no-git-tag-version version patch",

tests/utils/node-env.spec.ts

@@ -0,0 +1,34 @@
+import { jest } from '@jest/globals';
+
+test('NODE_ENV=test', async () => {
+  process.env.NODE_ENV = 'test';
+  jest.resetModules();
+
+  const nodeEnv = await import('_utils/node-env.js');
+
+  expect(nodeEnv.test).toBeTruthy();
+  expect(nodeEnv.dev).toBeFalsy();
+  expect(nodeEnv.prod).toBeFalsy();
+});
+
+test('NODE_ENV=development', async () => {
+  process.env.NODE_ENV = 'development';
+  jest.resetModules();
+
+  const nodeEnv = await import('_utils/node-env.js');
+
+  expect(nodeEnv.dev).toBeTruthy();
+  expect(nodeEnv.prod).toBeFalsy();
+  expect(nodeEnv.test).toBeFalsy();
+});
+
+test('NODE_ENV=production', async () => {
+  process.env.NODE_ENV = 'production';
+  jest.resetModules();
+
+  const nodeEnv = await import('_utils/node-env.js');
+
+  expect(nodeEnv.prod).toBeTruthy();
+  expect(nodeEnv.dev).toBeFalsy();
+  expect(nodeEnv.test).toBeFalsy();
+});