feat: add test 🌱

Author: caoxiemeihao

Diff for: package.json

@@ -19,12 +19,14 @@
   "scripts": {
     "dev": "vite build --watch",
     "build": "rm -rf types && tsc --emitDeclarationOnly && vite build",
-    "prepublishOnly": "npm run build"
+    "prepublishOnly": "npm run test && npm run build",
+    "test": "vitest run"
   },
   "dependencies": {},
   "devDependencies": {
     "typescript": "^4.9.4",
     "vite": "^4.0.3",
+    "vitest": "^0.26.2",
     "rollup": "^3.8.1"
   },
   "files": [

Diff for: test/config.test.ts

@@ -0,0 +1,32 @@
+import { builtinModules } from 'node:module'
+import { ExternalOption } from 'rollup'
+import type { InlineConfig } from 'vite'
+import {
+  describe,
+  expect,
+  it,
+} from 'vitest'
+import { withExternalBuiltins } from '../src/config'
+
+const builtins: any[] = builtinModules.filter(e => !e.startsWith('_')); builtins.push('electron', ...builtins.map(m => `node:${m}`))
+const getConfig = (external: ExternalOption): InlineConfig => ({ build: { rollupOptions: { external } } })
+const external_string: ExternalOption = 'electron'
+const external_array: ExternalOption = ['electron']
+const external_regexp: ExternalOption = /electron/
+const external_function: ExternalOption = source => ['electron'].includes(source)
+
+describe('src/config', () => {
+  it('withExternalBuiltins', async () => {
+    const external_str = withExternalBuiltins(getConfig(external_string))!.build!.rollupOptions!.external
+    expect(external_str).toEqual(builtins.concat(external_string))
+
+    const external_arr = withExternalBuiltins(getConfig(external_array))!.build!.rollupOptions!.external
+    expect(external_arr).toEqual(builtins.concat(external_array))
+
+    const external_reg = withExternalBuiltins(getConfig(external_regexp))!.build!.rollupOptions!.external
+    expect(external_reg).toEqual(builtins.concat(external_regexp))
+
+    const external_fun = withExternalBuiltins(getConfig(external_function))!.build!.rollupOptions!.external
+    expect((external_fun as (source: string) => boolean)('electron')).true
+  })
+})