Add Jest tests

.github/workflows/build-and-test.yml

@@ -0,0 +1,27 @@
+name: Build and Test
+
+on:
+  push:
+    branches: main
+  pull_request:
+    branches: "*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-node@v2
+        with:
+          node-version: "16"
+      - uses: pnpm/[email protected]
+        with:
+          version: 8.4.0
+      - run: git checkout main && git checkout $GITHUB_SHA
+      - run: pnpm install --frozen-lockfile
+      - run: pnpm run build
+      - run: pnpm run lint
+      - run: pnpm run test-jest

jest.config.cjs

@@ -0,0 +1,9 @@
+/** @type {import('jest').Config} */
+const config = {
+  testEnvironment: "jsdom",
+  resetMocks: true,
+  restoreMocks: true,
+  setupFilesAfterEnv: ["<rootDir>/jest.setup.js"],
+};
+
+module.exports = config;

jest.setup.js

@@ -0,0 +1,4 @@
+import { TextEncoder, TextDecoder } from "util";
+
+global.TextEncoder = TextEncoder;
+global.TextDecoder = TextDecoder;

package.json

@@ -12,6 +12,7 @@
     "clean": "rimraf dist",
     "watch": "cross-env NODE_ENV=development rollup -c --watch",
     "copy-test-files": "copyfiles test/**/* dist -f",
+    "test-jest": "jest",
     "test-serve": "serve .",
     "test-embed-serve": "serve . -l 3333",
     "test": "concurrently pnpm:watch pnpm:copy-test-files pnpm:test-serve pnpm:test-embed-serve",
@@ -43,16 +44,20 @@
     "@rollup/plugin-babel": "^5.3.0",
     "@rollup/plugin-node-resolve": "^13.0.2",
     "concurrently": "^6.2.0",
-    "copyfiles": "^2.3.0",
-    "cross-env": "^7.0.2",
+    "copyfiles": "^2.4.1",
+    "cross-env": "^7.0.3",
     "eslint": "^7.31.0",
     "eslint-config-important-stuff": "^1.1.0",
     "eslint-plugin-es5": "^1.5.0",
-    "husky": "^7.0.0",
+    "husky": "^7.0.1",
+    "jest": "^29.5.0",
+    "jest-cli": "^29.5.0",
+    "jest-environment-jsdom": "^29.5.0",
     "postcss": "^8.3.5",
     "preact": "^10.5.14",
     "prettier": "^2.3.2",
     "pretty-quick": "^3.1.1",
+    "regenerator-runtime": "^0.13.11",
     "rimraf": "^3.0.2",
     "rollup": "^2.53.2",
     "rollup-plugin-postcss": "^4.0.0",