init test stack

.github/workflows/tests.yml

@@ -0,0 +1,16 @@
+name: Run Tests
+
+on:
+  pull_request: ~
+
+jobs:
+  run-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+      - run: corepack enable
+      - run: yarn install --immutable
+      - run: yarn test

package.json

@@ -6,6 +6,7 @@
   "scripts": {
     "dev": "yarn workspace @immutable/devtools-extension run dev",
     "build": "yarn workspaces foreach --all -pt run build",
+    "test": "yarn workspaces foreach --all -pt run test",
     "version": "node build/update-version.js && git add packages/extension/extension/manifest.json && git add packages/*/package.json && yarn"
   },
   "workspaces": [

packages/devtools/jest.config.js

@@ -0,0 +1,7 @@
+/** @type {import('jest').Config} */
+const config = {
+  // ignore the files named "test.js"
+  testPathIgnorePatterns: ['<rootDir>/test.js'],
+};
+
+export default config;

packages/devtools/package.json

@@ -10,7 +10,7 @@
   "scripts": {
     "build": "rollup -c",
     "prepublish": "npm run-script build",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "jest"
   },
   "keywords": [
     "immutable",
@@ -22,9 +22,11 @@
   "devDependencies": {
     "@babel/core": "^7.27.1",
     "@babel/preset-env": "^7.27.2",
+    "@jest/globals": "^29.7.0",
     "@rollup/plugin-babel": "^6.0.4",
     "immutable": "^5.1.2",
     "immutable3": "^3.8.1",
+    "jest": "^29.7.0",
     "rollup": "^4.40.2"
   },
   "engines": {

packages/devtools/src/createFormatter.test.js

@@ -0,0 +1,27 @@
+import { describe, test, expect } from '@jest/globals';
+import { List, isList } from 'immutable';
+import createFormatters from './createFormatters';
+
+describe('List', () => {
+  test('empty List', () => {
+    const list = List();
+
+    const { ListFormatter } = createFormatters({ List, isList });
+
+    const formatted = ListFormatter.header(list);
+    expect(formatted).toEqual([
+      'span',
+      [
+        'span',
+        {
+          style:
+            'color: light-dark(rgb(232,98,0), rgb(255, 150, 50)); position: relative',
+        },
+        'List',
+      ],
+      ['span', '[0]'],
+    ]);
+
+    expect(ListFormatter.hasBody(list)).toBe(false);
+  });
+});

packages/extension/package.json

@@ -5,7 +5,6 @@
   "description": "",
   "exports": "./index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
     "build": "rollup -c",
     "dev": "rollup -c --watch"
   },