🧑‍🔬 Migrate to vitest for testing

Author: himynameisdave

jest.config.js

@@ -5,8 +5,8 @@
   "scripts": {
     "build": "rollup -c -m --bundleConfigAsCjs",
     "prepublishOnly": "npm run build",
-    "test": "jest",
-    "test:watch": "jest --watch",
+    "test": "vitest run",
+    "test:watch": "vitest",
     "release": "np --no-yarn"
   },
   "dependencies": {
@@ -16,14 +16,14 @@
   "devDependencies": {
     "@rollup/plugin-commonjs": "28.0.6",
     "@rollup/plugin-node-resolve": "16.0.1",
-    "@testing-library/jest-dom": "5.17.0",
+    "@sveltejs/vite-plugin-svelte": "^1.4.0",
     "@testing-library/svelte": "3.2.2",
-    "jest": "30.1.3",
-    "jest-environment-jsdom": "30.1.2",
-    "jest-transform-svelte": "2.1.1",
+    "@vitest/ui": "^2.1.8",
+    "jsdom": "^25.0.1",
     "np": "10.2.0",
     "rollup": "4.51.0",
-    "rollup-plugin-svelte": "7.2.3"
+    "rollup-plugin-svelte": "7.2.3",
+    "vitest": "^2.1.8"
   },
   "peerDependencies": {
     "svelte": "^3.0.0"

package.json

@@ -1,13 +1,12 @@
-require('@testing-library/jest-dom/extend-expect');
-const { cleanup, render } = require('@testing-library/svelte');
-const App = require('../__fixtures__/Base.fixture.svelte');
-
+import { cleanup, render } from '@testing-library/svelte';
+import { beforeEach, describe, it, expect } from 'vitest';
+import App from '../__fixtures__/Base.fixture.svelte';
 
 beforeEach(cleanup);
 
 describe('BaseChart', () => {
   it('renders the chart without crashing', () => {
     const { getByText } = render(App);
-    expect(getByText('Chart')).toBeInTheDocument();
+    expect(getByText('Chart')).toBeDefined();
   });
 });

src/__tests__/Base.test.js

@@ -0,0 +1,10 @@
+import { defineConfig } from 'vitest/config';
+import { svelte } from '@sveltejs/vite-plugin-svelte';
+
+export default defineConfig({
+  plugins: [svelte()],
+  test: {
+    environment: 'jsdom',
+    setupFiles: ['./setupTests.js']
+  }
+});