Replace jest with the node built-in test runner

.eslintrc.cjs

@@ -18,11 +18,4 @@ module.exports = {
       {ignores: ['dynamicImport']},
     ],
   },
-  overrides: [
-    {
-      files: ['**/*.test.js'],
-      env: {jest: true},
-      globals: {testRule: true},
-    },
-  ],
 };

.github/CONTRIBUTING.md

@@ -18,9 +18,7 @@ yarn run test
 
 This is a [Stylelint](https://stylelint.io/) plugin. Documentation for the APIs that it uses can be found on Stylelint's [Writing Plugins](https://stylelint.io/developer-guide/plugins/) page.
 
-Linting is ran as part of `yarn run test`. The build will fail if there are any linting errors. You can run `yarn run lint --fix` to fix some linting errors (including formatting to match prettier's expectations). To run the tests without linting run `yarn run jest`.
-
-This plugin is used to lint itself. The style is checked when `npm test` is run, and the build will fail if there are any linting errors. You can use `npm run lint -- --fix` to fix some linting errors. To run the tests without running the linter, you can use `node_modules/.bin/mocha`.
+Linting is ran as part of `yarn run test`. The build will fail if there are any linting errors. You can run `yarn run lint --fix` to fix some linting errors (including formatting to match prettier's expectations). To run the tests without linting run `node --test test/*.test.js`.
 
 ### End to end tests
 

package.json

@@ -21,7 +21,7 @@
   },
   "scripts": {
     "lint": "eslint .",
-    "test": "yarn run lint && node --experimental-vm-modules node_modules/jest/bin/jest.js",
+    "test": "yarn run lint && node --test test/*.test.js",
     "format": "yarn run prettier '**/*.{js,json,md}' --write && yarn run lint --fix"
   },
   "repository": {
@@ -44,8 +44,6 @@
     "eslint-config-prettier": "^9.0.0",
     "eslint-plugin-n": "^15.7.0",
     "eslint-plugin-prettier": "^5.0.0",
-    "jest": "^29.6.1",
-    "jest-preset-stylelint": "^7.0.0",
     "postcss": "^8.4.25",
     "postcss-html": "^1.5.0",
     "postcss-markdown": "^1.2.0",
@@ -57,18 +55,12 @@
     "prettier-plugin-svelte": "^3.0.0",
     "strip-ansi": "^6.0.0",
     "stylelint": "^16.0.1",
+    "stylelint-test-rule-node": "^0.2.0",
     "svelte": "^4.1.0",
     "typescript": "5.3.2"
   },
   "engines": {
     "node": ">=18.12.0"
   },
-  "jest": {
-    "preset": "jest-preset-stylelint",
-    "transform": {},
-    "setupFiles": [
-      "./jest-setup.js"
-    ]
-  },
   "license": "MIT"
 }

test/stylelint-prettier-e2e.test.js

@@ -1,3 +1,5 @@
+import {describe, test} from 'node:test';
+import assert from 'node:assert/strict';
 import {spawnSync} from 'node:child_process';
 import {resolve, dirname} from 'node:path';
 import {fileURLToPath} from 'node:url';
@@ -22,9 +24,9 @@ check.invalid.css
 1 problem (1 error, 0 warnings)
 `.trim();
 
-    expect(result.output).toEqual('');
-    expect(result.error).toEqual(expectedResult);
-    expect(result.status).toEqual(2);
+    assert.strictEqual(result.output, '');
+    assert.strictEqual(result.error, expectedResult);
+    assert.strictEqual(result.status, 2);
   });
 
   test('SCSS files', () => {
@@ -38,9 +40,9 @@ check.invalid.scss
 2 problems (2 errors, 0 warnings)
 `.trim();
 
-    expect(result.output).toEqual('');
-    expect(result.error).toEqual(expectedResult);
-    expect(result.status).toEqual(2);
+    assert.strictEqual(result.output, '');
+    assert.strictEqual(result.error, expectedResult);
+    assert.strictEqual(result.status, 2);
   });
 
   /**
@@ -52,9 +54,9 @@ check.invalid.scss
 
     const expectedResult = ``;
 
-    expect(result.output).toEqual('');
-    expect(result.error).toEqual(expectedResult);
-    expect(result.status).toEqual(0);
+    assert.strictEqual(result.output, '');
+    assert.strictEqual(result.error, expectedResult);
+    assert.strictEqual(result.status, 0);
   });
 
   /**
@@ -66,9 +68,9 @@ check.invalid.scss
 
     const expectedResult = ``;
 
-    expect(result.output).toEqual('');
-    expect(result.error).toEqual(expectedResult);
-    expect(result.status).toEqual(0);
+    assert.strictEqual(result.output, '');
+    assert.strictEqual(result.error, expectedResult);
+    assert.strictEqual(result.status, 0);
   });
 });
 

test/stylelint-prettier.test.js

@@ -1,13 +1,18 @@
+import {describe, it, beforeEach, afterEach, mock} from 'node:test';
+import assert from 'node:assert/strict';
 import path from 'node:path';
 import {fileURLToPath} from 'node:url';
 import stylelint from 'stylelint';
+import {testRule} from 'stylelint-test-rule-node';
 import plugin from '../index.js';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const plugins = [plugin];
 const {ruleName} = plugin;
 
 // Reading from default .prettierrc
 testRule({
+  plugins,
   ruleName,
   config: true,
   codeFilename: filename('default'),
@@ -56,6 +61,7 @@ testRule({
 
 // Reading from custom .prettierrc
 testRule({
+  plugins,
   ruleName,
   config: true,
   codeFilename: filename('custom'),
@@ -104,6 +110,7 @@ testRule({
 
 // Merging options from config into .prettierrc
 testRule({
+  plugins,
   ruleName,
   config: [true, {tabWidth: 8}],
   codeFilename: filename('default'),
@@ -152,6 +159,7 @@ testRule({
 
 // Use the css parser if no filename was specified
 testRule({
+  plugins,
   ruleName,
   config: true,
   fix: true,
@@ -178,6 +186,7 @@ testRule({
 
 // Use the parser specified in overrides in .prettierrc
 testRule({
+  plugins,
   ruleName,
   config: true,
   customSyntax: 'postcss',
@@ -204,6 +213,7 @@ testRule({
 
 // Ignoring files in .prettierignore
 testRule({
+  plugins,
   ruleName,
   config: true,
   codeFilename: filename('default', 'ignore-me.css'),
@@ -217,6 +227,7 @@ testRule({
 
 // Testing Comments
 testRule({
+  plugins,
   ruleName,
   config: [true, {endOfLine: 'auto'}],
   codeFilename: filename('default'),
@@ -338,6 +349,7 @@ const stressTestCssExpected = `.foo {
 `;
 
 testRule({
+  plugins,
   ruleName,
   config: true,
   codeFilename: filename('default'),
@@ -573,6 +585,7 @@ $pip-animation: (
 `;
 
 testRule({
+  plugins,
   ruleName,
   config: true,
   codeFilename: filename('default', 'dummy.scss'),
@@ -620,6 +633,7 @@ testRule({
 
 // Test trailing commas in near-empty scss files
 testRule({
+  plugins,
   ruleName,
   config: [true, {trailingComma: 'all'}],
   codeFilename: filename('default', 'dummy.scss'),
@@ -648,6 +662,7 @@ testRule({
 
 // Passing a syntax works
 testRule({
+  plugins,
   ruleName,
   config: [true, {parser: 'scss', trailingComma: 'all'}],
   customSyntax: 'postcss-scss',
@@ -674,6 +689,7 @@ testRule({
 
 // EOL Tests
 testRule({
+  plugins,
   ruleName,
   config: [true, {endOfLine: 'auto'}],
   fix: true,
@@ -714,15 +730,15 @@ testRule({
 describe('stylelint configurations', () => {
   const oldWarn = console.warn;
   beforeEach(() => {
-    console.warn = jest.fn(console.warn);
+    console.warn = mock.fn(console.warn);
   });
 
   afterEach(() => {
     console.warn = oldWarn;
   });
 
-  it("doesn't raise prettier warnings on `message`", () => {
-    const linted = stylelint.lint({
+  it("doesn't raise prettier warnings on `message`", async () => {
+    await stylelint.lint({
       code: ``,
       config: {
         plugins: ['./'],
@@ -732,15 +748,11 @@ describe('stylelint configurations', () => {
       },
     });
 
-    return linted.then(() => {
-      expect(console.warn).not.toHaveBeenCalledWith(
-        expect.stringMatching(/ignored unknown option.+message/i)
-      );
-    });
+    assert.strictEqual(console.warn.mock.calls.length, 0);
   });
 
-  it("doesn't raise prettier warnings on `severity`", () => {
-    const linted = stylelint.lint({
+  it("doesn't raise prettier warnings on `severity`", async () => {
+    await stylelint.lint({
       code: ``,
       config: {
         plugins: ['./'],
@@ -750,11 +762,7 @@ describe('stylelint configurations', () => {
       },
     });
 
-    return linted.then(() => {
-      expect(console.warn).not.toHaveBeenCalledWith(
-        expect.stringMatching(/ignored unknown option.+severity/i)
-      );
-    });
+    assert.strictEqual(console.warn.mock.calls.length, 0);
   });
 });