Migrate jest to node:test/node:assert (#161)

.eslintrc.json

@@ -1,5 +1,5 @@
 {
-	"extends": ["stylelint", "stylelint/jest"],
+	"extends": ["stylelint"],
 	"globals": {
 		"module": true,
 		"require": true

__tests__/index.test.mjs

@@ -0,0 +1,68 @@
+import { beforeEach, describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+
+import stylelint from 'stylelint';
+
+import config from '../index.js';
+
+const validScss = readFileSync('./__tests__/valid.scss', 'utf-8');
+const invalidScss = readFileSync('./__tests__/invalid.scss', 'utf-8');
+
+describe('flags no warnings with valid scss', () => {
+	let result;
+
+	beforeEach(async () => {
+		result = await stylelint.lint({
+			code: validScss,
+			config,
+		});
+	});
+
+	it('did not error', () => {
+		assert.equal(result.errored, false);
+	});
+
+	it('flags no warnings', () => {
+		assert.equal(result.results[0].warnings.length, 0);
+	});
+});
+
+describe('flags warnings with invalid scss', () => {
+	let result;
+
+	beforeEach(async () => {
+		result = await stylelint.lint({
+			code: invalidScss,
+			config,
+		});
+	});
+
+	it('did error', () => {
+		assert.equal(result.errored, true);
+	});
+
+	it('flags one warning', () => {
+		assert.equal(result.results[0].warnings.length, 1);
+	});
+
+	it('correct warning text', () => {
+		assert.equal(result.results[0].warnings[0].text, 'Expected variable to be kebab-case');
+	});
+
+	it('correct rule flagged', () => {
+		assert.equal(result.results[0].warnings[0].rule, 'scss/dollar-variable-pattern');
+	});
+
+	it('correct severity flagged', () => {
+		assert.equal(result.results[0].warnings[0].severity, 'error');
+	});
+
+	it('correct line number', () => {
+		assert.equal(result.results[0].warnings[0].line, 1);
+	});
+
+	it('correct column number', () => {
+		assert.equal(result.results[0].warnings[0].column, 1);
+	});
+});