feat(tests): integrate Vitest for testing framework and add test scripts

- Added Vitest as a dependency for improved testing capabilities.
- Updated package.json with new test scripts for running tests, watching, and coverage reporting.
- Configured ESLint to recognize test runner scripts and included them in the linting process.
- Modified tsconfig.json to include Vitest types for better TypeScript support in tests.

scripts/test-runner.js

@@ -0,0 +1,62 @@
+#!/usr/bin/env node
+/**
+ * Script pour gérer PostCSS pendant les tests
+ * Renomme temporairement postcss.config.mjs pour éviter les erreurs Vitest
+ */
+
+const fs = require('fs');
+const path = require('path');
+const { spawn } = require('child_process');
+
+const postcssConfigPath = path.join(process.cwd(), 'postcss.config.mjs');
+const postcssConfigBackupPath = path.join(
+  process.cwd(),
+  'postcss.config.mjs.testbak'
+);
+
+// Fonction pour restaurer le fichier
+function restorePostCSS() {
+  if (fs.existsSync(postcssConfigBackupPath)) {
+    fs.renameSync(postcssConfigBackupPath, postcssConfigPath);
+    console.log('✓ PostCSS config restauré');
+  }
+}
+
+// Renommer le fichier PostCSS avant les tests
+if (fs.existsSync(postcssConfigPath)) {
+  fs.renameSync(postcssConfigPath, postcssConfigBackupPath);
+  console.log('✓ PostCSS config temporairement désactivé pour les tests');
+
+  // Lancer Vitest avec reporter verbose pour plus de détails
+  const vitest = spawn('pnpm', ['vitest', '--run', '--reporter=verbose'], {
+    stdio: 'inherit',
+  });
+
+  // Restaurer le fichier après que Vitest ait terminé
+  vitest.on('close', (code) => {
+    restorePostCSS();
+    process.exit(code || 0);
+  });
+
+  // Gérer les signaux d'interruption
+  process.on('SIGINT', () => {
+    vitest.kill('SIGINT');
+    restorePostCSS();
+    process.exit(0);
+  });
+
+  process.on('SIGTERM', () => {
+    vitest.kill('SIGTERM');
+    restorePostCSS();
+    process.exit(0);
+  });
+} else {
+  // Si le fichier n'existe pas, lancer Vitest directement
+  const vitest = spawn('pnpm', ['vitest', '--run'], {
+    stdio: 'inherit',
+  });
+
+  vitest.on('close', (code) => {
+    process.exit(code || 0);
+  });
+}