Add test coverage command

vitest.config.ts

@@ -0,0 +1,19 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'json', 'html'],
+      exclude: [
+        'node_modules/**',
+        'dist/**',
+        '**/*.d.ts',
+        '**/*.config.ts',
+        '**/*.test.ts',
+        '**/*.spec.ts',
+        'output/**'
+      ],
+    },
+  },
+});