added unit test framework

vitest.config.ts

@@ -1,12 +1,29 @@
 import { defineConfig } from "vitest/config";
 import react from "@vitejs/plugin-react";
+import path from "path";
 
 export default defineConfig({
   plugins: [react()],
+  resolve: {
+    alias: {
+      "@": path.resolve(__dirname, "./"),
+    },
+  },
   test: {
     globals: true,
     environment: "jsdom",
     setupFiles: "./vitest.setup.ts",
-    include: ["**/*.test.{ts,tsx}"],
+    include: ["tests/**/*.test.{ts,tsx}"],
+    coverage: {
+      provider: "v8",
+      reporter: ["text", "lcov"],
+      include: [
+        "src/app/api/**",
+        "src/hooks/**",
+        "src/modules/**/schemas/**",
+        "src/modules/**/validation/**",
+        "src/lib/**",
+      ],
+    },
   },
 });