Add testing frameworks

vitest.config.ts

@@ -0,0 +1,14 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    environment: "jsdom",
+    setupFiles: ["./tests/setup/vitest.setup.ts"],
+    include: ["tests/**/*.{test,spec}.?(c|m)[jt]s?(x)"],
+    css: false,
+    coverage: {
+      reporter: ["text", "html"],
+      reportsDirectory: "./coverage"
+    }
+  }
+});