unit tests

client/vitest.config.ts

@@ -0,0 +1,15 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: 'jsdom',
+    setupFiles: ['src/test-setup.ts'],
+    include: ['src/**/*.spec.ts'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'html'],
+      reportsDirectory: './coverage'
+    }
+  }
+});