feat: add extensive test suite

app/api/auth/[...all]/handler.ts

@@ -0,0 +1,8 @@
+type AuthHandler = (request: Request) => Response | Promise<Response>;
+
+export function createAuthHandlers<TAuth>(
+  toHandler: (auth: TAuth) => { GET: AuthHandler; POST: AuthHandler },
+  auth: TAuth,
+) {
+  return toHandler(auth);
+}