diff --git a/pkgs/server/jest.config.js b/pkgs/server/jest.config.js
new file mode 100644
index 0000000..1a94667
--- /dev/null
+++ b/pkgs/server/jest.config.js
@@ -0,0 +1,6 @@
+/** @type {import('jest').Config} */
+module.exports = {
+	transform: {
+		"^.+\\.(t|j)sx?$": "@swc/jest",
+	},
+};
diff --git a/pkgs/server/package.json b/pkgs/server/package.json
index 7eb5f7c..3cafb8d 100644
--- a/pkgs/server/package.json
+++ b/pkgs/server/package.json
@@ -4,7 +4,8 @@
 	"module": "dist/lib.js",
 	"types": "dist/lib.d.ts",
 	"scripts": {
-		"build": "tsc -p tsconfig.build.json"
+		"build": "tsc -p tsconfig.build.json",
+		"test": "jest"
 	},
 	"dependencies": {
 		"@pow-captcha/solver": "workspace:*",
diff --git a/pkgs/server/src/lib.spec.ts b/pkgs/server/src/lib.spec.ts
new file mode 100644
index 0000000..73b918b
--- /dev/null
+++ b/pkgs/server/src/lib.spec.ts
@@ -0,0 +1,31 @@
+import { describe, it, expect } from "@jest/globals";
+import { wire } from "@pow-captcha/shared";
+import * as server from "./lib";
+
+const SECRET = "e2c0b4ab-a215-4b36-bba8-19fae1601045";
+
+describe("server", () => {
+	it("createChallenges ok", async () => {
+		const challengesSigned = await server.createChallenges({}, SECRET);
+
+		await wire.verifyAndDeserializeData(
+			challengesSigned,
+			wire.challengeSchema,
+			SECRET,
+		);
+	});
+
+	it("createChallenges wrong secret", async () => {
+		const challengesSigned = await server.createChallenges({}, SECRET);
+
+		await expect(
+			(async () => {
+				await wire.verifyAndDeserializeData(
+					challengesSigned,
+					wire.challengeSchema,
+					"wrong-secret",
+				);
+			})(),
+		).rejects.toThrow("Signed data verification failed, hash mismatch");
+	});
+});