diff --git a/package.json b/package.json
index 36e923c..0d0bf21 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
   "scripts": {
     "build": "node scripts/extract-chains.js",
     "prepublishOnly": "npm run build",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "node test/clone.test.js"
   },
   "keywords": [
     "clone",
diff --git a/test/clone.test.js b/test/clone.test.js
new file mode 100644
index 0000000..00554f9
--- /dev/null
+++ b/test/clone.test.js
@@ -0,0 +1,29 @@
+import { describe, it, expect } from "vitest";
+
+describe("clone-contract", () => {
+  describe("URL parsing", () => {
+    it("should parse Etherscan URL", () => {
+      const url = "https://etherscan.io/address/0x1234567890123456789012345678901234567890";
+      // Simple validation test
+      expect(url).toContain("etherscan.io");
+      expect(url).toContain("0x1234567890123456789012345678901234567890");
+    });
+
+    it("should parse Blockscan URL", () => {
+      const url = "https://vscode.blockscan.com/ethereum/0x1234567890123456789012345678901234567890";
+      expect(url).toContain("blockscan.com");
+      expect(url).toContain("ethereum");
+    });
+
+    it("should validate contract address format", () => {
+      const validAddress = "0x1234567890123456789012345678901234567890";
+      const invalidAddress = "1234567890";
+      
+      const isValid = /^0x[a-fA-F0-9]{40}$/.test(validAddress);
+      const isInvalid = /^0x[a-fA-F0-9]{40}$/.test(invalidAddress);
+      
+      expect(isValid).toBe(true);
+      expect(isInvalid).toBe(false);
+    });
+  });
+});