diff --git a/script.test.js b/script.test.js
new file mode 100644
index 0000000..19012e5
--- /dev/null
+++ b/script.test.js
@@ -0,0 +1,47 @@
+import { JSDOM } from 'jsdom';
+import { expect } from 'chai';
+import script from './script.js';
+
+const { document } = new JSDOM('').window;
+
+describe('generateQR function', () => {
+    beforeEach(() => {
+        document.body.innerHTML = `
+            <input id="text" type="text">
+            <div id="qrcode"></div>
+            <button id="generateButton">Generate QR</button>
+        `;
+    });
+
+    it('should show alert when inputElement.value is null', () => {
+        const inputElement = document.getElementById("text");
+        inputElement.value = null;
+        const generateButton = document.getElementById("generateButton");
+        generateButton.click();
+        expect(document.querySelector('.alert')).to.not.be.null;
+    });
+
+    it('should show alert when inputElement.value is undefined', () => {
+        const inputElement = document.getElementById("text");
+        inputElement.value = undefined;
+        const generateButton = document.getElementById("generateButton");
+        generateButton.click();
+        expect(document.querySelector('.alert')).to.not.be.null;
+    });
+
+    it('should show alert when inputElement.value is empty string', () => {
+        const inputElement = document.getElementById("text");
+        inputElement.value = "";
+        const generateButton = document.getElementById("generateButton");
+        generateButton.click();
+        expect(document.querySelector('.alert')).to.not.be.null;
+    });
+
+    it('should throw error when inputElement.value is not a string', () => {
+        const inputElement = document.getElementById("text");
+        inputElement.value = 123;
+        const generateButton = document.getElementById("generateButton");
+        generateButton.click();
+        expect(window.console.error).to.have.been.called.with("Input must be a string");
+    });
+});
\ No newline at end of file