diff --git a/script.test.js b/script.test.js
new file mode 100644
index 0000000..1f9207d
--- /dev/null
+++ b/script.test.js
@@ -0,0 +1,46 @@
+describe('generateQR function', () => {
+    let inputElement;
+    let qrCodeDiv;
+    let generateButton;
+    let consoleSpy;
+
+    beforeEach(() => {
+        document.body.innerHTML = `
+            <input id="text" type="text" />
+            <div id="qrcode"></div>
+            <button id="generateButton">Generate QR</button>
+        `;
+        inputElement = document.getElementById("text");
+        qrCodeDiv = document.getElementById("qrcode");
+        generateButton = document.getElementById("generateButton");
+        consoleSpy = jest.spyOn(console, 'error');
+    });
+
+    afterEach(() => {
+        consoleSpy.mockRestore();
+    });
+
+    it('should throw an error when input is null', () => {
+        inputElement.value = null;
+        expect(() => generateQR()).toThrowError('Input must be a string');
+        expect(consoleSpy).not.toHaveBeenCalled();
+    });
+
+    it('should throw an error when input is an empty string', () => {
+        inputElement.value = "";
+        expect(() => generateQR()).toThrowError('Input must be a string');
+        expect(consoleSpy).not.toHaveBeenCalled();
+    });
+
+    it('should throw an error when input is an empty element', () => {
+        inputElement.value = "";
+        expect(() => generateQR()).toThrowError('Input must be a string');
+        expect(consoleSpy).not.toHaveBeenCalled();
+    });
+
+    it('should handle input validation correctly', () => {
+        inputElement.value = "Hello, world!";
+        generateButton.click();
+        expect(consoleSpy).not.toHaveBeenCalled();
+    });
+});
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