diff --git a/script.test.js b/script.test.js
new file mode 100644
index 0000000..52c77d1
--- /dev/null
+++ b/script.test.js
@@ -0,0 +1,39 @@
+import { JSDOM } from 'jsdom';
+import { expect } from 'expect';
+import { generateQR } from './script.js';
+
+describe('generateQR function', () => {
+ let dom;
+
+ beforeEach(() => {
+ dom = new JSDOM(`
+
+
+
+
+
+
+
+
+
+ `);
+ globalThis.document = dom.window.document;
+ });
+
+ afterEach(() => {
+ globalThis.document = undefined;
+ });
+
+ it('should alert when input is empty', () => {
+ generateQR();
+ const alertMessage = globalThis.alert;
+ expect(alertMessage).toBe('Please enter text or URL');
+ });
+
+ it('should throw an error when input is not a string', () => {
+ const inputElement = globalThis.document.getElementById('text');
+ inputElement.value = 123;
+ globalThis.document.getElementById('text').value = 123;
+ expect(() => generateQR()).toThrowError('Input must be a string');
+ });
+});
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