feat: Add generated test case

generated.test.js

@@ -0,0 +1,78 @@
+```javascript
+/**
+ * @jest-environment jsdom
+ */
+
+const fs = require('fs');
+const path = require('path');
+const $ = require('jquery');
+
+// --- Mocking global dependencies from main.js ---
+
+// Mock the WOW.js library constructor, as it's not relevant to this test.
+// The script calls `new WOW().init()`, so we need to mock this chain.
+global.WOW = jest.fn(() => ({
+  init: jest.fn(),
+}));
+
+// Mock the owlCarousel jQuery plugin to prevent "is not a function" errors.
+// The script calls this on two different elements.
+$.fn.owlCarousel = jest.fn();
+
+// --- Test Suite Setup ---
+
+// Read the application script file content.
+// This assumes the test file is located in a structure like `tests/main.test.js`
+// relative to the `source code/js/main.js` file.
+const mainJsPath = path.resolve(__dirname, '../../source code/js/main.js');
+const mainJsContent = fs.readFileSync(mainJsPath, 'utf-8');
+
+describe('Sticky Navbar Scroll Behavior', () => {
+
+  beforeEach(() => {
+    // Set up a mock DOM for each test, including the target element.
+    document.body.innerHTML = `
+      <div id="spinner" class="show"></div>
+      <nav class="sticky-top" style="position: fixed; top: -100px;"></nav>
+      <div style="height: 2000px;"></div> <!-- Tall element to simulate a scrollable page -->
+    `;
+
+    // Make jQuery globally available for the script, which expects `(function ($) { ... })(jQuery);`.
+    window.$ = window.jQuery = $;
+
+    // Execute the main.js script in the JSDOM environment by adding it to the DOM.
+    // This attaches the scroll event listener that we want to test.
+    const script = document.createElement('script');
+    script.textContent = mainJsContent;
+    document.body.appendChild(script);
+
+    // Ensure the initial state is correctly set by the script based on the default scroll position.
+    // We set scroll position to 0 and manually trigger the event.
+    $(window).scrollTop(0);
+    $(window).trigger('scroll');
+  });
+
+  afterEach(() => {
+    // Clean up the DOM and mocks to ensure test isolation.
+    document.body.innerHTML = '';
+    jest.clearAllMocks();
+  });
+
+  test('should become visible by adjusting its CSS "top" property when the user scrolls down more than 300 pixels', () => {
+    const stickyNav = $('.sticky-top');
+
+    // ARRANGE: Verify the initial hidden state.
+    // The script's logic should have set the 'top' property to '-100px' because scrollY is 0.
+    expect(stickyNav.css('top')).toBe('-100px');
+
+    // ACT: Simulate the user scrolling down past the 300px threshold.
+    // We programmatically set the scroll position...
+    $(window).scrollTop(301);
+    // ...and then fire the 'scroll' event that our script is listening for.
+    $(window).trigger('scroll');
+
+    // ASSERT: The 'top' property should now be '0px', making the navbar visible.
+    expect(stickyNav.css('top')).toBe('0px');
+  });
+});
+```