Test updates

tests/javascripts/fileUpload.domLoad.test.js

@@ -0,0 +1,26 @@
+// This will use the real function and listener
+const {
+  initUploadStatusAnnouncer
+} = require('../../app/assets/javascripts/fileUpload.js');
+
+jest.useFakeTimers();
+
+test('writes upload message to the live region on DOMContentLoaded', () => {
+  // Setup the DOM
+  document.body.innerHTML = `
+    <div id="upload-status-live" aria-live="assertive" role="status" class="usa-sr-only">Old message</div>
+    <span id="upload-success" class="usa-sr-only">File upload successful</span>
+  `;
+
+  // Register the listener (same as page load does)
+  initUploadStatusAnnouncer();
+
+  // Simulate the page load event
+  document.dispatchEvent(new Event('DOMContentLoaded'));
+
+  // Live region will be cleared first, then updated
+  jest.advanceTimersByTime(50);
+
+  const srRegion = document.getElementById('upload-status-live');
+  expect(srRegion.textContent).toBe('File upload successful');
+});