diff --git a/tests/javascripts/listEntry.test.js b/tests/javascripts/listEntry.test.js
index d2409d03b..5d11546dc 100644
--- a/tests/javascripts/listEntry.test.js
+++ b/tests/javascripts/listEntry.test.js
@@ -352,4 +352,72 @@ describe("List entry", () => {
 
     });
   });
+
+  describe("getOriginalClasses functionality", () => {
+    test("Should handle inputs without any classes", () => {
+      // Create input without classes
+      document.body.innerHTML = `
+        <div class="input-list" data-module="list-entry" data-list-item-name="domain" id="list-entry-domains">
+          <div class="list-entry">
+            <input type="text" name="domains-1" id="domains-1">
+          </div>
+        </div>`;
+
+      inputList = document.querySelector('.input-list');
+
+      // start module
+      window.GOVUK.modules.start();
+
+      // Check that it handles missing classes gracefully
+      const newInput = inputList.querySelector('.list-entry input');
+      expect(newInput).not.toBeNull();
+    });
+
+    test("Should handle empty input list", () => {
+      // Create div without any inputs
+      document.body.innerHTML = `
+        <div class="input-list" data-module="list-entry" data-list-item-name="domain" id="list-entry-domains">
+        </div>`;
+
+      inputList = document.querySelector('.input-list');
+
+      // This should not throw an error
+      expect(() => {
+        window.GOVUK.modules.start();
+      }).not.toThrow();
+    });
+  });
+
+  describe("getId functionality", () => {
+    test("Should generate IDs correctly with and without number parameter", () => {
+      // Set up a simpler structure to test ID generation
+      document.body.innerHTML = `
+        <div class="input-list" data-module="list-entry" data-list-item-name="test-item" id="list-entry-test">
+          <div class="list-entry">
+            <input type="text" name="test-1" id="test-1" class="usa-input">
+          </div>
+          <div class="list-entry">
+            <input type="text" name="test-2" id="test-2" class="usa-input">
+          </div>
+        </div>`;
+
+      inputList = document.querySelector('.input-list');
+
+      // start module
+      window.GOVUK.modules.start();
+
+      // After module starts, check that IDs are generated correctly
+      // The module will have regenerated the DOM
+      const inputs = inputList.querySelectorAll('input');
+
+      // Check that inputs have proper IDs with numbers
+      expect(inputs[0].id).toEqual("test-1");
+      expect(inputs[1].id).toEqual("test-2");
+
+      // The getId function is called internally during render
+      // We can verify it worked by checking the generated HTML structure
+      expect(inputList.innerHTML).toContain('id="test-1"');
+      expect(inputList.innerHTML).toContain('id="test-2"');
+    });
+  });
 });