Move template list fixture function into helpers

This will be needed in other tests so should be
made into a helper.

tests/javascripts/support/helpers.js

@@ -13,6 +13,7 @@ exports.RangeMock = domInterfaces.RangeMock;
 exports.SelectionMock = domInterfaces.SelectionMock;
 exports.getRadioGroup = html.getRadioGroup;
 exports.getRadios = html.getRadios;
+exports.templatesAndFoldersCheckboxes = html.templatesAndFoldersCheckboxes;
 exports.element = elements.element;
 exports.WindowMock = rendering.WindowMock;
 exports.ScreenMock = rendering.ScreenMock;

tests/javascripts/support/helpers/html.js

@@ -33,5 +33,31 @@ function getRadioGroup (data) {
     return radioGroup;
 };
 
+function templatesAndFoldersCheckboxes (hierarchy) {
+  let result = '';
+
+  hierarchy.forEach((node, idx) => {
+
+    result += `
+      <div class="template-list-item template-list-item-with-checkbox  template-list-item-without-ancestors">
+        <div class="multiple-choice">
+          <input id="templates-or-folder-${idx}" name="templates_and_folders" type="checkbox" value="templates-or-folder-${idx}">
+          <label></label>
+        </div>
+        <h2 class="message-name">
+          <a href="/services/6658542f-0cad-491f-bec8-ab8457700ead/templates/all/folders/3d057d9a-51fc-45ea-8b63-0003206350a6" class="template-list-${node.type === 'folder' ? 'folder' : 'template'}">
+            <span class="live-search-relevant">${node.label}</span>
+          </a>
+        </h2>
+        ${node.meta}
+      </div>`;
+
+  });
+
+  return result;
+
+};
+
 exports.getRadios = getRadios;
 exports.getRadioGroup = getRadioGroup;
+exports.templatesAndFoldersCheckboxes = templatesAndFoldersCheckboxes;