feat(e2e): Add AppAction to expand the entire tree

e2e/appActions.js

@@ -189,6 +189,20 @@ async function openObjectTreeContextMenu(page, url) {
     });
 }
 
+/**
+ * Expands the entire object tree (every expandable tree item).
+ * @param {import('@playwright/test').Page} page
+ */
+async function expandEntireTree(page) {
+    const treePane = page.locator('#tree-pane');
+    const collapsedTreeItems = treePane.locator('role=treeitem[expanded=false]');
+    let count = await collapsedTreeItems.count();
+    while (count > 0) {
+        await collapsedTreeItems.first().locator('.c-disclosure-triangle').click();
+        count = await collapsedTreeItems.count();
+    }
+}
+
 /**
  * Gets the UUID of the currently focused object by parsing the current URL
  * and returning the last UUID in the path.
@@ -332,6 +346,7 @@ async function setEndOffset(page, offset) {
 module.exports = {
     createDomainObjectWithDefaults,
     expandTreePaneItemByName,
+    expandEntireTree,
     createPlanFromJSON,
     openObjectTreeContextMenu,
     getHashUrlToDomainObject,