added todo for testing get-element when invalid callback is supplied

packages/test-app/tests/integration/modifiers/get-element-test.js

@@ -1,4 +1,4 @@
-import { module, test } from 'qunit';
+import { module, test, todo } from 'qunit';
 import { setupRenderingTest } from 'test-app/tests/helpers';
 import { render } from '@ember/test-helpers';
 import { hbs } from 'ember-cli-htmlbars';
@@ -16,10 +16,16 @@ module('Integration | Modifier | get-element', function (hooks) {
     assert.strictEqual(this.rootElement, document.getElementById('root-element'));
   });
 
-  test('it fails when no callback is given', async function (assert) {
-    this.rootElement = null;
-    assert.strictEqual(this.rootElement, null);
-    await render(hbs`<div id='root-element' {{get-element}}></div>`);
-    assert.strictEqual(this.rootElement, null);
+  todo('it fails when no callback is given', async function (assert) {
+    assert.expect(1);
+
+    // const renderWithoutCallback = async () => {
+    //   await render(hbs`<div {{get-element}}></div>`);
+    // };
+    // assert.throws(
+    //   renderWithoutCallback,
+    //   /get-element modifier expects a valid callback as the first positional argument/,
+    //   'Throws an error when invalid callback is provided',
+    // );
   });
 });