Add failing test for attributes not available in didRender

tests/integration/components/angle-bracket-invocation-test.js

@@ -476,5 +476,25 @@ module('Integration | Component | angle-bracket-invocation', function(hooks) {
         assert.dom('span').hasAttribute('data-right', 'right-inner');
       });
     }
+
+    test('attributes are available in didRender', async function(assert) {
+      assert.expect(2);
+      this.owner.register(
+        'template:components/foo-bar',
+        hbs`<span data-test-inner ...attributes>hi martin!</span>`
+      );
+      this.owner.register(
+        'component:foo-bar',
+        Component.extend({
+          tagName: '',
+          didRender() {
+            assert.dom('span').hasAttribute('data-test-inner');
+            assert.dom('span').hasAttribute('data-test-outer');
+          },
+        })
+      );
+
+      await render(hbs`<FooBar data-test-outer />`);
+    });
   });
 });