Update the test

test/src/notebook/notebook/widget.spec.ts

@@ -704,18 +704,13 @@ describe('notebook/notebook/widget', () => {
         });
       });
 
-      it('should focus the cell if switching to edit mode', (done) => {
+      it('should activate if switching to edit mode', (done) => {
         let widget = createActiveWidget();
         Widget.attach(widget, document.body);
         widget.mode = 'edit';
-        let cell = widget.childAt(widget.activeCellIndex);
-        // Wait for update-request.
         requestAnimationFrame(() => {
-          // Notebook activates the editor.
-          requestAnimationFrame(() => {
-            expect(cell.node.contains(document.activeElement)).to.be(true);
-            done();
-          });
+          expect(widget.methods).to.contain('onActivateRequest');
+          done();
         });
       });