Simulate failing on after updating react and enzyme version

After updating enzyme version, a lot of tests seem to be failing for no reason. Here’s a change history of my packages -

react: 16.4.2 -> 16.8.4 react-dom: 16.4.2 -> 16.8.4 enzyme: 3.3.0 -> 3.9.0 enzyme-adapter-react-16: 1.1.1 -> 1.11.2 react-test-renderer: 16.8.1 - 16.8.2

• Expected value to be truthy, instead received
  false
  
  51 |     sidebarComp.instance().toggle();
  52 |     sidebarComp.update();
  53 |     **expect(sidebarComp.state().visible).toBeTruthy();**
  54 |   });
  

toggle = () => { this.setState(prevState => { return { visible: !prevState.visible }; }); };

• ShallowWrapper::update() can only be called when wrapping one node
  
  37 |     const expandButton = component.find('button');
  38 |     expect(expandButton).toHaveLength(1);
  39 |     **expandButton.simulate('click');**
  40 |     expect(component.state().expanded).toBeTruthy();
  41 |   });
  42 | });
  

[pgangwani]

@anmoltw : I got it. You have to wrap map(JSX) output with <Fragment> or <> where as I didnt see any issue with SideBar testing

Here you go ==> https://codesandbox.io/s/w6183xxjr8 Refer: Hello.js : Line: 19,25 (wrapping)

I prefer to use props().onClick over simulate (thats Ok for this case) when using shallow mount (which I love too) Please let me know if any other issue after suggested change.

@ljharb Please add explanation/extra details if I missed any.

[ljharb]

@anmoltw sorry for the delay; can you prepare a new sandbox that highlights the remaining issue?