Unit testing with Jest, expect problem receiving empty/undefined object - reactjs

Question

i am new to unit testing and i am trying to test the length of a navigation bar, below you can see the nav bar component which is within a class
<AppBar className={classes.appBar} position="static">
<Toolbar className={classes.toolbar}>
{authenticated && this.state.layoutMode ==='desktop' ? (
<Grid container
direction ="row"
justify="flex-end"
alignItems="center">
<div className={classes.root}>
<Tabs id="Tab" className = {classes.tabBar} value={value} onChange={this.handleChange}>
<Tab label="example" alt="example" onClick={() => Router.push('/example')}/>
<Tab label="example" alt="example" onClick={() => Router.push('/example')}/>
<Tab label="example" alt="example" onClick={() => Router.push('/example')}/>
<Tab label="example" alt="example" onClick={() => Router.push('/example')}/>
<Tab label="example" alt="example" onClick={() => Router.push('/example')}/>
<Tab label="example" alt="example" onClick={() => Router.push('/example')}/>
</Tabs>
</div>
</Grid>
) : (
authenticated && <BurgerMenu/>
)}
Below is the test i have written so far
describe('NavBar', () => {
const intialState = {
ui: { width: 1361 },
auth: { authenticated: true }
}
let container;
beforeEach(() => {
container = shallow(<Nav />);
});
it('should render self and subcomponents', () => {
expect(container).toMatchSnapshot();
});
it('should contain an AppBar', () => {
console.log(container.find(AppBar));
expect(container.find(AppBar)).toHaveLength(1);
});
})
however my problem is that the .find(AppBar) doesnt seem to be found, when using a console log(container.find(AppBar)) it shows the following "ShallowWrapper {}" this would mean that the object is empty and therefore not equal to 1, however i do not know where to point the find to correctly find the tabs to test

Answer 1

The solution is
let container;
beforeEach(() => {
container = mount(<Nav />);
});
diving to deep within the DOM with shallow.