Can't see React component under test, how to fix?

Question

JavaScript

Hello. I am writing tests for a React app.
There is a class component export class MyComponent extends React.Component
which has a clearState method which clears the state of the component.
in all tutorials they write something like
const MyComponent = shallow();
MyComponent.clearState()
and then see if the state has changed. BUT I have MyComponent in the console empty object {}
Why is MyComponent empty after shallow()?
Tried doing const MyComponent = shallow().instance();
but when calling the MyComponent.clearState() method, the state does not change in any way...