Can't update value of Office Fabric UI TextField in Enzyme test

Question

I have a React component that uses TextField from office-ui-fabric-react . I'm using Enzyme/Jest to write unit tests. I'm having trouble updating the value of the TextField.

I've tried used .simulate('change', { target: { value: 'Input Value'} }.

Here is my simplified version of my component:

const FeedbackForm = (props: IFeedbackFormProps): JSX.Element => {
  const [comments, setComments] = React.useState<string>('');

  const onCommentChange = (_event: React.FormEvent<HTMLInputElement | HTMLTextAreaElement>, newValue: string): void => {
    setComments(newValue);
  };

  return (
          <TextField
            value={comments}
            onChange={onCommentChange}
          />
  );
};

This is my test:

it('should enable the submit button when the user enters a comment', () => {
     const wrapper = shallow(<FeedbackForm {...mockProps} />);
     const commentBox = wrapper.find(TextField);
     const submitButton = wrapper.find('[type="submit"]');

     commentBox.simulate('change', { target: { value: 'test value' } });

     // This button gets enabled when the text area is not empty
     expect(submitButton.is('[disabled]')).toBe(false);
   });

The UI works as expected. Looking at commentBox.debug(), the component's value doesn't change.

I've also verified that onCommentChange gets called when calling commentBox.simulate(...).

Answer 1

How about to try following ?

commentBox.simulate('change', { target: { id: 'id' } }, 'test value');