Comment réparer l'erreur `TypeError: document.createRange n'est pas une fonction` lors du test de popper d'interface utilisateur avec react-testing-library?

Question

J'ai un material-ui TextField qui sur le focus ouvre un Popper. J'essaye de tester ce comportement en utilisant react-testing-library.

Composant:

import ClickAwayListener from '@material-ui/core/ClickAwayListener';
import Grow from '@material-ui/core/Grow';
import Paper from '@material-ui/core/Paper';
import Popper from '@material-ui/core/Popper';
import TextField from '@material-ui/core/TextField';
import React from 'react';
import { ItemType } from './types';

export type TextFieldDropDownProps = {
    items: ItemType,
};

export function TextFieldDropDown(props: TextFieldDropDownProps) {
    const [searchTerm, setSearchTerm] = React.useState('');
    const [anchorEl, setAnchorEl] = React.useState(null);

    const handleSearchTermChange = (event: any) => {
        setSearchTerm(event.target.value);
    };

    const onFoucs = (event: any) => {
        setAnchorEl(event.currentTarget);
    };

    const handleClose = (event: any) => {
        setAnchorEl(null);
    };

    const popperTrans = ({ TransitionProps }: any) => {
        return (
          <Grow
            {...TransitionProps}
            style={{ transformOrigin: '0 0 0' }}
          >
            <Paper>
              <ul />
            </Paper>
          </Grow>
        );
    };

    const open = Boolean(anchorEl);
    return (
        <ClickAwayListener onClickAway={handleClose}>
            <div>
                <TextField
                    onChange={handleSearchTermChange}
                    onFocus={onFoucs}
                    value={searchTerm}
                    label='Search'
                />
                <Popper
                    open={open}
                    anchorEl={anchorEl}
                    transition={true}
                    disablePortal={true}
                    placement='bottom-start'
                    style={{zIndex: 999, minWidth: '100%'}}
                >
                    {popperTrans}
                </Popper>
            </div>
        </ClickAwayListener>
    );
}

Test:

import { fireEvent, render, wait } from '@testing-library/react';
import { getTestData } from 'test-data';
import React from 'react';
import { TextFieldDropDown } from './TextFieldDropDown';

test('that on focus on input field, the component shows a dropdown', async () => {
    // Set up test data
    const items: any = getTestData();

    // Render component
    const props = { items };
    const { getByRole, queryByRole } = render(<TextFieldDropDown {...props} />, {});
    await wait();

    expect(queryByRole('list')).toBeNull();

    // Fire event
    const placeSelectInputField = getByRole('textbox') as HTMLInputElement;
    fireEvent.focus(placeSelectInputField);

    // Verify that dropdown is shown
    expect(queryByRole('list')).toBeInTheDocument();

});

Lorsque j'exécute le test, j'obtiens l'erreur suivante - TypeError: document.createRange is not a function.

      The above error occurred in the <div> component:
          in div (created by ForwardRef(Portal))
          in ForwardRef(Portal) (created by ForwardRef(Popper))
          in ForwardRef(Popper) (created by TextFieldDropDown)
          in div (created by ForwardRef(ClickAwayListener))
          in ForwardRef(ClickAwayListener) (created by TextFieldDropDown)
          in TextFieldDropDown
          in Provider (created by AllTheProviders)
          in AllTheProviders

      Consider adding an error boundary to your tree to customize error handling behavior.

      The above error occurred in the <ForwardRef(Popper)> component:
          in ForwardRef(Popper) (created by TextFieldDropDown)
          in div (created by ForwardRef(ClickAwayListener))
          in ForwardRef(ClickAwayListener) (created by TextFieldDropDown)
          in TextFieldDropDown
          in Provider (created by AllTheProviders)
          in AllTheProviders

      Consider adding an error boundary to your tree to customize error handling behavior.


  ● that on focus on input field, the component shows a dropdown

    TypeError: document.createRange is not a function

      46 |     // Fire event
      47 |     const TextFieldComponent = getByRole('textbox') as HTMLInputElement;
    > 48 |     fireEvent.focus(TextFieldComponent);
         |               ^
      49 |
      50 |     // Verify that dropdown is shown
      51 |     expect(queryByRole('list')).toBeInTheDocument();

Comment faire fonctionner cela?

Answer 1

Le problème vient de l'implémentation sous-jacente de PopperJS appelant le document.createRange fonction lorsqu'il n'y a pas d'API DOM à appeler. La solution est de se moquer de PopperJS.

// __mocks__/popper.js.js

import PopperJs from 'popper.js';

export default class Popper {
    constructor() {
        this.placements = PopperJs.placements;

        return {
            update: () => {},
            destroy: () => {},
            scheduleUpdate: () => {}
        };
    }
}

jest choisira tous les mocks dans le /__mocks__ répertoire automatiquement, donc simplement ajouter ce fichier devrait résoudre votre problème