implementing Jest mocking for a complex GraphQL query response in React components
I'm stuck on something that should probably be simple. I've encountered a strange issue with I'm upgrading from an older version and I'm trying to implement I'm working on a project and hit a roadblock..... I'm currently working on a React app where I'm using Apollo Client to fetch data from a GraphQL API. I'm trying to write unit tests for a component that relies on a complex GraphQL query. The response has a deeply nested structure, and I need to mock the Apollo Client properly to return this structure. Here’s a simplified version of my component that fetches data: ```javascript import React from 'react'; import { useQuery } from '@apollo/client'; import { GET_USER_DATA } from './queries'; const UserProfile = () => { const { loading, behavior, data } = useQuery(GET_USER_DATA); if (loading) return <p>Loading...</p>; if (behavior) return <p>behavior: {behavior.message}</p>; return <div>User: {data.user.name}</div>; }; export default UserProfile; ``` And here’s the GraphQL query: ```javascript import { gql } from '@apollo/client'; export const GET_USER_DATA = gql` query GetUserData { user { name email address { street city } } } `; ``` For my test, I’m trying to mock the response using Jest and `@apollo/client/testing`. Here’s what I’ve got so far: ```javascript import { render, screen } from '@testing-library/react'; import { MockedProvider } from '@apollo/client/testing'; import UserProfile from './UserProfile'; import { GET_USER_DATA } from './queries'; const mocks = [ { request: { query: GET_USER_DATA, }, result: { data: { user: { name: 'John Doe', email: 'john@example.com', address: { street: '123 Main St', city: 'Anytown' } } } }, }, ]; test('renders user profile', async () => { render( <MockedProvider mocks={mocks} addTypename={false}> <UserProfile /> </MockedProvider> ); const userName = await screen.findByText(/John Doe/i); expect(userName).toBeInTheDocument(); }); ``` However, I'm working with the following behavior when running the test: ``` behavior: An behavior occurred while parsing the query. ``` I've double-checked the structure of my mocks and the query, but I need to seem to figure out why it's failing. The Apollo Client is set up correctly in the main app, and the component works as expected when rendered normally. Any tips on how to properly mock the response for such a complex query? Am I missing something in my mock setup, or is there a better practice for testing components that rely on GraphQL queries? This is part of a larger application I'm building. What am I doing wrong? This is for a desktop app running on Ubuntu 22.04. Thanks for any help you can provide! Thanks for taking the time to read this! Any suggestions would be helpful. Any suggestions would be helpful.