react-apollo-async-testing

Beta: A lightweight way to test your Mutation and Query components in React Apollo (react-apollo).

Install & Usage

On the command line:

npm install --save-dev react-apollo-async-testing

The following test examples showcase this library by using Jest as assertion and test runner library and Enzyme for the actual component renderings and utilities. But Enzyme can be replaced by react-test-renderer as well.

API:

// creates a Apollo Client with sensible defaults (e.g. apollo-cache-inmemory, apollo-http-link)
// just an optional function, you can create your own Apollo Client instance too
// afterward, client instance can be used in the ApolloProvider
const client = createApolloClient('https://api.github.com/graphql');

// enables GraphQL API mocking
// define the GraphQL endpoint URI
// specify a payload object which has a query (and optional variables and operation name)
// specify a result which you would expect from this query
const promise = stubQueryWith(uri, payload, result);

// injects a spied function into the Mutation(s) component(s)
// check sinon library API to interact with the spy
const sinonSpy = injectSpyInMutation();

Query Testing:

The desired goal is to keep you in control of what data should be returned for which request. In addition, you need to be in charge to mimic the different stages of the request by having control over a promise (e.g. pending request, resolved request).

In your application:

import React from 'react';
import gql from 'graphql-tag';
import { Query } from 'react-apollo';

import Repository from './Repository';

export const GET_REPOSITORIES_OF_VIEWER = gql`
  {
    viewer {
      name
      repositories(last: 25) {
        edges {
          node {
            id
            name
            url
            viewerSubscription
          }
        }
      }
    }
  }
`;

const App = () => (
  <Query query={GET_REPOSITORIES_OF_VIEWER}>
    {({ data, loading, error }) => {
      const { viewer } = data;

      if (loading) {
        return <div data-test-id="loading">Loading ...</div>;
      }

      if (error) {
        return <div data-test-id="error">Error ...</div>;
      }

      if (!viewer) {
        return <div data-test-id="no-data">No data ...</div>;
      }

      return (
        <div>
          <div data-test-id="profile">{viewer.name}</div>
          <ul>
            {viewer.repositories.edges.map(({ node }) => (
              <li key={node.id}>
                <Repository repository={node} />
              </li>
            ))}
          </ul>
        </div>
      );
    }}
  </Query>
);

export default App;

In your test:

import React from 'react';
import ReactDOM from 'react-dom';
import { ApolloProvider } from 'react-apollo';

import { mount } from 'enzyme';
import {
  createApolloClient,
  stubQueryWith,
} from 'react-apollo-async-testing';

import App, { GET_REPOSITORIES_OF_VIEWER } from './App';

let client;
let promise;

const viewerWithRepositories = {
  viewer: {
    name: 'Robin Wieruch',
    repositories: {
      edges: [
        {
          node: {
            id: '1',
            name: 'bar',
            url: 'https://bar.com',
            viewerSubscription: 'UNSUBSCRIBED',
          },
        },
        {
          node: {
            id: '2',
            name: 'qwe',
            url: 'https://qwe.com',
            viewerSubscription: 'UNSUBSCRIBED',
          },
        },
      ],
    },
  },
};

beforeAll(() => {
  promise = stubQueryWith(
    'https://api.github.com/graphql',
    {
      query: GET_REPOSITORIES_OF_VIEWER,
    },
    viewerWithRepositories,
  );

  client = createApolloClient('https://api.github.com/graphql');
});

afterAll(() => {
  // since the fetch API is stubbed with the library
  // it has to be restored after the tests
  fetch.restore();
});

test('query result of Query component', done => {
  const wrapper = mount(
    <ApolloProvider client={client}>
      <App />
    </ApolloProvider>,
  );

  expect(wrapper.find('[data-test-id="loading"]')).toHaveLength(1);

  promise.then().then(() => {
    setImmediate(() => {
      wrapper.update();

      expect(wrapper.find('[data-test-id="profile"]')).toHaveLength(
        1,
      );
      expect(wrapper.find('[data-test-id="profile"]').text()).toEqual(
        viewerWithRepositories.viewer.name,
      );

      done();
    });
  });
});

Mutation Testing:

The desired goal is to have a spied function which is used within the Mutation component's children as a function to execute the actual mutation. Only then it is possible to make assertions for the executed mutation.

In your application:

import React from 'react';
import gql from 'graphql-tag';
import { Mutation } from 'react-apollo';

export const WATCH_REPOSITORY = gql`
  mutation($id: ID!, $viewerSubscription: SubscriptionState!) {
    updateSubscription(
      input: { state: $viewerSubscription, subscribableId: $id }
    ) {
      subscribable {
        id
        viewerSubscription
      }
    }
  }
`;

const VIEWER_SUBSCRIPTIONS = {
  SUBSCRIBED: 'SUBSCRIBED',
  UNSUBSCRIBED: 'UNSUBSCRIBED',
};

const isWatch = viewerSubscription =>
  viewerSubscription === VIEWER_SUBSCRIPTIONS.SUBSCRIBED;

const Repository = ({
  repository: { id, url, name, viewerSubscription },
}) => (
  <div>
    <a href={url}>{name}</a>

    <Mutation
      mutation={WATCH_REPOSITORY}
      variables={{
        id,
        viewerSubscription: isWatch(viewerSubscription)
          ? VIEWER_SUBSCRIPTIONS.UNSUBSCRIBED
          : VIEWER_SUBSCRIPTIONS.SUBSCRIBED,
      }}
    >
      {updateSubscription => (
        <button type="button" onClick={updateSubscription}>
          {isWatch(viewerSubscription) ? 'Unwatch' : 'Watch'}
        </button>
      )}
    </Mutation>
  </div>
);

export default Repository;

In your test:

import React from 'react';
import ReactDOM from 'react-dom';
import { ApolloProvider } from 'react-apollo';

import { mount } from 'enzyme';
import {
  createApolloClient,
  injectSpyInMutation,
} from 'react-apollo-async-testing';

import Repository, { WATCH_REPOSITORY, isWatch } from './Repository';

let client;
let sinonSpy;

beforeAll(() => {
  sinonSpy = injectSpyInMutation();

  client = createApolloClient('https://api.github.com/graphql');
});

test('interaction with mutation function from the Mutation component', () => {
  const repository = {
    id: '1',
    name: 'foo',
    url: 'https://foo.com',
    viewerSubscription: 'UNSUBSCRIBED',
  };

  const wrapper = mount(
    <ApolloProvider client={client}>
      <Repository repository={repository} />
    </ApolloProvider>,
  );

  wrapper.find('button').simulate('click');

  expect(sinonSpy.calledOnce).toEqual(true);

  const expectedObject = {
    mutation: WATCH_REPOSITORY,
    variables: {
      id: repository.id,
      viewerSubscription: 'SUBSCRIBED',
    },
  };

  expect(sinonSpy.calledWith(expectedObject)).toEqual(true);
});

Example

A simple example application which uses tested Mutation and Query components can be found in the example/ folder.

Install:

git clone [email protected]:rwieruch/react-apollo-async-testing.git
cd react-apollo-async-testing/example
npm install

Run tests:

npm test

Run application:

add your own REACT_APP_GITHUB_PERSONAL_ACCESS_TOKEN in .env file
- scopes/permissions you need to check: admin:org, repo, user, notifications
npm start
visit http://localhost:3000

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