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Nock

Nock is used for testing and mocking http requests in Node. Integrating graphql-mocks with Nock is easy with @graphql-mocks/network-nock.

Installation​

Install the nock and @graphql-mocks/network-nock npm packages.

# npm
npm install --save-dev nock @graphql-mocks/network-nock

# yarn
yarn add --dev nock @graphql-mocks/network-nock

Usage​

In any Nock POST .reply(), use the nockHandler with a GraphQLHandler instance.

import { GraphQLHandler } from 'graphql-mocks';
import graphqlSchema from './graphqlSchema';
import { nockHandler } from '@graphql-mocks/network-nock';
import nock from 'nock';

const graphqlHandler = new GraphQLHandler({
  dependencies: { graphqlSchema }
};

nock('http://graphql-api.com')
  .post('/graphql')
  .reply(nockHandler(graphqlHandler));

The nockHandler function also accepts an options argument, an object with checkGraphQLResult and checkRequest callbacks:

nockHandler(graphqlHandler, {
  checkRequest(request, requestBody) => void,
  checkGraphQLResult: (result) => void
})

These callbacks are useful for doing checks or additional assertions during testing

  • checkRequest callback is passed the incoming request and the requestBody
  • checkGraphQLResult callback is passed the result from the GraphQLHandler

With the above nock handler setup, a node-fetch call will be intercepted by and responded to from nock and graphql-mocks.

import fetch from 'node-fetch';

fetch('http://localhost:8080/graphql, {
  method: 'POST',
  body: JSON.stringify({
    // required
    query: `
      query {
        # graphql query
      }
    `,

    // optional
    variables: {},

    // optional
    operationName: 'OperationName'
  }),
}).then(async (response) => {
  // get the final json payload
  const result = await response.json();
  return result;
})

See the GraphQL docs for details on these body parameters, and making http requests.

Resolver Context​

The Nock request object is made available within the resolver context under the nock property:

function resolver(parent, args, context, info) {
  const { nock } = context;

  // reference to the Nock request object
  nock.request;
}

API Documentation​

See the API Documentation for types and more details.