test relay with easygraphql

[sibelius]

https://gist.github.com/estrada9166/3cc30cece4d159228439298af7b41408

// @flow
/* global __DEV__ */
import fs from'fs';
import path from'path';
import EasyGraphQLTester from 'easygraphql-tester';

import { installRelayDevTools } from 'relay-devtools';
import { Environment, Network, RecordSource, Store } from 'relay-runtime';
import RelayNetworkLogger from 'relay-runtime/lib/RelayNetworkLogger';

import cacheHandler from './cacheHandler';
import { fixtures } from './fixture'

const schema = fs.readFileSync(path.join(__dirname, '..', '..', 'data',  'schema.graphql'), 'utf8');
const tester = new EasyGraphQLTester(schema);

let networkQuery = cacheHandler
if (__DEV__) {
  installRelayDevTools();
  networkQuery = RelayNetworkLogger.wrapFetch(cacheHandler)
}

// If it is a test set this variable or process.env.NODE_ENV === 'test'
if (__TEST__) {
  networkQuery = fetchQuery
}

function fetchQuery(operation, variables) {
  const mockedQuery = tester.mock({
    query: operation.text,
    variables,
    fixture: fixtures[operation.name]
  })
  console.log('Mocked Query: --->', mockedQuery);
  return mockedQuery.json()
}

const network = Network.create(networkQuery);

const source = new RecordSource();
const store = new Store(source);

// export const inspector = new RecordSourceInspector(source);

const env = new Environment({
  network,
  store,
});

export default env;