Error while running npm test

[programmerKaustubh]

C:\swapi-graphql-master\scripts\pretty.js:36
const out = stdout.toString().trim();
^

TypeError: Cannot read property 'toString' of null
at Object. (C:\swapi-graphql-master\scripts\pretty.js:36:20)
at Module._compile (module.js:635:30)
at Object.Module._extensions..js (module.js:646:10)
at Module.load (module.js:554:32)
at tryModuleLoad (module.js:497:12)
at Function.Module._load (module.js:489:3)
at Function.Module.runMain (module.js:676:10)
at startup (bootstrap_node.js:187:16)
at bootstrap_node.js:608:3
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! swapi-graphql@ pretty-check: node scripts/pretty.js --check
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the swapi-graphql@ pretty-check script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\kmema\AppData\Roaming\npm-cache_logs\2017-11-13T03_07_21_469Z-debug.log
npm ERR! Test failed. See above for more details.

I am learning how to use GraphQL and connect with my android Application. But I am getting an error on npm test command. Am I supposed to run this command in any specific folder. And also I another issue with creating Schema.json file for my android app for variant debug purpose

[IvanGoncharov]

@programmerKaustubh Sorry for the delay.
It should be already fixed since I replaced custom prettier.js script with eslint-pluggin-prettier.
Would be great if you try npm test on latest master and report issues if any.