ENS Application

ENS Application

Installation

yarn install
yarn start

Open your browser at localhost:3000 and open metamask

Unit Testing

All tests are run with Jest for both the front-end application and testing blockchain functionality. For blockchain based tests it uses ganache-cli by default. If you want to see the transactions in the Ganache GUI, you can change the environment in the test file from GANACHE_CLI to GANACHE. Then you can open Ganache on your computer and test manually after the test runner deploys the contracts.

To run the tests:

npm test

To speed up the tests, the contracts are compiled before the tests. If you need to update the solidity code, you can run npm run compile to recompile the code. Alternatively you can uncomment the code that compiles the contracts in the tests, which will slow down the tests considerably.

Troubleshooting tests

If you get this error:

$ npm test

> [email protected] test /Users/youruser/drive/projects/ens-app
> react-scripts test --env=jsdom

2018-05-23 09:17 node[85833] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-22)
2018-05-23 09:17 node[85833] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-22)
events.js:136
      throw er; // Unhandled 'error' event
      ^

Error: Error watching file for changes: EMFILE
    at _errnoException (util.js:999:13)
    at FSEvent.FSWatcher._handle.onchange (fs.js:1374:9)
npm ERR! Test failed.  See above for more details.

Try installing watchman on OSX by doing:

brew uninstall watchman
brew install watchman

Styling

Styling in this app is done with Emotion, with styled components style CSS. We do not use css or classNames, unless we are passing through the styles to a component

Media Queries

The main way to use media queries is with the helper function mq located in the root at mediaQuery. We have absolute URL support, so you can just import it directly as mediaQuery. It has properties for all the breakpoints supported by our app. We also have a useMediaMin hook, which we plan to roll out to replace the render prop version when we can convert all our components to functional components.

Currently supported breakpoints:

const breakpoints = {
  small: 576,
  medium: 768,
  large: 992,
  xLarge: 1200
}

You can use it as follows:

import styled from '@emotion/styled'
import mq from 'mediaQuery'

const SomeComponent = styled('div')`
  font-size: 14px;
  ${mq.small`
    font-size: 22px;
  `}
`

The second way is using hooks, which uses useEffect and useState underneath. This must be used with functional components.

import { useMediaMin } from './mediaQuery'

function Component(){
  const mediumBP = useMediaMin('medium')
  return <>
    {mediumBP ? <LargeComponent /> : <SmallComponent />}
  <>
}

End to end Testing

The ENS app has end to end tests with Cypress. To run them you need to start ganache, run the seed script, run the app and then run cypress. This should start chrome and the Cypress GUI. Each time the test run, the script needs to be re-run and the app restarted for it to work.

ganache-cli

yarn run preTest

yarn start

yarn run cypress:open