Refactor test setup (vercel#5391)

- [x] Move jest config from npm scripts to `jest.config.js`
- [x] Remove obsolete cross-env package (we don't need it anymore 🎉)
- [x] Fix bug where tests are not waiting for webdriver to be ready.

azure-pipelines.yml

@@ -16,13 +16,13 @@ steps:
   displayName: 'Install Node.js'
 
 - script: |
-    npm install
+    yarn install
   displayName: 'Install dependencies'
 
 - script: |
-    npm run bootstrap
+    yarn bootstrap
   displayName: 'Lerna bootstrap'
 
 - script: |
-    npm test
-  displayName: 'Run tests'
+    yarn test
+  displayName: 'Run tests'

jest.config.js

@@ -0,0 +1,12 @@
+'use strict'
+
+module.exports = {
+  testMatch: ['**/*.test.js'],
+  verbose: true,
+  bail: true,
+  testEnvironment: 'node',
+  rootDir: 'test',
+  modulePaths: ['<rootDir>/lib'],
+  globalSetup: '<rootDir>/jest-global-setup.js',
+  globalTeardown: '<rootDir>/jest-global-teardown.js'
+}

package.json

@@ -8,10 +8,10 @@
     "lerna": "lerna",
     "bootstrap": "lerna bootstrap",
     "dev": "lerna run build --stream --parallel",
-    "testonly": "cross-env NODE_PATH=test/lib jest \\.test.js --config=./test/jest-config.json",
+    "testonly": "jest",
     "testall": "npm run testonly -- --coverage --forceExit --runInBand",
     "pretest": "npm run lint",
-    "test": "cross-env npm run testall || npm run testall",
+    "test": "npm run testall || npm run testall",
     "coveralls": "cat ./test/coverage/lcov.info | coveralls",
     "lint": "lerna run lint",
     "prepublish": "lerna run prepublish",
@@ -46,7 +46,6 @@
     "chromedriver": "2.42.0",
     "clone": "2.1.1",
     "coveralls": "3.0.2",
-    "cross-env": "5.2.0",
     "express": "4.16.3",
     "fkill": "5.1.0",
     "flatten": "1.0.2",
@@ -66,6 +65,7 @@
     "rimraf": "2.6.2",
     "standard": "11.0.1",
     "taskr": "1.1.0",
+    "wait-port": "0.2.2",
     "wd": "1.10.3"
   }
 }

test/jest-global-setup.js

@@ -1,5 +1,14 @@
+'use strict'
+
 const chromedriver = require('chromedriver')
+const waitPort = require('wait-port')
 
 module.exports = async function globalSetup () {
   chromedriver.start()
+
+  // https://github.com/giggio/node-chromedriver/issues/117
+  await waitPort({
+    port: 9515,
+    timeout: 1000 * 60 * 2 // 2 Minutes
+  })
 }

test/jest-global-teardown.js

@@ -1,3 +1,5 @@
+'use strict'
+
 const chromedriver = require('chromedriver')
 
 module.exports = async function globalSetup () {