Fix race condition

jest-puppeteer.config.js

@@ -1,10 +1,16 @@
+const port = process.env.TEST_SERVER_PORT
+  ? Number(process.env.TEST_SERVER_PORT)
+  : 4444
+
+process.env.TEST_SERVER_PORT = port
+
 module.exports = {
   launch: {
     headless: process.env.CI === 'true',
   },
   server: {
-    command: 'node server',
-    port: 4444,
+    command: `PORT=${port} node server`,
+    port,
     launchTimeout: 4000,
   },
 }

packages/expect-puppeteer/src/index.test.js

@@ -2,7 +2,7 @@ const { getDefaultOptions, setDefaultOptions } = require('.')
 
 describe('expect-puppeteer', () => {
   beforeEach(async () => {
-    await page.goto('http://localhost:4444')
+    await page.goto(`http://localhost:${process.env.TEST_SERVER_PORT}`)
   })
 
   it('should work with original Jest matchers', async () => {

packages/expect-puppeteer/src/matchers/notToMatch.test.js

@@ -1,6 +1,6 @@
 describe('not.toMatch', () => {
   beforeEach(async () => {
-    await page.goto('http://localhost:4444')
+    await page.goto(`http://localhost:${process.env.TEST_SERVER_PORT}`)
   })
 
   describe('Page', () => {

packages/expect-puppeteer/src/matchers/notToMatchElement.test.js

@@ -1,6 +1,6 @@
 describe('not.toMatchElement', () => {
   beforeEach(async () => {
-    await page.goto('http://localhost:4444')
+    await page.goto(`http://localhost:${process.env.TEST_SERVER_PORT}`)
   })
 
   describe('Page', () => {

packages/expect-puppeteer/src/matchers/toClick.test.js

@@ -1,6 +1,6 @@
 describe('toClick', () => {
   beforeEach(async () => {
-    await page.goto('http://localhost:4444')
+    await page.goto(`http://localhost:${process.env.TEST_SERVER_PORT}`)
   })
 
   describe('Page', () => {

packages/expect-puppeteer/src/matchers/toDisplayDialog.test.js

@@ -1,6 +1,6 @@
 describe('toDisplayDialog', () => {
   beforeEach(async () => {
-    await page.goto('http://localhost:4444')
+    await page.goto(`http://localhost:${process.env.TEST_SERVER_PORT}`)
   })
 
   it('should handle dialog', async () => {

packages/expect-puppeteer/src/matchers/toFill.test.js

@@ -1,6 +1,6 @@
 describe('toFill', () => {
   beforeEach(async () => {
-    await page.goto('http://localhost:4444')
+    await page.goto(`http://localhost:${process.env.TEST_SERVER_PORT}`)
   })
 
   describe('Page', () => {

packages/expect-puppeteer/src/matchers/toFillForm.test.js

@@ -1,6 +1,6 @@
 describe('toFillForm', () => {
   beforeEach(async () => {
-    await page.goto('http://localhost:4444')
+    await page.goto(`http://localhost:${process.env.TEST_SERVER_PORT}`)
   })
 
   describe('Page', () => {

packages/expect-puppeteer/src/matchers/toMatch.test.js

@@ -1,6 +1,6 @@
 describe('toMatch', () => {
   beforeEach(async () => {
-    await page.goto('http://localhost:4444')
+    await page.goto(`http://localhost:${process.env.TEST_SERVER_PORT}`)
   })
 
   describe('Page', () => {

packages/expect-puppeteer/src/matchers/toMatchElement.test.js

@@ -1,6 +1,6 @@
 describe('toMatchElement', () => {
   beforeEach(async () => {
-    await page.goto('http://localhost:4444')
+    await page.goto(`http://localhost:${process.env.TEST_SERVER_PORT}`)
   })
 
   describe('Page', () => {

packages/expect-puppeteer/src/matchers/toSelect.test.js

@@ -1,6 +1,6 @@
 describe('toSelect', () => {
   beforeEach(async () => {
-    await page.goto('http://localhost:4444')
+    await page.goto(`http://localhost:${process.env.TEST_SERVER_PORT}`)
   })
 
   describe('Page', () => {

packages/expect-puppeteer/src/matchers/toUploadFile.test.js

@@ -2,7 +2,7 @@ import path from 'path'
 
 describe('toUploadFile', () => {
   beforeEach(async () => {
-    await page.goto('http://localhost:4444')
+    await page.goto(`http://localhost:${process.env.TEST_SERVER_PORT}`)
   })
 
   describe('Page', () => {

packages/jest-environment-puppeteer/package.json

@@ -27,8 +27,6 @@
     "chalk": "^2.4.1",
     "cwd": "^0.10.0",
     "jest-dev-server": "^3.3.0",
-    "lodash": "^4.17.11",
-    "mkdirp": "^0.5.1",
-    "rimraf": "^2.6.2"
+    "lodash": "^4.17.11"
   }
 }

packages/jest-environment-puppeteer/src/PuppeteerEnvironment.js

@@ -1,10 +1,8 @@
-import fs from 'fs'
 // eslint-disable-next-line
 import NodeEnvironment from 'jest-environment-node'
 import puppeteer from 'puppeteer'
 import chalk from 'chalk'
 import readConfig from './readConfig'
-import { WS_ENDPOINT_PATH } from './constants'
 
 const handleError = error => {
   process.emit('uncaughtException', error)
@@ -32,7 +30,7 @@ class PuppeteerEnvironment extends NodeEnvironment {
     const config = await readConfig()
     this.global.puppeteerConfig = config
 
-    const wsEndpoint = fs.readFileSync(WS_ENDPOINT_PATH, 'utf8')
+    const wsEndpoint = process.env.PUPPETEER_WS_ENDPOINT
     if (!wsEndpoint) {
       throw new Error('wsEndpoint not found')
     }

packages/jest-environment-puppeteer/src/global.js

@@ -1,17 +1,13 @@
 /* eslint-disable no-console */
-import fs from 'fs'
 import {
   setup as setupServer,
   teardown as teardownServer,
   ERROR_TIMEOUT,
   ERROR_NO_COMMAND,
 } from 'jest-dev-server'
-import mkdirp from 'mkdirp'
-import rimraf from 'rimraf'
 import puppeteer from 'puppeteer'
 import chalk from 'chalk'
 import readConfig from './readConfig'
-import { DIR, WS_ENDPOINT_PATH } from './constants'
 
 let browser
 
@@ -22,8 +18,7 @@ export async function setup() {
   } else {
     browser = await puppeteer.launch(config.launch)
   }
-  mkdirp.sync(DIR)
-  fs.writeFileSync(WS_ENDPOINT_PATH, browser.wsEndpoint())
+  process.env.PUPPETEER_WS_ENDPOINT = browser.wsEndpoint()
 
   if (config.server) {
     try {
@@ -57,5 +52,4 @@ export async function setup() {
 export async function teardown() {
   await teardownServer()
   await browser.close()
-  rimraf.sync(DIR)
 }

packages/jest-environment-puppeteer/tests/basic.test.js

@@ -1,6 +1,6 @@
 describe('Basic', () => {
   beforeAll(async () => {
-    await page.goto('http://localhost:4444')
+    await page.goto(`http://localhost:${process.env.TEST_SERVER_PORT}`)
   })
 
   it('should display "This is home!" text on page', async () => {

server/index.js

@@ -5,4 +5,4 @@ const app = express()
 
 app.use(express.static(path.join(__dirname, 'public')))
 
-app.listen(4444)
+app.listen(process.env.PORT)