Add env variable PUPPETEER_OPEN_CHROME to decide whether to open chrome in test or not

.env

@@ -1,3 +1,4 @@
 
 PUPPETEER_HOST = http://127.0.0.1:8080
 PUPPETEER_PORT = 8080
+PUPPETEER_OPEN_CHROME = false

.env.example

@@ -1,3 +1,4 @@
 
 PUPPETEER_HOST = http://127.0.0.1:8080
 PUPPETEER_PORT = 8080
+PUPPETEER_OPEN_CHROME = true

.gitignore

@@ -39,3 +39,4 @@ npm-debug.log*
 
 src/app/architect/
 src/environments/environment.e2e.ts
+.env

jest-puppeteer.config.js

@@ -2,16 +2,17 @@
 require('dotenv').config()
 
 const port = process.env.PUPPETEER_PORT
+const host = process.env.PUPPETEER_HOST
+const openChrome = process.env.PUPPETEER_OPEN_CHROME
 
 module.exports = {
   server: {
-    command: `http-server --port ${port} ./www`,
+    command: `http-server -a 127.0.0.1 --port ${port} ./www`,
     port: port,
     launchTimeout: 5000
   },
-  
   launch: {
     dumpio: true,
-    headless: false,
+    headless: openChrome != 'true',
   },
 }