replace phantomjs with headless_chrome

phantomjs doesn't support es6 (ariya/phantomjs#14506)

.circleci/config.yml

@@ -40,7 +40,7 @@ jobs:
             MOCHA_FILE: junit/test-results.xml
       - run:
           name: test-browser
-          command: npm run test-browser || true
+          command: npm run test-browser
       - run:
           name: lint
           command: npm run lint

Makefile

@@ -2,7 +2,7 @@ BROWSERIFY ?= browserify
 MINIFY ?= minify
 REPORTER ?= spec
 MOCHA ?= mocha
-MOCHA_PHANTOMJS ?= mocha-phantomjs
+MOCHA_HEADLESS_CHROME ?= node_modules/mocha-headless-chrome/bin/start
 #FILTER ?= .+
 BROWSERIFIED ?= dist/opentmi-client.js
 MINIFIED ?= dist/opentmi-client.min.js
@@ -35,7 +35,7 @@ ${BROWSER_TEST} : $(shell ${BROWSERIFY} --list ${TESTS})
 
 
 test-browser: bower-install ${BROWSER_TEST}
-	${MOCHA_PHANTOMJS} -p node_modules/phantomjs/bin/phantomjs -R ${REPORTER} -g '${FILTER}' test/index.html
+	${MOCHA_HEADLESS_CHROME} -f test/index.html
 
 test-node:
 	NODE_ENV=test ${MOCHA} --reporter $(REPORTER) --recursive -g '${FILTER}'

package.json

@@ -34,7 +34,7 @@
     "debug": "^3.1.0",
     "invariant": "^2.2.2",
     "lodash": "^4.17.4",
-    "mocha-junit-reporter": "^1.14.0",
+
     "socket.io-client": "^2.0.3"
   },
   "devDependencies": {
@@ -53,7 +53,8 @@
     "istanbul": "^0.4.3",
     "jsdoc": "^3.5.5",
     "mocha": "^4.0.1",
-    "mocha-phantomjs": "^4.1.0",
+    "mocha-headless-chrome": "^1.5.3",
+    "mocha-junit-reporter": "^1.14.0",
     "moxios": "^0.4.0",
     "sinon": "^4.0.1",
     "socket.io": "^2.0.3",