replacing phantomjs with headless chrome

karma.conf.js

@@ -53,8 +53,13 @@ module.exports = function(config) {
     // - Safari (only Mac)
     // - PhantomJS
     // - IE (only Windows)
-    browsers: ['Chrome'],
-
+    browsers: ['HeadlessChrome'],
+    customLaunchers: {
+        HeadlessChrome:{
+          base: 'ChromeHeadless',
+          flags: ['--no-sandbox']
+        },
+    },
 
     // Continuous Integration mode
     // if true, Karma captures browsers, runs the tests and exits

package.json

@@ -22,7 +22,7 @@
     "bundle": "del-cli dist && node ./scripts/bundle.js . Ajv pure_getters",
     "bundle-beautify": "node ./scripts/bundle.js js-beautify",
     "build": "del-cli lib/dotjs/*.js '!lib/dotjs/index.js' && node scripts/compile-dots.js",
-    "test-karma": "karma start --single-run --browsers PhantomJS",
+    "test-karma": "karma start",
     "test-browser": "del-cli .browser && npm run bundle && scripts/prepare-tests && npm run test-karma",
     "test": "npm run jshint && npm run eslint && npm run test-ts && npm run build && npm run test-cov && if-node-version 8 npm run test-browser",
     "prepublish": "npm run build && npm run bundle",
@@ -82,13 +82,11 @@
     "jshint": "^2.9.4",
     "json-schema-test": "^2.0.0",
     "karma": "^3.0.0",
-    "karma-chrome-launcher": "^2.0.0",
+    "karma-chrome-launcher": "^2.2.0",
     "karma-mocha": "^1.1.1",
-    "karma-phantomjs-launcher": "^1.0.0",
     "karma-sauce-launcher": "^1.1.0",
     "mocha": "^5.1.1",
     "nyc": "^12.0.1",
-    "phantomjs-prebuilt": "^2.1.4",
     "pre-commit": "^1.1.1",
     "require-globify": "^1.3.0",
     "typescript": "^2.8.3",