Fix Firefox test launcher

Author: dmarcos

.travis.yml

@@ -10,7 +10,7 @@ addons:
       - google-chrome-stable
 
 node_js:
-  - '4.6'
+  - '11.6'
 
 install:
   - npm install

package.json

@@ -76,7 +76,7 @@
     "karma-chrome-launcher": "^2.0.0",
     "karma-coverage": "^1.1.1",
     "karma-env-preprocessor": "^0.1.1",
-    "karma-firefox-launcher": "^1.0.0",
+    "karma-firefox-launcher": "^1.2.0",
     "karma-mocha": "^1.1.1",
     "karma-mocha-reporter": "^2.1.0",
     "karma-sinon-chai": "1.2.4",

tests/__init.test.js

@@ -32,6 +32,7 @@ setup(function () {
   AScene.prototype.renderer = {
     vr: {
       getDevice: function () { return {requestPresent: function () {}}; },
+      isPresenting: function () { return true; },
       setDevice: function () {},
       setPoseTarget: function () {},
       enabled: false