fix tests on travis by stubbing renderer

tests/browser/__init.test.js

@@ -0,0 +1,35 @@
+/**
+ * __init.test.js is run before every test case.
+ */
+window.debug = true;
+const AScene = require('aframe').AScene;
+
+navigator.getVRDisplays = function () {
+  var resolvePromise = Promise.resolve();
+  var mockVRDisplay = {
+    requestPresent: resolvePromise,
+    exitPresent: resolvePromise,
+    getPose: function () { return { orientation: null, position: null }; },
+    requestAnimationFrame: function () { return 1; }
+  };
+  return Promise.resolve([mockVRDisplay]);
+};
+
+setup(function () {
+  this.sinon = sinon.sandbox.create();
+  // Stubs to not create a WebGL context since Travis CI runs headless.
+  this.sinon.stub(AScene.prototype, 'render');
+  this.sinon.stub(AScene.prototype, 'resize');
+  this.sinon.stub(AScene.prototype, 'setupRenderer');
+});
+
+teardown(function () {
+  // Clean up any attached elements.
+  var attachedEls = ['a-scene'];
+  var els = document.querySelectorAll(attachedEls.join(','));
+  for (var i = 0; i < els.length; i++) {
+    els[i].parentNode.removeChild(els[i]);
+  }
+  this.sinon.restore();
+  delete AFRAME.components.test;
+});

tests/browser/index.test.js

@@ -1,18 +1,12 @@
-import 'aframe';
 import React from 'react';
 import ReactDOM from 'react-dom';
 import {Entity, Scene} from '../../src/index.js';
 
 const div = document.createElement('div');
 document.body.appendChild(div);
 
-setup(function () {
-  this.sinon = sinon.sandbox.create();
-});
-
 teardown(function () {
   while (div.firstChild) { div.removeChild(div.firstChild); }
-  this.sinon.restore();
 });
 
 suite('aframe-react', () => {

tests/browser/karma.conf.js

@@ -13,8 +13,8 @@ module.exports = function (config) {
     ],
     frameworks: ['mocha', 'sinon-chai', 'chai-shallow-deep-equal'],
     preprocessors: {
-      'src/**/*.js': ['webpack'],
-      'browser/**/*.js': ['webpack']
+      'src/**/*.js': ['webpack', 'sourcemap'],
+      'browser/**/*.js': ['webpack', 'sourcemap']
     },
     reporters: ['mocha'],
     webpack: {