Webxr unit tests (#5227)

* Initial version of WebXR tests, running on Chrome

* Don't run tests when navigator.xr is not available (e.g. on Firefox)

* Adjust formatting per PR feedback

Author: diarmidmackenzie

src/core/scene/a-scene.js

@@ -116,7 +116,7 @@ class AScene extends AEntity {
     this.pointerRestrictedBound = function () { self.pointerRestricted(); };
     this.pointerUnrestrictedBound = function () { self.pointerUnrestricted(); };
 
-    if (!isWebXRAvailable) {
+    if (!self.hasWebXR) {
       // Exit VR on `vrdisplaydeactivate` (e.g. taking off Rift headset).
       window.addEventListener('vrdisplaydeactivate', this.exitVRBound);
 
@@ -355,7 +355,7 @@ class AScene extends AEntity {
       }
       self.emit('enter-vr', {target: self});
       // Lock to landscape orientation on mobile.
-      if (!isWebXRAvailable && self.isMobile && screen.orientation && screen.orientation.lock) {
+      if (!self.hasWebXR && self.isMobile && screen.orientation && screen.orientation.lock) {
         screen.orientation.lock('landscape');
       }
       self.addFullScreenStyles();

tests/__init.test.js

@@ -37,9 +37,11 @@ setup(function () {
       getDevice: function () { return {requestPresent: function () {}}; },
       isPresenting: function () { return true; },
       setDevice: function () {},
+      setSession: function () { return Promise.resolve(); },
       setFoveation: function () {},
       setPoseTarget: function () {},
       dispose: function () {},
+      setReferenceSpaceType: function () {},
       enabled: false
     },
     dispose: function () {},