Add chrome.cast.media class tests

test/spec/shim/media/VolumeRequest.spec.js

@@ -0,0 +1,20 @@
+"use strict";
+
+describe("chrome.cast.media.VolumeRequest", () => {
+    it("should have all properties", async () => {
+        const volumeRequest = new chrome.cast.media.VolumeRequest();
+
+        expect(volumeRequest.customData).toBe(null);
+        expect(volumeRequest.volume).toBe(undefined);
+    });
+
+    it("should have expected assigned properties", async () => {
+        const volume = new chrome.cast.Volume(0.5, false);
+        const volumeRequest = new chrome.cast.media.VolumeRequest(volume);
+
+        expect(volumeRequest.volume).toEqual(jasmine.objectContaining({
+            level: 0.5
+          , muted: false
+        }));
+    });
+});