Implement blank file tests + fix shim

test/spec/shim/cast/SenderApplication.spec.js

@@ -0,0 +1,18 @@
+"use strict";
+
+describe("chrome.cast.SenderApplication", () => {
+    it("should have all properties", async () => {
+        const senderApplication = new chrome.cast.SenderApplication();
+
+        expect(senderApplication.platform).toBe(undefined);
+        expect(senderApplication.url).toBe(null);
+        expect(senderApplication.packageId).toBe(null);
+    });
+
+    it("should have expected assigned properties", async () => {
+        const senderApplication = new chrome.cast.SenderApplication(
+                chrome.cast.SenderPlatform.CHROME);
+
+        expect(senderApplication.platform).toBe("chrome");
+    });
+});