Add telemetry for OpenTerminal (#200)

src/Common/MessageHandler.test.ts

@@ -1,6 +1,5 @@
 import Q from "q";
 import * as MessageHandler from "./MessageHandler";
-import { MessageTypes } from "../Contracts/ExplorerContracts";
 
 describe("Message Handler", () => {
   it("should handle cached message", async () => {
@@ -26,4 +25,34 @@ describe("Message Handler", () => {
     MessageHandler.runGarbageCollector();
     expect(MessageHandler.RequestMap["123"]).toBeUndefined();
   });
+
+  describe("getDataExplorerWindow", () => {
+    it("should return current window if current window has dataExplorerPlatform property", () => {
+      const currentWindow: Window = { dataExplorerPlatform: 0 } as any;
+
+      expect(MessageHandler.getDataExplorerWindow(currentWindow)).toEqual(currentWindow);
+    });
+
+    it("should return current window's parent if current window's parent has dataExplorerPlatform property", () => {
+      const parentWindow: Window = { dataExplorerPlatform: 0 } as any;
+      const currentWindow: Window = { parent: parentWindow } as any;
+
+      expect(MessageHandler.getDataExplorerWindow(currentWindow)).toEqual(parentWindow);
+    });
+
+    it("should return undefined if none of the windows in the hierarchy have dataExplorerPlatform property and window's parent is reference to itself", () => {
+      const parentWindow: Window = {} as any;
+      (parentWindow as any).parent = parentWindow; // If a window does not have a parent, its parent property is a reference to itself.
+      const currentWindow: Window = { parent: parentWindow } as any;
+
+      expect(MessageHandler.getDataExplorerWindow(currentWindow)).toBeUndefined();
+    });
+
+    it("should return undefined if none of the windows in the hierarchy have dataExplorerPlatform property and window's parent is not defined", () => {
+      const parentWindow: Window = {} as any;
+      const currentWindow: Window = { parent: parentWindow } as any;
+
+      expect(MessageHandler.getDataExplorerWindow(currentWindow)).toBeUndefined();
+    });
+  });
 });