Fix incorrect usage of TelemetryProcessor (#221)

* Fix incorrect usage of TelemetryProcessor

* Address feedback

src/Utils/WindowUtils.test.ts

@@ -0,0 +1,49 @@
+import { getDataExplorerWindow } from "./WindowUtils";
+
+const createWindow = (dataExplorerPlatform: unknown, parent: Window): Window => {
+  // TODO: Need to `any` here since we're creating a mock window object
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const mockWindow: any = {};
+  if (dataExplorerPlatform !== undefined) {
+    mockWindow.dataExplorerPlatform = dataExplorerPlatform;
+  }
+  if (parent) {
+    mockWindow.parent = parent;
+  }
+  return mockWindow;
+};
+
+describe("WindowUtils", () => {
+  describe("getDataExplorerWindow", () => {
+    it("should return current window if current window has dataExplorerPlatform property", () => {
+      const currentWindow = createWindow(0, undefined);
+
+      expect(getDataExplorerWindow(currentWindow)).toEqual(currentWindow);
+    });
+
+    it("should return current window's parent if current window's parent has dataExplorerPlatform property", () => {
+      const parentWindow = createWindow(0, undefined);
+      const currentWindow = createWindow(undefined, parentWindow);
+
+      expect(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 = createWindow(undefined, undefined);
+
+      // TODO: Need to `any` here since parent is a readonly property
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      (parentWindow as any).parent = parentWindow; // If a window does not have a parent, its parent property is a reference to itself.
+      const currentWindow = createWindow(undefined, parentWindow);
+
+      expect(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 = createWindow(undefined, undefined);
+      const currentWindow = createWindow(undefined, parentWindow);
+
+      expect(getDataExplorerWindow(currentWindow)).toBeUndefined();
+    });
+  });
+});