Migrated Hosted Explorer to React (#360)

Co-authored-by: Victor Meng <vimeng@microsoft.com>
Co-authored-by: Steve Faulkner <stfaul@microsoft.com>

src/Platform/Hosted/Components/MeControl.test.tsx

@@ -0,0 +1,17 @@
+jest.mock("../../../hooks/useDirectories");
+import "@testing-library/jest-dom";
+import { fireEvent, render, screen } from "@testing-library/react";
+import React from "react";
+import { MeControl } from "./MeControl";
+import { Account } from "msal";
+
+it("renders", () => {
+  const account = {} as Account;
+  const logout = jest.fn();
+  const openPanel = jest.fn();
+
+  render(<MeControl graphToken="" account={account} logout={logout} openPanel={openPanel} />);
+  fireEvent.click(screen.getByRole("button"));
+  expect(screen.getByText("Switch Directory")).toBeDefined();
+  expect(screen.getByText("Sign Out")).toBeDefined();
+});