implement resolver tests stub

Author: szamanr

src/Resolver.test.js

@@ -0,0 +1,48 @@
+import Resolver from "./Resolver";
+import React from "react";
+import {unmountComponentAtNode} from "react-dom";
+import {act} from "react-dom/test-utils";
+import {render, screen} from '@testing-library/react';
+import {BrowserRouter} from "react-router-dom";
+
+const mockUrlParams = (slug) => {
+    return {
+        params: {
+            slug: slug,
+        }
+    }
+};
+
+let container = null;
+beforeEach(() => {
+    // setup a DOM element as a render target
+    container = document.createElement("div");
+    document.body.appendChild(container);
+
+    act(() => {
+        render(<Resolver match={mockUrlParams('random-slug')}/>, {
+            container: container,
+            wrapper: BrowserRouter
+        });
+    });
+});
+
+afterEach(() => {
+    // cleanup on exiting
+    unmountComponentAtNode(container);
+    container.remove();
+    container = null;
+});
+
+test('renders', () => {
+    const redirectionText = screen.getByText(/Redirecting/i);
+    expect(redirectionText).toBeInTheDocument();
+});
+
+xtest('redirects', () => {
+    // TODO
+});
+
+xtest('displays incorrect URL warning', () => {
+    // TODO
+});