Display top bar in welcome screen. (#3643)

Signed-off-by: Panu Horsmalahti <phorsmalahti@mirantis.com>

src/renderer/components/+welcome/__test__/welcome.test.tsx

@@ -0,0 +1,55 @@
+/**
+ * Copyright (c) 2021 OpenLens Authors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+import React from "react";
+import { render } from "@testing-library/react";
+import "@testing-library/jest-dom/extend-expect";
+import { Welcome } from "../welcome";
+import { TopBarRegistry, WelcomeMenuRegistry } from "../../../../extensions/registries";
+
+describe("<Welcome/>", () => {
+  beforeEach(() => {
+    TopBarRegistry.createInstance();
+    WelcomeMenuRegistry.createInstance();
+  });
+
+  afterEach(() => {
+    TopBarRegistry.resetInstance();
+    WelcomeMenuRegistry.resetInstance();
+  });
+
+  it("renders items in the top bar", async () => {
+    const testId = "testId";
+    const text = "topBarItem";
+ 
+    TopBarRegistry.getInstance().getItems = jest.fn().mockImplementationOnce(() => [
+      {
+        components: {
+          Item: () => <span data-testid={testId}>{text}</span>
+        }
+      }
+    ]);
+
+    const { getByTestId } = render(<Welcome  />);
+
+    expect(await getByTestId(testId)).toHaveTextContent(text);
+  });
+});