Add tests for Page component

Signed-off-by: Haris Bikovic <[email protected]>

frontend/src/components/Page.test.tsx

@@ -0,0 +1,42 @@
+/*
+  This file is part of Edgehog.
+  Copyright 2023 SECO Mind Srl
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  SPDX-License-Identifier: Apache-2.0
+*/
+
+import { it, expect, vi } from "vitest";
+import { fireEvent } from "@testing-library/react";
+import { renderWithProviders } from "setupTests";
+
+import Page from "./Page";
+
+it("'try again' button does not render when no function given", () => {
+  const { queryByText } = renderWithProviders(<Page.LoadingError />);
+
+  const tryAgainButton = queryByText("Try again");
+  expect(tryAgainButton).toBeNull();
+});
+
+it("renders 'try again' button and handles click", () => {
+  const props = {
+    onRetryFunction: vi.fn(),
+  };
+  const { getByText } = renderWithProviders(
+    <Page.LoadingError onRetry={props.onRetryFunction}></Page.LoadingError>,
+  );
+
+  const retryButton = getByText("Try Again");
+  expect(retryButton).toBeInTheDocument();
+
+  fireEvent.click(retryButton);
+  expect(props.onRetryFunction).toHaveBeenCalled();
+});