Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

webapp/channels/src/tests/react_testing_utils.tsx

@@ -0,0 +1,27 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import React from 'react';
+import {render} from '@testing-library/react';
+import {Provider} from 'react-redux';
+
+import {IntlProvider} from 'react-intl';
+
+import mockStore from 'tests/test_store';
+import {GlobalState} from '@mattermost/types/store';
+import {DeepPartial} from '@mattermost/types/utilities';
+
+export const renderWithIntl = (component: React.ReactNode | React.ReactNodeArray, locale = 'en') => {
+    return render(<IntlProvider locale={locale}>{component}</IntlProvider>);
+};
+
+export const renderWithIntlAndStore = (component: React.ReactNode | React.ReactNodeArray, initialState: DeepPartial<GlobalState>, locale = 'en') => {
+    const store = mockStore(initialState);
+    return render(
+        <IntlProvider locale={locale}>
+            <Provider store={store}>
+                {component}
+            </Provider>
+        </IntlProvider>,
+    );
+};