Live location sharing: maximised view sidebar container (#8360)

* add h4

Signed-off-by: Kerry Archibald <kerrya@element.io>

* add mixin to clear list style

Signed-off-by: Kerry Archibald <kerrya@element.io>

* add basic sidebar container

Signed-off-by: Kerry Archibald <kerrya@element.io>

* open list view button on beaconviewdialog

Signed-off-by: Kerry Archibald <kerrya@element.io>

* update tests for new utils

Signed-off-by: Kerry Archibald <kerrya@element.io>

test/components/views/beacon/DialogSidebar-test.tsx

@@ -0,0 +1,47 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+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.
+*/
+
+import React from 'react';
+import { mount } from 'enzyme';
+import { act } from 'react-dom/test-utils';
+
+import DialogSidebar from '../../../../src/components/views/beacon/DialogSidebar';
+import { findByTestId } from '../../../test-utils';
+
+describe('<DialogSidebar />', () => {
+    const defaultProps = {
+        beacons: [],
+        requestClose: jest.fn(),
+    };
+    const getComponent = (props = {}) =>
+        mount(<DialogSidebar {...defaultProps} {...props} />);
+
+    it('renders sidebar correctly', () => {
+        const component = getComponent();
+        expect(component).toMatchSnapshot();
+    });
+
+    it('closes on close button click', () => {
+        const requestClose = jest.fn();
+        const component = getComponent({ requestClose });
+
+        act(() => {
+            findByTestId(component, 'dialog-sidebar-close').at(0).simulate('click');
+        });
+
+        expect(requestClose).toHaveBeenCalled();
+    });
+});