Wrapping component to show/hide UI based on UIFeature setting

src/components/views/settings/UiFeatureSettingWrapper.tsx

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+/*
+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 SettingsStore from '../../../settings/SettingsStore';
+import { UIFeature } from '../../../settings/UIFeature';
+
+interface Props {
+    uiFeature: UIFeature;
+    roomId?: string;
+}
+const UiFeatureSettingWrapper: React.FC<Props> = ({ children, uiFeature, roomId }) => {
+    const settingValue = SettingsStore.getValue(uiFeature, roomId);
+    return settingValue && children ? <>{ children }</> : null;
+};
+
+export default UiFeatureSettingWrapper;

test/components/views/settings/UiFeatureSettingWrapper-test.tsx

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+import React from 'react';
+import { mount } from 'enzyme';
+
+import SettingsStore from '../../../../src/settings/SettingsStore';
+import UiFeatureSettingWrapper from '../../../../src/components/views/settings/UiFeatureSettingWrapper';
+import { UIFeature } from '../../../../src/settings/UIFeature';
+
+jest.mock('../../../../src/settings/SettingsStore');
+
+describe('<UiFeatureSettingWrapper>', () => {
+    const defaultProps = {
+        uiFeature: UIFeature.Flair,
+        children: <div>test</div>,
+        roomId: 'testabc',
+    };
+    const getComponent = (props = {}) => mount(<UiFeatureSettingWrapper {...defaultProps} {...props} />);
+
+    beforeEach(() => {
+        (SettingsStore.getValue as jest.Mock).mockClear().mockReturnValue(true);
+    });
+
+    it('renders children when setting is truthy', () => {
+        const component = getComponent();
+
+        expect(component).toMatchSnapshot();
+        expect(SettingsStore.getValue).toHaveBeenCalledWith(defaultProps.uiFeature, defaultProps.roomId);
+    });
+
+    it('returns null when setting is truthy but children are undefined', () => {
+        const component = getComponent({ children: undefined });
+
+        expect(component.html()).toBeNull();
+    });
+
+    it('returns null when setting is falsy', () => {
+        (SettingsStore.getValue as jest.Mock).mockReturnValue(false);
+        const component = getComponent();
+
+        expect(component.html()).toBeNull();
+    });
+});

test/components/views/settings/__snapshots__/UiFeatureSettingWrapper-test.tsx.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`<UiFeatureSettingWrapper> renders children when setting is truthy 1`] = `
+<UiFeatureSettingWrapper
+  roomId="testabc"
+  uiFeature="UIFeature.flair"
+>
+  <div>
+    test
+  </div>
+</UiFeatureSettingWrapper>
+`;