[MM-60076] Convert ./components/sidebar/sidebar_channel/sidebar_base_channel/sidebar_base_channel.tsx from Class Component to Function Component (#27995)

* Change: Convert sidebar_base_channel to functional component
Change: Update sidebar_base_channel test

* Change: Add waitFor method to fix failing tests

* Add: Sidebar_base_channel_icon component
Change: Use useCallback to cache the handleLeave functions
Change: Update test snapshots

* Change: getIcon to channelIcon
Change: Add actions.leaveChannel and actions.openModal as useCallback dependencies
Change: Remove else statements

webapp/channels/src/components/sidebar/sidebar_channel/sidebar_base_channel/__snapshots__/sidebar_base_channel.test.tsx.snap

@@ -24,8 +24,9 @@ exports[`components/sidebar/sidebar_channel/sidebar_base_channel should match sn
   }
   channelLeaveHandler={[Function]}
   icon={
-    <i
+    <SidebarBaseChannelIcon
-      className="icon icon-globe"
+      channelType="O"
+      isSharedChannel={false}
     />
   }
   label="channel_display_name"
@@ -57,8 +58,9 @@ exports[`components/sidebar/sidebar_channel/sidebar_base_channel should match sn
   }
   channelLeaveHandler={[Function]}
   icon={
-    <i
+    <SidebarBaseChannelIcon
-      className="icon icon-lock-outline"
+      channelType="P"
+      isSharedChannel={false}
     />
   }
   label="channel_display_name"
@@ -91,10 +93,9 @@ exports[`components/sidebar/sidebar_channel/sidebar_base_channel should match sn
   }
   channelLeaveHandler={[Function]}
   icon={
-    <SharedChannelIndicator
+    <SidebarBaseChannelIcon
       channelType="O"
-      className="icon"
+      isSharedChannel={true}
-      withTooltip={true}
     />
   }
   label="channel_display_name"
@@ -127,10 +128,9 @@ exports[`components/sidebar/sidebar_channel/sidebar_base_channel should match sn
   }
   channelLeaveHandler={[Function]}
   icon={
-    <SharedChannelIndicator
+    <SidebarBaseChannelIcon
       channelType="P"
-      className="icon"
+      isSharedChannel={true}
-      withTooltip={true}
     />
   }
   label="channel_display_name"

webapp/channels/src/components/sidebar/sidebar_channel/sidebar_base_channel/sidebar_base_channel.test.tsx

@@ -1,6 +1,7 @@
 // Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
 // See LICENSE.txt for license information.
 
+import {screen, waitFor} from '@testing-library/react';
 import {shallow} from 'enzyme';
 import React from 'react';
 
@@ -8,6 +9,8 @@ import type {ChannelType} from '@mattermost/types/channels';
 
 import SidebarBaseChannel from 'components/sidebar/sidebar_channel/sidebar_base_channel/sidebar_base_channel';
 
+import {renderWithContext, userEvent} from 'tests/react_testing_utils';
+
 describe('components/sidebar/sidebar_channel/sidebar_base_channel', () => {
     const baseProps = {
         channel: {
@@ -91,25 +94,64 @@ describe('components/sidebar/sidebar_channel/sidebar_base_channel', () => {
         expect(wrapper).toMatchSnapshot();
     });
 
-    test('expect callback to be called when leave public channel ', () => {
+    test('expect leaveChannel to be called when leave public channel ', async () => {
-        const callback = jest.fn();
+        const mockfn = jest.fn();
-        const wrapper = shallow<SidebarBaseChannel>(<SidebarBaseChannel {...baseProps}/>);
+
-        wrapper.instance().handleLeavePublicChannel(callback);
+        const props = {
-        expect(callback).toBeCalled();
+            ...baseProps,
+            channel: {
+                ...baseProps.channel,
+                type: 'O' as ChannelType,
+                shared: true,
+                name: 'l',
+            },
+            actions: {
+                leaveChannel: mockfn,
+                openModal: jest.fn(),
+            },
+        };
+
+        renderWithContext(<SidebarBaseChannel {...props}/>);
+
+        const optionsBtn = screen.getByRole('button');
+        expect(optionsBtn.classList).toContain('SidebarMenu_menuButton');
+
+        await userEvent.click(optionsBtn); // open options
+        const leaveOption: HTMLElement = screen.getByText('Leave Channel').parentElement!;
+
+        await userEvent.click(leaveOption);
+        await waitFor(() => {
+            expect(mockfn).toHaveBeenCalledTimes(1);
+        });
     });
 
-    test('expect callback to be called when leave private channel ', () => {
+    test('expect openModal to be called when leave private channel ', async () => {
-        const callback = jest.fn();
+        const mockfn = jest.fn();
+
         const props = {
             ...baseProps,
             channel: {
                 ...baseProps.channel,
                 type: 'P' as ChannelType,
+                name: 'l',
+            },
+            actions: {
+                leaveChannel: jest.fn(),
+                openModal: mockfn,
             },
         };
 
-        const wrapper = shallow<SidebarBaseChannel>(<SidebarBaseChannel {...props}/>);
+        renderWithContext(<SidebarBaseChannel {...props}/>);
-        wrapper.instance().handleLeavePrivateChannel(callback);
+
-        expect(callback).toBeCalled();
+        const optionsBtn = screen.getByRole('button');
+        expect(optionsBtn.classList).toContain('SidebarMenu_menuButton');
+
+        await userEvent.click(optionsBtn); // open options
+        const leaveOption: HTMLElement = screen.getByText('Leave Channel').parentElement!;
+
+        await userEvent.click(leaveOption);
+        await waitFor(() => {
+            expect(mockfn).toHaveBeenCalledTimes(1);
+        });
     });
 });

webapp/channels/src/components/sidebar/sidebar_channel/sidebar_base_channel/sidebar_base_channel.tsx

@@ -1,18 +1,19 @@
 // Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
 // See LICENSE.txt for license information.
 
-import React from 'react';
+import React, {useCallback} from 'react';
+import {useIntl} from 'react-intl';
 
 import type {Channel} from '@mattermost/types/channels';
 
 import {trackEvent} from 'actions/telemetry_actions';
 
 import LeaveChannelModal from 'components/leave_channel_modal';
-import SharedChannelIndicator from 'components/shared_channel_indicator';
 import SidebarChannelLink from 'components/sidebar/sidebar_channel/sidebar_channel_link';
 
 import Constants, {ModalIdentifiers} from 'utils/constants';
-import {localizeMessage} from 'utils/utils';
+
+import SidebarBaseChannelIcon from './sidebar_base_channel_icon';
 
 import type {PropsFromRedux} from './index';
 
@@ -21,63 +22,44 @@ export interface Props extends PropsFromRedux {
     currentTeamName: string;
 }
 
-export default class SidebarBaseChannel extends React.PureComponent<Props> {
+const SidebarBaseChannel = ({
-    handleLeavePublicChannel = (callback: () => void) => {
+    channel,
-        this.props.actions.leaveChannel(this.props.channel.id);
+    currentTeamName,
+    actions,
+}: Props) => {
+    const intl = useIntl();
+
+    const handleLeavePublicChannel = useCallback((callback: () => void) => {
+        actions.leaveChannel(channel.id);
         trackEvent('ui', 'ui_public_channel_x_button_clicked');
         callback();
-    };
+    }, [channel.id, actions.leaveChannel]);
 
-    handleLeavePrivateChannel = (callback: () => void) => {
+    const handleLeavePrivateChannel = useCallback((callback: () => void) => {
-        this.props.actions.openModal({modalId: ModalIdentifiers.LEAVE_PRIVATE_CHANNEL_MODAL, dialogType: LeaveChannelModal, dialogProps: {channel: this.props.channel}});
+        actions.openModal({modalId: ModalIdentifiers.LEAVE_PRIVATE_CHANNEL_MODAL, dialogType: LeaveChannelModal, dialogProps: {channel}});
         trackEvent('ui', 'ui_private_channel_x_button_clicked');
         callback();
-    };
+    }, [channel, actions.openModal]);
-
-    getChannelLeaveHandler = () => {
-        const {channel} = this.props;
 
+    let channelLeaveHandler = null;
     if (channel.type === Constants.OPEN_CHANNEL && channel.name !== Constants.DEFAULT_CHANNEL) {
-            return this.handleLeavePublicChannel;
+        channelLeaveHandler = handleLeavePublicChannel;
     } else if (channel.type === Constants.PRIVATE_CHANNEL) {
-            return this.handleLeavePrivateChannel;
+        channelLeaveHandler = handleLeavePrivateChannel;
     }
 
-        return null;
+    const channelIcon = (
-    };
+        <SidebarBaseChannelIcon
-
+            isSharedChannel={Boolean(channel.shared)}
-    getIcon = () => {
-        const {channel} = this.props;
-
-        if (channel.shared) {
-            return (
-                <SharedChannelIndicator
-                    className='icon'
             channelType={channel.type}
-                    withTooltip={true}
         />
     );
-        } else if (channel.type === Constants.OPEN_CHANNEL) {
-            return (
-                <i className='icon icon-globe'/>
-            );
-        } else if (channel.type === Constants.PRIVATE_CHANNEL) {
-            return (
-                <i className='icon icon-lock-outline'/>
-            );
-        }
-
-        return null;
-    };
-
-    render() {
-        const {channel, currentTeamName} = this.props;
 
     let ariaLabelPrefix;
     if (channel.type === Constants.OPEN_CHANNEL) {
-            ariaLabelPrefix = localizeMessage('accessibility.sidebar.types.public', 'public channel');
+        ariaLabelPrefix = intl.formatMessage({id: 'accessibility.sidebar.types.public', defaultMessage: 'public channel'});
     } else if (channel.type === Constants.PRIVATE_CHANNEL) {
-            ariaLabelPrefix = localizeMessage('accessibility.sidebar.types.private', 'private channel');
+        ariaLabelPrefix = intl.formatMessage({id: 'accessibility.sidebar.types.private', defaultMessage: 'private channel'});
     }
 
     return (
@@ -86,9 +68,10 @@ export default class SidebarBaseChannel extends React.PureComponent<Props> {
             link={`/${currentTeamName}/channels/${channel.name}`}
             label={channel.display_name}
             ariaLabelPrefix={ariaLabelPrefix}
-                channelLeaveHandler={this.getChannelLeaveHandler()!}
+            channelLeaveHandler={channelLeaveHandler!}
-                icon={this.getIcon()!}
+            icon={channelIcon}
         />
     );
-    }
+};
-}
+
+export default SidebarBaseChannel;

webapp/channels/src/components/sidebar/sidebar_channel/sidebar_base_channel/sidebar_base_channel_icon.tsx

@@ -0,0 +1,43 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import React from 'react';
+
+import type {ChannelType} from '@mattermost/types/channels';
+
+import SharedChannelIndicator from 'components/shared_channel_indicator';
+
+import Constants from 'utils/constants';
+
+type Props = {
+    isSharedChannel: boolean;
+    channelType: ChannelType;
+}
+
+const SidebarBaseChannelIcon = ({
+    isSharedChannel,
+    channelType,
+}: Props) => {
+    if (isSharedChannel) {
+        return (
+            <SharedChannelIndicator
+                className='icon'
+                channelType={channelType}
+                withTooltip={true}
+            />
+        );
+    }
+    if (channelType === Constants.OPEN_CHANNEL) {
+        return (
+            <i className='icon icon-globe'/>
+        );
+    }
+    if (channelType === Constants.PRIVATE_CHANNEL) {
+        return (
+            <i className='icon icon-lock-outline'/>
+        );
+    }
+    return null;
+};
+
+export default SidebarBaseChannelIcon;