snapshot of https://github.com/mattermost/mattermost.git (master, 2026-09-16; blobs > 131072B omitted)

e2e-tests/cypress/tests/integration/channels/websocket/channel_created/new_sidebar_spec.js

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+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+// ***************************************************************
+// - [#] indicates a test step (e.g. # Go to a page)
+// - [*] indicates an assertion (e.g. * Check the title)
+// - Use element ID when selecting an element. Create one if none.
+// ***************************************************************
+
+// Stage: @prod
+// Group: @channels @websocket
+
+import {getRandomId} from '@/utils';
+
+describe('Handle removed user - new sidebar', () => {
+    it('MM-27202 should add new channels to the sidebar when created from another session', () => {
+        // # Start with a new team
+        const teamName = `team-${getRandomId()}`;
+        cy.createNewTeam(teamName, teamName);
+
+        // * Verify that we've switched to the new team
+        cy.uiGetLHSHeader().findByText(teamName);
+
+        // # Create a new channel from another session
+        const channelName = `channel-${getRandomId()}`;
+        cy.apiGetTeamByName(teamName).then(({team}) => {
+            cy.apiCreateChannel(team.id, channelName, channelName, 'O', '', '', false);
+        });
+
+        // Verify that the new channel is in the sidebar
+        cy.get(`#sidebarItem_${channelName}`).should('be.visible');
+    });
+});

e2e-tests/cypress/tests/integration/channels/websocket/channel_created/old_sidebar_spec.js

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+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+// ***************************************************************
+// - [#] indicates a test step (e.g. # Go to a page)
+// - [*] indicates an assertion (e.g. * Check the title)
+// - Use element ID when selecting an element. Create one if none.
+// ***************************************************************
+
+// Stage: @prod
+// Group: @channels @websocket
+
+import {getRandomId} from '@/utils';
+
+describe('Handle removed user - new sidebar', () => {
+    it('MM-27202 should add new channels to the sidebar when created from another session', () => {
+        // # Start with a new team
+        const teamName = `team-${getRandomId()}`;
+        cy.createNewTeam(teamName, teamName);
+
+        // * Verify that we've switched to the new team
+        cy.uiGetLHSHeader().findByText(teamName);
+
+        // # Create a new channel from another session
+        const channelName = `channel-${getRandomId()}`;
+        cy.apiGetTeamByName(teamName).then(({team}) => {
+            cy.apiCreateChannel(team.id, channelName, channelName, 'O', '', '', false);
+        });
+
+        // Verify that the new channel is in the sidebar
+        cy.get(`#sidebarItem_${channelName}`).should('be.visible');
+    });
+});