check non-existent cloud storage update page

tests/cypress/e2e/features/cloudstorages.js

@@ -0,0 +1,29 @@
+// Copyright (C) 2023-2024 CVAT.ai Corporation
+//
+// SPDX-License-Identifier: MIT
+
+/// <reference types="cypress" />
+
+context('Cloudstorages', () => {
+    before(() => {
+        cy.visit('auth/login');
+        cy.login();
+        cy.visit('/cloudstorages');
+    });
+
+    const nonExistCloudstorageId = 99;
+
+    describe('Cloudstorage page', () => {
+        it('Verify that attempting to update a non-existent cloud storage displays an error message', () => {
+            cy.intercept({
+                method: 'GET',
+                url: `/api/cloudstorages/${nonExistCloudstorageId}`,
+            }).as('cloudstorageRequest');
+
+            cy.visit(`/cloudstorages/update/${nonExistCloudstorageId}`);
+            cy.wait('@cloudstorageRequest').its('response.statusCode').should('eq', 404);
+            cy.get('.cvat-spinner').should('not.exist');
+            cy.contains('Sorry, but the requested cloud storage was not found');
+        });
+    });
+});