[web] Add offline indicator to toolbar (#35368)

GitOrigin-RevId: 81127bff21afb6aadcf175ba1767a2629f01d747

services/web/test/frontend/features/ide-react/components/toolbar/offline-indicator.spec.tsx

@@ -0,0 +1,83 @@
+import OfflineIndicator from '@/features/ide-react/components/toolbar/offline-indicator'
+import { UnsavedDocsContext } from '@/features/ide-react/context/unsaved-docs-context'
+import { IdeReactContext } from '@/features/ide-react/context/ide-react-context'
+import { IdeEventEmitter } from '@/features/ide-react/create-ide-event-emitter'
+import { SplitTestProvider } from '@/shared/context/split-test-context'
+
+const defaultIdeReactContextValue = {
+  projectId: 'test-project',
+  eventEmitter: new IdeEventEmitter(),
+  startedFreeTrial: false,
+  setStartedFreeTrial: () => {},
+  reportError: () => {},
+  projectJoined: true,
+  permissionsLevel: 'owner' as const,
+  setPermissionsLevel: () => {},
+  outOfSync: false,
+  setOutOfSync: () => {},
+}
+
+const defaultUnsavedDocsContextValue = {
+  unsavedDocs: new Map<string, number>(),
+  isLocked: false,
+}
+
+const mount = ({
+  unsavedDocs = new Map<string, number>(),
+}: {
+  unsavedDocs?: Map<string, number>
+} = {}) => {
+  cy.mount(
+    <SplitTestProvider>
+      <IdeReactContext.Provider value={defaultIdeReactContextValue}>
+        <UnsavedDocsContext.Provider
+          value={{ ...defaultUnsavedDocsContextValue, unsavedDocs }}
+        >
+          <OfflineIndicator />
+        </UnsavedDocsContext.Provider>
+      </IdeReactContext.Provider>
+    </SplitTestProvider>
+  )
+}
+
+const enableFlag = () => {
+  cy.window().then(win => {
+    win.metaAttributesCache.set('ol-splitTestVariants', {
+      'intermittent-connection-improvements': 'enabled',
+    })
+  })
+}
+
+const unsavedDoc = () => new Map<string, number>([['doc-1', 20]])
+
+describe('<OfflineIndicator />', function () {
+  it('is hidden when the feature flag is disabled', function () {
+    mount({ unsavedDocs: unsavedDoc() })
+    cy.findByText('You’re offline').should('not.exist')
+    cy.findByRole('status').should('not.exist')
+  })
+
+  it('is hidden when the flag is enabled but there are no unsaved docs', function () {
+    enableFlag()
+    mount()
+    cy.findByText('You’re offline').should('not.exist')
+    cy.findByRole('status').should('be.empty')
+  })
+
+  it('is shown when the flag is enabled and there are unsaved docs', function () {
+    enableFlag()
+    mount({ unsavedDocs: unsavedDoc() })
+    cy.findAllByText('You’re offline').first().should('be.visible')
+  })
+
+  it('announces the offline status to screen readers via a live region', function () {
+    enableFlag()
+    mount({ unsavedDocs: unsavedDoc() })
+    cy.findByRole('status').within(() => {
+      cy.findByText('You’re offline').should('exist')
+      cy.findByText(
+        'Your changes are saved in the browser. We’ll sync your work when you’re back online.'
+      ).should('exist')
+    })
+  })
+})