Adapt react-client to use the real backend API (#1545)

Co-authored-by: Philip Molares <philip.molares@udo.edu>
Co-authored-by: Tilman Vatteroth <git@tilmanvatteroth.de>

src/redux/note-details/reducers/build-state-from-server-permissions.test.ts

@@ -0,0 +1,31 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import { initialState } from '../initial-state'
+import type { NotePermissions } from '../../../api/notes/types'
+import { buildStateFromServerPermissions } from './build-state-from-server-permissions'
+import type { NoteDetails } from '../types/note-details'
+
+describe('build state from server permissions', () => {
+  it('creates a new state with the given permissions', () => {
+    const state: NoteDetails = { ...initialState }
+    const permissions: NotePermissions = {
+      owner: 'test-owner',
+      sharedToUsers: [
+        {
+          username: 'test-user',
+          canEdit: true
+        }
+      ],
+      sharedToGroups: [
+        {
+          groupName: 'test-group',
+          canEdit: false
+        }
+      ]
+    }
+    expect(buildStateFromServerPermissions(state, permissions)).toStrictEqual({ ...state, permissions: permissions })
+  })
+})