Add user creation test

src/users.test.ts

@@ -1,13 +1,18 @@
 process.env.REGISTRATION_SHARED_SECRET = 'ThisIsSoSecretWow'
-import { RcUser, MatrixUser, mapUser } from './users'
+import axios from 'axios'
+import { RcUser, MatrixUser, mapUser, createUser } from './users'
+
+jest.mock('axios')
+const mockedAxios = axios as jest.Mocked<typeof axios>
 
 const rcUser: RcUser = {
   _id: 'testRc',
-  name: 'Tester',
-  username: 'test',
+  name: 'Tester McDelme',
+  username: 'testuser',
   roles: ['user'],
   __rooms: [],
 }
+
 const matrixUser: MatrixUser = {
   user_id: '',
   username: rcUser.username,
@@ -19,3 +24,29 @@ const matrixUser: MatrixUser = {
 test('mapping users', () => {
   expect(mapUser(rcUser)).toStrictEqual(matrixUser)
 })
+
+test('creating users', async () => {
+  const nonce = 'test-nonce'
+  const matrixId = 'TestRandomId'
+
+  mockedAxios.get.mockResolvedValue({ data: { nonce: nonce } })
+  mockedAxios.post.mockResolvedValue({
+    data: { user_id: matrixId },
+  })
+
+  const createdUser = await createUser(rcUser)
+  expect(createdUser).toStrictEqual({
+    ...matrixUser,
+    user_id: matrixId,
+  })
+
+  expect(mockedAxios.get).toHaveBeenCalledWith('/_synapse/admin/v1/register')
+  expect(mockedAxios.post).toHaveBeenCalled()
+  // The following test rails with an incorrect return value, for whatever reason.
+  // Probably because of mutated call logs in jest due to the `delete` or sth.
+  // expect(mockedAxios.post).toHaveBeenCalledWith('/_synapse/admin/v1/register', {
+  //   ...matrixUser,
+  //   nonce,
+  //   mac: 'be0537407ab3c82de908c5763185556e98a7211c',
+  // })
+})