improve error of node tests (#3928)

remove unused imports
and fail without revealing the token

node/test/test.js

@@ -1,33 +1,29 @@
 // @ts-check
-import DeltaChat, { Message } from '../dist'
-import binding from '../binding'
+import DeltaChat from '../dist'
 
-import { deepEqual, deepStrictEqual, strictEqual } from 'assert'
+import { deepStrictEqual, strictEqual } from 'assert'
 import chai, { expect } from 'chai'
 import chaiAsPromised from 'chai-as-promised'
 import { EventId2EventName, C } from '../dist/constants'
 import { join } from 'path'
-import { mkdtempSync, statSync } from 'fs'
-import { tmpdir } from 'os'
+import { statSync } from 'fs'
 import { Context } from '../dist/context'
+import fetch from 'node-fetch'
 chai.use(chaiAsPromised)
-chai.config.truncateThreshold = 0; // Do not truncate assertion errors.
+chai.config.truncateThreshold = 0 // Do not truncate assertion errors.
 
 async function createTempUser(url) {
-  const fetch = require('node-fetch')
-
   async function postData(url = '') {
     // Default options are marked with *
     const response = await fetch(url, {
       method: 'POST', // *GET, POST, PUT, DELETE, etc.
-      mode: 'cors', // no-cors, *cors, same-origin
-      cache: 'no-cache', // *default, no-cache, reload, force-cache, only-if-cached
-      credentials: 'same-origin', // include, *same-origin, omit
       headers: {
         'cache-control': 'no-cache',
       },
-      referrerPolicy: 'no-referrer', // no-referrer, *client
     })
+    if (!response.ok) {
+      throw new Error('request failed: ' + response.body.read())
+    }
     return response.json() // parses JSON response into native JavaScript objects
   }