Remove test case entirely

@ulfgebhardt when I write "Remove test case" I mean indeed removing all
the lines of code of that test case, not only disabling it. Commenting
out code *and pushing it to version control* is a strong anti-pattern. Why?
First, code comments get out of date quickly. "Never trust code comments".
Second: In our example here, it creates anxiety because other contributors might
believe there was a reason why the commented code exists.

Read:
* https://blog.codinghorror.com/coding-without-comments/
* https://www.nayuki.io/page/dont-share-commented-out-code
* https://softwareengineering.stackexchange.com/questions/1/comments-are-a-code-smell

backend/src/middleware/userMiddleware.spec.js

@@ -33,25 +33,8 @@ describe('userMiddleware', () => {
       await expect(client.request(mutation, variables))
         .resolves.toEqual(expected)
     })
-
-    // TODO rethink how and if the user can specify its id
-    // are there rules for this?
-    // For more info see: https://github.com/Human-Connection/Human-Connection/pull/478#discussion_r280530171
-    /* it('with ID, email and password', async () => {
-      const variables = {
-        password: '123',
-        id: 'u1',
-        email: '123@123.de'
-      }
-      const expected = {
-        CreateUser: {
-          id: 'u1'
-        }
-      }
-      await expect(client.request(mutation, variables))
-        .resolves.toEqual(expected)
-    }) */
   })
+
   describe('update User', () => {
     const mutation = `
       mutation($id: ID!, $name: String) {