Spec: add user creation test

spec/vncserver_spec.py

@@ -1,4 +1,5 @@
 import os
+import pexpect
 import shutil
 import subprocess
 from path import Path
@@ -123,3 +124,22 @@ with description('vncserver') as self:
             expect(completed_process.returncode).to(equal(0))
 
             check_de_was_setup_to_run('cinnamon')
+
+    with context('guided user creation'):
+        with fit('asks to create a user if none exist'):
+            child = pexpect.spawn(f'{vncserver_cmd} -select-de cinnamon',
+                                  timeout=2)
+            child.expect('Enter username')
+            child.sendline()
+            child.expect('Password:')
+            child.sendline('password')
+            child.expect('Verify:')
+            child.sendline('password')
+            child.expect(pexpect.EOF)
+            child.close()
+            expect(child.exitstatus).to(equal(0))
+
+            home_dir = os.environ['HOME']
+            user = os.environ['USER']
+            completed_process = run_cmd(f'grep -q {user} {home_dir}/.kasmpasswd')
+            expect(completed_process.returncode).to(equal(0))