Add full integration test with hubtraf

- Fully simulates what a user would be doing
- Also tests tljh-config set and reload functionality

integration-tests/test_hub.py

@@ -1,5 +1,32 @@
 import requests
+from hubtraf.user import User
+from hubtraf.auth.dummy import login_dummy
+import secrets
+import pytest
+from functools import partial
+import pwd
+
 
 def test_hub_up():
     r = requests.get('http://127.0.0.1')
     r.raise_for_status()
+
+
+@pytest.mark.asyncio
+async def test_user_code_execute():
+    """
+    User logs in, starts a server & executes code
+    """
+    # This *must* be localhost, not an IP
+    # aiohttp throws away cookies if we are connecting to an IP!
+    hub_url = 'http://localhost'
+    username = secrets.token_hex(8)
+
+    async with User(username, hub_url, partial(login_dummy, password='')) as u:
+            await u.login()
+            await u.ensure_server()
+            await u.start_kernel()
+            await u.assert_code_output("5 * 4", "20", 5, 5)
+
+            # Assert that the user exists
+            assert pwd.getpwnam(f'jupyter-{username}') is not None