Start worker using subprocess

This is because it ends up forking the tests else, which is really weird, and bad

tests/__init__.py

@@ -1,5 +1,7 @@
 import functools
 import os
+import shutil
+import subprocess
 
 from aiohttp.test_utils import unused_port
 from aiounittest import AsyncTestCase
@@ -28,10 +30,12 @@ class BaseWorkerTestCase(BaseTestCase):
     def setUp(self):
         super().setUp()
         self.unused_port = unused_port()
-        result = self.run_cli(["start", "--port", self.unused_port])
+        result = subprocess.run(
-        self.assertEqual(result.exit_code, 0, result.stdout)
+            [shutil.which("ctf"), "start", "--port", str(self.unused_port)]
+        )
+        self.assertEqual(result.returncode, 0)
 
     def tearDown(self):
-        result = self.run_cli(["stop"])
+        result = subprocess.run([shutil.which("ctf"), "stop"])
-        self.assertEqual(result.exit_code, 0, result.stdout)
+        self.assertEqual(result.returncode, 0)
         super().tearDown()