diff --git a/tests/handlers/api/test_docker.py b/tests/handlers/api/test_docker.py
index 06d58026..beaab7bd 100644
--- a/tests/handlers/api/test_docker.py
+++ b/tests/handlers/api/test_docker.py
@@ -24,6 +24,7 @@ import aiohttp
 
 from tests.utils import asyncio_patch
 from unittest.mock import patch, MagicMock, PropertyMock
+from gns3server.modules.docker import Docker
 
 
 @pytest.fixture
@@ -32,6 +33,15 @@ def base_params():
     return {"name": "PC TEST 1", "image": "nginx", "start_command": "nginx-daemon", "adapters": 2, "environment": "YES=1\nNO=0"}
 
 
+@pytest.yield_fixture(autouse=True)
+def mock_connection():
+    docker = Docker.instance()
+    docker._connected = True
+    docker._connector = MagicMock()
+    yield
+    Docker._instance = None
+
+
 @pytest.fixture
 def vm(server, project, base_params):
     with asyncio_patch("gns3server.modules.docker.Docker.list_images", return_value=[{"image": "nginx"}]) as mock_list: