diff --git a/gns3server/modules/virtualbox/virtualbox_vm.py b/gns3server/modules/virtualbox/virtualbox_vm.py
index 924dbfb2..49ad1cc2 100644
--- a/gns3server/modules/virtualbox/virtualbox_vm.py
+++ b/gns3server/modules/virtualbox/virtualbox_vm.py
@@ -500,7 +500,7 @@ class VirtualBoxVM(BaseVM):
 
         self._adapter_start_index = adapter_start_index
         # TODO: get rid of adapter start index
-        #self.adapters = self.adapters  # this forces to recreate the adapter list with the correct index
+        # self.adapters = self.adapters  # this forces to recreate the adapter list with the correct index
         log.info("VirtualBox VM '{name}' [{id}]: adapter start index changed to {index}".format(name=self.name,
                                                                                                 id=self.id,
                                                                                                 index=adapter_start_index))
diff --git a/tests/modules/test_project.py b/tests/modules/test_project.py
index f1d5775f..b2ce3466 100644
--- a/tests/modules/test_project.py
+++ b/tests/modules/test_project.py
@@ -24,6 +24,7 @@ import shutil
 from uuid import uuid4
 from unittest.mock import patch
 
+from tests.utils import asyncio_patch
 from gns3server.modules.project import Project
 from gns3server.modules.vpcs import VPCS, VPCSVM
 
@@ -183,7 +184,7 @@ def test_project_close(loop, manager):
     project = Project()
     vm = VPCSVM("test", "00010203-0405-0607-0809-0a0b0c0d0e0f", project, manager)
     project.add_vm(vm)
-    with patch("gns3server.modules.vpcs.vpcs_vm.VPCSVM.close") as mock:
+    with asyncio_patch("gns3server.modules.vpcs.vpcs_vm.VPCSVM.close") as mock:
         loop.run_until_complete(asyncio.async(project.close()))
         assert mock.called
 
diff --git a/tests/utils.py b/tests/utils.py
index bc8dc5dc..b8994f66 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -48,7 +48,10 @@ class _asyncio_patch:
 
     def _fake_anwser(self):
         future = asyncio.Future()
-        future.set_result(self.kwargs["return_value"])
+        if "return_value" in self.kwargs:
+            future.set_result(self.kwargs["return_value"])
+        else:
+            future.set_result(True)
         return future