diff --git a/Makefile.local b/Makefile.local
--- a/Makefile.local
+++ b/Makefile.local
@@ -1 +1 @@
-TEST_DIRS := ./swh/core/tests
+TEST_DIRS := ./swh/core/api/tests ./swh/core/db/tests ./swh/core/tests
diff --git a/requirements-test.txt b/requirements-test.txt
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,4 +1,5 @@
 pytest
+pytest-aiohttp
 pytest-mock
 requests-mock
 hypothesis >= 3.11.0
diff --git a/swh/core/api/tests/test_async.py b/swh/core/api/tests/test_async.py
--- a/swh/core/api/tests/test_async.py
+++ b/swh/core/api/tests/test_async.py
@@ -18,8 +18,6 @@
 )
 from swh.core.api.serializers import SWHJSONEncoder, json_dumps, msgpack_dumps
 
-pytest_plugins = ["aiohttp.pytest_plugin", "pytester"]
-
 
 class TestServerException(Exception):
     pass