diff --git a/requirements-test.txt b/requirements-test.txt
index 584dbb5..00557c9 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,2 +1,3 @@
 pytest
+pytest-mock
 swh.scheduler[testing]
diff --git a/swh/loader/git/tests/test_tasks.py b/swh/loader/git/tests/test_tasks.py
index 46a795d..bc79058 100644
--- a/swh/loader/git/tests/test_tasks.py
+++ b/swh/loader/git/tests/test_tasks.py
@@ -1,51 +1,52 @@
 # Copyright (C) 2018-2019  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
-from unittest.mock import patch
 
-
-@patch('swh.loader.git.loader.GitLoader.load')
-def test_git_loader(mock_loader, swh_app, celery_session_worker):
+def test_git_loader(mocker, swh_app, celery_session_worker):
+    mock_loader = mocker.patch('swh.loader.git.loader.GitLoader.load')
     mock_loader.return_value = {'status': 'eventful'}
 
     res = swh_app.send_task(
         'swh.loader.git.tasks.UpdateGitRepository',
         ('origin_url',))
     assert res
     res.wait()
     assert res.successful()
 
     assert res.result == {'status': 'eventful'}
     mock_loader.assert_called_once_with()
 
 
-@patch('swh.loader.git.from_disk.GitLoaderFromDisk.load')
-def test_git_loader_from_disk(mock_loader, swh_app, celery_session_worker):
+def test_git_loader_from_disk(mocker, swh_app, celery_session_worker):
+    mock_loader = mocker.patch(
+        'swh.loader.git.from_disk.GitLoaderFromDisk.load')
     mock_loader.return_value = {'status': 'uneventful'}
 
     res = swh_app.send_task(
         'swh.loader.git.tasks.LoadDiskGitRepository',
         ('origin_url2', '/some/repo', '2018-12-10 00:00'))
     assert res
     res.wait()
     assert res.successful()
 
     assert res.result == {'status': 'uneventful'}
     mock_loader.assert_called_once_with()
 
 
-@patch('swh.loader.git.from_disk.GitLoaderFromArchive.load')
-def test_git_loader_from_archive(mock_loader, swh_app, celery_session_worker):
+def test_git_loader_from_archive(mocker, swh_app, celery_session_worker):
+    mock_loader = mocker.patch(
+        'swh.loader.git.from_disk.GitLoaderFromArchive.load')
+
     mock_loader.return_value = {'status': 'failed'}
 
     res = swh_app.send_task(
         'swh.loader.git.tasks.UncompressAndLoadDiskGitRepository',
         ('origin_url3', '/some/repo', '2017-01-10 00:00'))
     assert res
     res.wait()
     assert res.successful()
 
     assert res.result == {'status': 'failed'}
     mock_loader.assert_called_once_with()