diff --git a/swh/indexer/tests/test_ctags.py b/swh/indexer/tests/test_ctags.py
--- a/swh/indexer/tests/test_ctags.py
+++ b/swh/indexer/tests/test_ctags.py
@@ -23,7 +23,7 @@
 
 
 class BasicTest(unittest.TestCase):
-    @patch('swh.indexer.ctags.subprocess')
+    @patch("swh.indexer.ctags.subprocess")
     def test_run_ctags(self, mock_subprocess):
         """Computing licenses from a raw content should return results
 
diff --git a/swh/indexer/tests/test_fossology_license.py b/swh/indexer/tests/test_fossology_license.py
--- a/swh/indexer/tests/test_fossology_license.py
+++ b/swh/indexer/tests/test_fossology_license.py
@@ -21,7 +21,7 @@
 
 
 class BasicTest(unittest.TestCase):
-    @patch('swh.indexer.fossology_license.subprocess')
+    @patch("swh.indexer.fossology_license.subprocess")
     def test_compute_license(self, mock_subprocess):
         """Computing licenses from a raw content should return results
 
diff --git a/swh/indexer/tests/utils.py b/swh/indexer/tests/utils.py
--- a/swh/indexer/tests/utils.py
+++ b/swh/indexer/tests/utils.py
@@ -386,7 +386,7 @@
     'license': 'https://spdx.org/licenses/AGPL-3.0',
     'version': '1.0.0',
     'description':
-        'Tiny web service for parsing yarn.lock files',
+        "Tiny web service for parsing yarn.lock files",
     'issueTracker':
         'https://github.com/librariesio/yarn-parser/issues',
     'name': 'yarn-parser',