diff --git a/tests/norun/test_find.py b/tests/norun/test_find.py
index 24025b0f..6d02631d 100644
--- a/tests/norun/test_find.py
+++ b/tests/norun/test_find.py
@@ -20,4 +20,4 @@ def test_dont_find_image():
     r2d = make_r2d(["--image", image_name, "--no-run", str(HERE)])
 
     # Just don't actually start the build, so image won't be found
-    assert not r2d.find_image()
\ No newline at end of file
+    assert not r2d.find_image()
diff --git a/tests/norun/test_registry.py b/tests/norun/test_registry.py
index e65b2532..72526af3 100644
--- a/tests/norun/test_registry.py
+++ b/tests/norun/test_registry.py
@@ -116,4 +116,4 @@ def test_registry(registry, dind):
     r2d.start()
 
     proc = subprocess.run(["docker", "manifest", "inspect", "--insecure", image_name])
-    assert proc.returncode == 0
\ No newline at end of file
+    assert proc.returncode == 0
diff --git a/tests/unit/test_app.py b/tests/unit/test_app.py
index 02841ba4..0b573716 100644
--- a/tests/unit/test_app.py
+++ b/tests/unit/test_app.py
@@ -10,6 +10,7 @@ from repo2docker.__main__ import make_r2d
 from repo2docker.app import Repo2Docker
 from repo2docker.utils import chdir
 
+
 def test_image_name_remains_unchanged():
     # if we specify an image name, it should remain unmodified
     with TemporaryDirectory() as src: