diff --git a/tests/unit/views/preview_image_test.py b/tests/unit/views/preview_image_test.py
index 225dcd642..f9492bf5f 100644
--- a/tests/unit/views/preview_image_test.py
+++ b/tests/unit/views/preview_image_test.py
@@ -1,6 +1,5 @@
-import io
-
 import pytest
+from io import BytesIO
 from magic import from_buffer
 from PIL import Image
 
@@ -15,11 +14,9 @@ def test_preview_image_jobs(project_expo2011) -> None:
 
 
 @pytest.mark.usefixtures('project_expo2011', 'all_fixtures')
-def test_preview_image_size(project_expo2011) -> None:
+def test_preview_image_size_mimeytpe(project_expo2011) -> None:
     render_project_preview_image(project_id=project_expo2011.id)
-    with Image.open(io.BytesIO(project_expo2011.preview_image)) as preview_image:
+    with Image.open(BytesIO(project_expo2011.preview_image)) as preview_image:
         assert preview_image.size == (1280, 720)
-    image_mimetype = from_buffer(
-        io.BytesIO(project_expo2011.preview_image).read(2048), mime=True
-    )
+    image_mimetype = from_buffer(BytesIO(project_expo2011.preview_image).read(2048), mime=True)
     assert image_mimetype == 'image/png'