diff --git a/test/unit_tests/conftest.py b/test/unit_tests/conftest.py
index 611cc3f..ebca268 100644
--- a/test/unit_tests/conftest.py
+++ b/test/unit_tests/conftest.py
@@ -175,7 +175,7 @@ def pdf(image_metadata_pairs):
     for pair in image_metadata_pairs:
         add_image(pdf, pair)
 
-    return pdf_object_to_actual_pdf(pdf)
+    return pdf_stream(pdf)
 
 
 def add_image(pdf, image_metadata_pair):
@@ -190,7 +190,7 @@ def fewer_pages_then_required(page_idx, pdf):
     return page_idx > pdf.page - 1
 
 
-def pdf_object_to_actual_pdf(pdf):
+def pdf_stream(pdf: fpdf.fpdf.FPDF):
     return pdf.output(dest="S").encode("latin1")