diff --git a/test/unit_tests/conftest.py b/test/unit_tests/conftest.py
index 314b186..af380d4 100644
--- a/test/unit_tests/conftest.py
+++ b/test/unit_tests/conftest.py
@@ -1,3 +1,4 @@
+import io
 import random
 import tempfile
 from operator import itemgetter
@@ -162,16 +163,31 @@ def metadata(images):
 
 @pytest.fixture
 def pdf(images, metadata):
+
+    def add_image(image, metadata):
+
+        def fewer_pages_then_required():
+            return metadata["page_idx"] > pdf.page - 1
+
+        def add_image_to_last_page():
+            x, y, w, h = itemgetter("x1", "y1", "width", "height")(metadata)
+
+            with tempfile.NamedTemporaryFile(suffix=".png") as temp_image:
+                image.save(temp_image.name)
+                pdf.image(temp_image.name, x=x, y=y, w=w, h=h)
+
+        while fewer_pages_then_required():
+            pdf.add_page()
+
+        add_image_to_last_page()
+
+    def pdf_object_to_actual_pdf():
+        return pdf.output(dest="S").encode("latin1")
+
     pdf = fpdf.FPDF(unit="pt")
     pdf.add_page()
+
     for image, metadata in zip(images, metadata):
-        while metadata["page_idx"] > pdf.page - 1:
-            pdf.add_page()
-        x, y, w, h = itemgetter("x1", "y1", "width", "height")(metadata)
-        with tempfile.NamedTemporaryFile(suffix=".png") as temp_image:
-            image.save(temp_image.name)
-            pdf.image(temp_image.name, x=x, y=y, w=w, h=h)
-    with tempfile.NamedTemporaryFile(suffix=".pdf") as temp_pdf:
-        pdf.output(temp_pdf.name)
-        with open(temp_pdf.name, "rb") as open_temp_pdf:
-            yield open_temp_pdf.read()
+        add_image(image, metadata)
+
+    return pdf_object_to_actual_pdf()