diff --git a/PyPDFForm/wrapper.py b/PyPDFForm/wrapper.py
index a2ed2470..53fb5b02 100644
--- a/PyPDFForm/wrapper.py
+++ b/PyPDFForm/wrapper.py
@@ -175,4 +175,6 @@ def register_font(
 
         ttf_file = adapter.fp_or_f_obj_or_stream_to_stream(ttf_file)
 
-        return font.register_font(font_name, ttf_file) if ttf_file is not None else False
+        return (
+            font.register_font(font_name, ttf_file) if ttf_file is not None else False
+        )
diff --git a/tests/test_fill_max_length_text_field.py b/tests/test_fill_max_length_text_field.py
index b6e5cb14..7bf19c2f 100644
--- a/tests/test_fill_max_length_text_field.py
+++ b/tests/test_fill_max_length_text_field.py
@@ -9,7 +9,10 @@ def test_fill_max_length_text_field_all_chars(
     sample_template_with_max_length_text_field, max_length_expected_directory
 ):
     with open(
-        os.path.join(max_length_expected_directory, "max_length_text_field_all_chars.pdf"), "rb+"
+        os.path.join(
+            max_length_expected_directory, "max_length_text_field_all_chars.pdf"
+        ),
+        "rb+",
     ) as f:
         obj = PyPDFForm(sample_template_with_max_length_text_field).fill(
             {
@@ -31,7 +34,10 @@ def test_fill_max_length_text_field_odd_chars(
     sample_template_with_max_length_text_field, max_length_expected_directory
 ):
     with open(
-        os.path.join(max_length_expected_directory, "max_length_text_field_odd_chars.pdf"), "rb+"
+        os.path.join(
+            max_length_expected_directory, "max_length_text_field_odd_chars.pdf"
+        ),
+        "rb+",
     ) as f:
         obj = PyPDFForm(sample_template_with_max_length_text_field).fill(
             {
@@ -53,7 +59,10 @@ def test_fill_max_length_text_field_even_chars(
     sample_template_with_max_length_text_field, max_length_expected_directory
 ):
     with open(
-        os.path.join(max_length_expected_directory, "max_length_text_field_even_chars.pdf"), "rb+"
+        os.path.join(
+            max_length_expected_directory, "max_length_text_field_even_chars.pdf"
+        ),
+        "rb+",
     ) as f:
         obj = PyPDFForm(sample_template_with_max_length_text_field).fill(
             {
@@ -75,7 +84,8 @@ def test_fill_comb_text_field_all_chars(
     sample_template_with_comb_text_field, max_length_expected_directory
 ):
     with open(
-        os.path.join(max_length_expected_directory, "comb_text_field_all_chars.pdf"), "rb+"
+        os.path.join(max_length_expected_directory, "comb_text_field_all_chars.pdf"),
+        "rb+",
     ) as f:
         obj = PyPDFForm(sample_template_with_comb_text_field).fill(
             {
@@ -97,7 +107,8 @@ def test_fill_comb_text_field_odd_chars(
     sample_template_with_comb_text_field, max_length_expected_directory
 ):
     with open(
-        os.path.join(max_length_expected_directory, "comb_text_field_odd_chars.pdf"), "rb+"
+        os.path.join(max_length_expected_directory, "comb_text_field_odd_chars.pdf"),
+        "rb+",
     ) as f:
         obj = PyPDFForm(sample_template_with_comb_text_field).fill(
             {
@@ -119,7 +130,8 @@ def test_fill_comb_text_field_even_chars(
     sample_template_with_comb_text_field, max_length_expected_directory
 ):
     with open(
-        os.path.join(max_length_expected_directory, "comb_text_field_even_chars.pdf"), "rb+"
+        os.path.join(max_length_expected_directory, "comb_text_field_even_chars.pdf"),
+        "rb+",
     ) as f:
         obj = PyPDFForm(sample_template_with_comb_text_field).fill(
             {
@@ -140,7 +152,9 @@ def test_fill_comb_text_field_even_chars(
 def test_fill_comb_text_field_void(
     sample_template_with_comb_text_field, max_length_expected_directory
 ):
-    with open(os.path.join(max_length_expected_directory, "comb_text_field_void.pdf"), "rb+") as f:
+    with open(
+        os.path.join(max_length_expected_directory, "comb_text_field_void.pdf"), "rb+"
+    ) as f:
         obj = PyPDFForm(sample_template_with_comb_text_field).fill({})
 
         expected = f.read()
@@ -154,7 +168,8 @@ def test_fill_comb_text_field_even_chars_right_aligned(
 ):
     with open(
         os.path.join(
-            max_length_expected_directory, "comb_text_field_even_chars_right_aligned.pdf"
+            max_length_expected_directory,
+            "comb_text_field_even_chars_right_aligned.pdf",
         ),
         "rb+",
     ) as f:
diff --git a/tests/test_functional.py b/tests/test_functional.py
index 3bac7580..39b4770e 100644
--- a/tests/test_functional.py
+++ b/tests/test_functional.py
@@ -38,10 +38,7 @@ def test_fill_font_liberation_serif_italic(
     with open(os.path.join(font_samples, "LiberationSerif-Italic.ttf"), "rb+") as _f:
         stream = _f.read()
         _f.seek(0)
-        PyPDFForm.register_font(
-            "LiberationSerif-Italic",
-            stream
-        )
+        PyPDFForm.register_font("LiberationSerif-Italic", stream)
 
     with open(
         os.path.join(pdf_samples, "sample_filled_font_liberation_serif_italic.pdf"),