diff --git a/conftest.py b/conftest.py
index 56d4feb28..099bc3f8e 100644
--- a/conftest.py
+++ b/conftest.py
@@ -1,6 +1,7 @@
-import pytest
 from pathlib import Path
 
+import pytest
+
 pytest_plugins = ("jupyter_server.pytest_plugin",)
 
 
@@ -11,7 +12,14 @@ def jp_server_config(jp_server_config):
 
 @pytest.fixture(scope="session")
 def static_test_files_dir() -> Path:
-    return Path(__file__).parent.resolve() / "packages" / "jupyter-ai" / "jupyter_ai" / "tests" / "static"
+    return (
+        Path(__file__).parent.resolve()
+        / "packages"
+        / "jupyter-ai"
+        / "jupyter_ai"
+        / "tests"
+        / "static"
+    )
 
 
 @pytest.fixture
diff --git a/packages/jupyter-ai/jupyter_ai/document_loaders/directory.py b/packages/jupyter-ai/jupyter_ai/document_loaders/directory.py
index cbb4197d5..2d50552a0 100644
--- a/packages/jupyter-ai/jupyter_ai/document_loaders/directory.py
+++ b/packages/jupyter-ai/jupyter_ai/document_loaders/directory.py
@@ -112,9 +112,11 @@ def flatten(*chunk_lists):
 """Selects eligible files, i.e.,
 1. Files not in excluded directories, and
 2. Files that are in the valid file extensions list
-Called from the `split` function. 
-Returns all the filepaths to eligible files. 
+Called from the `split` function.
+Returns all the filepaths to eligible files.
 """
+
+
 def collect_filepaths(path, all_files: bool):
     # Check if the path points to a single file
     if os.path.isfile(path):
@@ -139,6 +141,8 @@ def collect_filepaths(path, all_files: bool):
 
 
 """Splits files into chunks for vector db in RAG"""
+
+
 def split(path, all_files: bool, splitter):
     chunks = []
     filepaths = collect_filepaths(path, all_files)
diff --git a/packages/jupyter-ai/jupyter_ai/tests/static/.hidden_file.txt b/packages/jupyter-ai/jupyter_ai/tests/static/.hidden_file.txt
index 3a020444d..760cc808c 100644
--- a/packages/jupyter-ai/jupyter_ai/tests/static/.hidden_file.txt
+++ b/packages/jupyter-ai/jupyter_ai/tests/static/.hidden_file.txt
@@ -1,2 +1 @@
-Hidden temp text file. 
-
+Hidden temp text file.
diff --git a/packages/jupyter-ai/jupyter_ai/tests/static/file1.txt b/packages/jupyter-ai/jupyter_ai/tests/static/file1.txt
index 2deb487fa..008cb927a 100644
--- a/packages/jupyter-ai/jupyter_ai/tests/static/file1.txt
+++ b/packages/jupyter-ai/jupyter_ai/tests/static/file1.txt
@@ -1,2 +1 @@
-This is a temp test text file. 
-
+This is a temp test text file.
diff --git a/packages/jupyter-ai/jupyter_ai/tests/static/file2.py b/packages/jupyter-ai/jupyter_ai/tests/static/file2.py
index 6b4e9522e..746e17199 100644
--- a/packages/jupyter-ai/jupyter_ai/tests/static/file2.py
+++ b/packages/jupyter-ai/jupyter_ai/tests/static/file2.py
@@ -1,2 +1,3 @@
 import os
-print("Hello World")
\ No newline at end of file
+
+print("Hello World")
diff --git a/packages/jupyter-ai/jupyter_ai/tests/static/file3.csv b/packages/jupyter-ai/jupyter_ai/tests/static/file3.csv
index 5bf7c55af..01fba4acc 100644
--- a/packages/jupyter-ai/jupyter_ai/tests/static/file3.csv
+++ b/packages/jupyter-ai/jupyter_ai/tests/static/file3.csv
@@ -1,3 +1,2 @@
 Column1, Column2
 Test1, test2
-
diff --git a/packages/jupyter-ai/jupyter_ai/tests/test_directory.py b/packages/jupyter-ai/jupyter_ai/tests/test_directory.py
index 8a7b33032..0695c2e10 100644
--- a/packages/jupyter-ai/jupyter_ai/tests/test_directory.py
+++ b/packages/jupyter-ai/jupyter_ai/tests/test_directory.py
@@ -6,11 +6,13 @@
 
 import os
 import shutil
-import pytest
 from pathlib import Path
 from typing import Tuple
+
+import pytest
 from jupyter_ai.document_loaders.directory import collect_filepaths
 
+
 @pytest.fixture
 def staging_dir(static_test_files_dir, jp_ai_staging_dir) -> Path:
     file1_path = static_test_files_dir / ".hidden_file.pdf"
@@ -42,6 +44,8 @@ def staging_dir(static_test_files_dir, jp_ai_staging_dir) -> Path:
 
 
 """Test that the number of valid files for `/learn` is correct"""
+
+
 def test_collect_filepaths(staging_dir):
     all_files = False
     staging_dir_filepath = staging_dir
@@ -51,5 +55,5 @@ def test_collect_filepaths(staging_dir):
     assert len(result) == 3  # Test number of valid files
 
     filenames = [fp.name for fp in result]
-    assert "file0.html" in filenames # Check that valid file is included
-    assert "file3.xyz" not in filenames # Check that invalid file is excluded
\ No newline at end of file
+    assert "file0.html" in filenames  # Check that valid file is included
+    assert "file3.xyz" not in filenames  # Check that invalid file is excluded