diff --git a/tests/test_atproto_client/models/tests/test_string_formats.py b/tests/test_atproto_client/models/tests/test_string_formats.py
index 16725ee4..dd973d08 100644
--- a/tests/test_atproto_client/models/tests/test_string_formats.py
+++ b/tests/test_atproto_client/models/tests/test_string_formats.py
@@ -11,44 +11,61 @@
 # https://github.com/bluesky-social/atproto/tree/main/interop-test-files/syntax
 INTEROP_TEST_FILES_DIR: Path = Path('tests/test_atproto_client/interop-test-files/syntax')
 
+
 def get_test_cases(filename: str) -> list[str]:
     """Get non-comment, non-empty lines from an interop test file."""
     return [
-        line.strip() for line in INTEROP_TEST_FILES_DIR.joinpath(filename).read_text().splitlines()
+        line.strip()
+        for line in INTEROP_TEST_FILES_DIR.joinpath(filename).read_text().splitlines()
         if line.strip() and not line.startswith('#')
     ]
 
+
 @pytest.fixture
 def valid_handles() -> list[str]:
     return get_test_cases('handle_syntax_valid.txt')
 
+
 @pytest.fixture
 def valid_dids() -> list[str]:
     return get_test_cases('did_syntax_valid.txt')
 
+
 @pytest.fixture
 def valid_nsids() -> list[str]:
     return get_test_cases('nsid_syntax_valid.txt')
 
+
 @pytest.fixture
 def valid_aturis() -> list[str]:
     return get_test_cases('aturi_syntax_valid.txt')
 
+
 @pytest.fixture
 def valid_datetimes() -> list[str]:
     return get_test_cases('datetime_syntax_valid.txt')
 
+
 @pytest.fixture
 def valid_tids() -> list[str]:
     return get_test_cases('tid_syntax_valid.txt')
 
+
 @pytest.fixture
 def valid_record_keys() -> list[str]:
     return get_test_cases('recordkey_syntax_valid.txt')
 
+
 @pytest.fixture
-def valid_data(valid_handles: list[str], valid_dids: list[str], valid_nsids: list[str], valid_aturis: list[str],
-               valid_datetimes: list[str], valid_tids: list[str], valid_record_keys: list[str]) -> dict:
+def valid_data(
+    valid_handles: list[str],
+    valid_dids: list[str],
+    valid_nsids: list[str],
+    valid_aturis: list[str],
+    valid_datetimes: list[str],
+    valid_tids: list[str],
+    valid_record_keys: list[str],
+) -> dict:
     return {
         'handle': valid_handles[0],
         'did': valid_dids[0],
@@ -62,6 +79,7 @@ def valid_data(valid_handles: list[str], valid_dids: list[str], valid_nsids: lis
         'language': 'en-US',  # No interop test file for language
     }
 
+
 @pytest.fixture
 def invalid_data() -> dict:
     return {
@@ -77,6 +95,7 @@ def invalid_data() -> dict:
         'language': 'invalid!',  # No interop test file for language
     }
 
+
 @pytest.mark.parametrize(
     'validator_type,field_name,expected_error',
     [