diff --git a/tests/integration/test_aws_cli_commands.py b/tests/integration/test_aws_cli_commands.py
index ab8aeff..ea5010e 100644
--- a/tests/integration/test_aws_cli_commands.py
+++ b/tests/integration/test_aws_cli_commands.py
@@ -138,7 +138,9 @@ class TestSyncCommand:
                 return PutSummary(
                     operation="create_reference",
                     bucket="test-bucket",
-                    key=f"{delta_space.prefix}/{local_path.name}.delta" if delta_space.prefix else f"{local_path.name}.delta",
+                    key=f"{delta_space.prefix}/{local_path.name}.delta"
+                    if delta_space.prefix
+                    else f"{local_path.name}.delta",
                     original_name=local_path.name,
                     file_size=local_path.stat().st_size,
                     file_sha256="ghi789",
@@ -146,6 +148,7 @@ class TestSyncCommand:
                     delta_ratio=None,
                     ref_key=None,
                 )
+
             mock_service.put.side_effect = mock_put
 
             with patch("deltaglider.app.cli.main.create_service", return_value=mock_service):
diff --git a/tests/integration/test_bucket_management.py b/tests/integration/test_bucket_management.py
index df547c8..ede66c8 100644
--- a/tests/integration/test_bucket_management.py
+++ b/tests/integration/test_bucket_management.py
@@ -255,7 +255,9 @@ class TestBucketManagement:
 
         call_count = {"value": 0}
 
-        def fake_get_bucket_stats(_: Any, bucket: str, mode: str, use_cache: bool = True, refresh_cache: bool = False) -> BucketStats:
+        def fake_get_bucket_stats(
+            _: Any, bucket: str, mode: str, use_cache: bool = True, refresh_cache: bool = False
+        ) -> BucketStats:
             call_count["value"] += 1
             assert bucket == "bucket1"
             if mode == "detailed":
diff --git a/tests/integration/test_client.py b/tests/integration/test_client.py
index 9286f81..1ffa590 100644
--- a/tests/integration/test_client.py
+++ b/tests/integration/test_client.py
@@ -43,7 +43,15 @@ class MockStorage:
                 if obj_head is not None:
                     yield obj_head
 
-    def list_objects(self, bucket, prefix="", delimiter="", max_keys=1000, start_after=None, continuation_token=None):
+    def list_objects(
+        self,
+        bucket,
+        prefix="",
+        delimiter="",
+        max_keys=1000,
+        start_after=None,
+        continuation_token=None,
+    ):
         """Mock list_objects operation for S3 features."""
         objects = []
         common_prefixes = set()
diff --git a/tests/integration/test_stats_command.py b/tests/integration/test_stats_command.py
index 8d5341d..5c21ef2 100644
--- a/tests/integration/test_stats_command.py
+++ b/tests/integration/test_stats_command.py
@@ -49,7 +49,9 @@ class TestStatsCommand:
             assert output["direct_objects"] == 3
 
             # Verify client was called correctly
-            mock_client.get_bucket_stats.assert_called_once_with("test-bucket", mode="quick", use_cache=True, refresh_cache=False)
+            mock_client.get_bucket_stats.assert_called_once_with(
+                "test-bucket", mode="quick", use_cache=True, refresh_cache=False
+            )
 
     def test_stats_json_output_detailed(self):
         """Test stats command with detailed JSON output."""
@@ -77,7 +79,9 @@ class TestStatsCommand:
             assert output["average_compression_ratio"] == 0.95
 
             # Verify detailed flag was passed
-            mock_client.get_bucket_stats.assert_called_once_with("test-bucket", mode="detailed", use_cache=True, refresh_cache=False)
+            mock_client.get_bucket_stats.assert_called_once_with(
+                "test-bucket", mode="detailed", use_cache=True, refresh_cache=False
+            )
 
     def test_stats_json_output_sampled(self):
         """Test stats command with sampled JSON output."""
@@ -101,7 +105,9 @@ class TestStatsCommand:
             result = runner.invoke(cli, ["stats", "test-bucket", "--sampled", "--json"])
 
             assert result.exit_code == 0
-            mock_client.get_bucket_stats.assert_called_once_with("test-bucket", mode="sampled", use_cache=True, refresh_cache=False)
+            mock_client.get_bucket_stats.assert_called_once_with(
+                "test-bucket", mode="sampled", use_cache=True, refresh_cache=False
+            )
 
     def test_stats_sampled_and_detailed_conflict(self):
         """--sampled and --detailed flags must be mutually exclusive."""
@@ -190,7 +196,9 @@ class TestStatsCommand:
 
             assert result.exit_code == 0
             # Verify bucket name was parsed correctly from S3 URL
-            mock_client.get_bucket_stats.assert_called_once_with("test-bucket", mode="quick", use_cache=True, refresh_cache=False)
+            mock_client.get_bucket_stats.assert_called_once_with(
+                "test-bucket", mode="quick", use_cache=True, refresh_cache=False
+            )
 
     def test_stats_with_s3_url_trailing_slash(self):
         """Test stats command with s3:// URL format with trailing slash."""
@@ -215,7 +223,9 @@ class TestStatsCommand:
 
             assert result.exit_code == 0
             # Verify bucket name was parsed correctly from S3 URL with trailing slash
-            mock_client.get_bucket_stats.assert_called_once_with("test-bucket", mode="quick", use_cache=True, refresh_cache=False)
+            mock_client.get_bucket_stats.assert_called_once_with(
+                "test-bucket", mode="quick", use_cache=True, refresh_cache=False
+            )
 
     def test_stats_with_s3_url_with_prefix(self):
         """Test stats command with s3:// URL format with prefix (should ignore prefix)."""
@@ -240,4 +250,6 @@ class TestStatsCommand:
 
             assert result.exit_code == 0
             # Verify only bucket name was extracted, prefix ignored
-            mock_client.get_bucket_stats.assert_called_once_with("test-bucket", mode="quick", use_cache=True, refresh_cache=False)
+            mock_client.get_bucket_stats.assert_called_once_with(
+                "test-bucket", mode="quick", use_cache=True, refresh_cache=False
+            )