diff --git a/libs/partners/anthropic/tests/unit_tests/test_chat_models.py b/libs/partners/anthropic/tests/unit_tests/test_chat_models.py
index a6499bce3cb..3ffc1bf02d6 100644
--- a/libs/partners/anthropic/tests/unit_tests/test_chat_models.py
+++ b/libs/partners/anthropic/tests/unit_tests/test_chat_models.py
@@ -93,13 +93,18 @@ def test_validate_max_tokens() -> None:
     assert llm.max_tokens == 1024
 
     # Test that existing max_tokens values are preserved
-    llm = ChatAnthropic(model="claude-3-5-sonnet-latest", max_tokens=2048, anthropic_api_key="test")
+    llm = ChatAnthropic(
+        model="claude-3-5-sonnet-latest", max_tokens=2048, anthropic_api_key="test"
+    )
     assert llm.max_tokens == 2048
 
     # Test that explicitly set max_tokens values are preserved
-    llm = ChatAnthropic(model="claude-3-5-sonnet-latest", max_tokens=4096, anthropic_api_key="test")
+    llm = ChatAnthropic(
+        model="claude-3-5-sonnet-latest", max_tokens=4096, anthropic_api_key="test"
+    )
     assert llm.max_tokens == 4096
 
+
 @pytest.mark.requires("anthropic")
 def test_anthropic_model_name_param() -> None:
     llm = ChatAnthropic(model_name="foo")  # type: ignore[call-arg, call-arg]
@@ -142,7 +147,6 @@ def test_anthropic_initialization() -> None:
     ChatAnthropic(model="test", anthropic_api_key="test")  # type: ignore[call-arg, call-arg]
 
 
-
 def test__format_output() -> None:
     anthropic_msg = Message(
         id="foo",