diff --git a/examples/classification/test_run.py b/examples/classification/test_run.py
new file mode 100644
index 0000000..83c0fa6
--- /dev/null
+++ b/examples/classification/test_run.py
@@ -0,0 +1,32 @@
+import pytest
+
+from examples.planning.run import extract_person, extract_people, Person
+
+
+@pytest.mark.asyncio
+async def test_extract_person():
+    # Test the extract_person function with a known input
+    text = "John is 45 years old"
+    expected_person = Person(name="John", age=45)
+    person = await extract_person(text)
+    assert (
+        person == expected_person
+    ), "The extracted person does not match the expected person"
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    "names_and_ages, expected_people",
+    [
+        (
+            ["Alice is 30 years old", "Bob is 24 years old"],
+            [Person(name="Alice", age=30), Person(name="Bob", age=24)],
+        )
+    ],
+)
+async def test_extract_people(names_and_ages, expected_people):
+    # Test the extract_people function with a list of known inputs
+    people = await extract_people(names_and_ages)
+    assert (
+        people == expected_people
+    ), "The extracted people do not match the expected people"
diff --git a/examples/match_language/run_v1.py b/examples/match_language/run_v1.py
index 67326fa..28f2d7e 100644
--- a/examples/match_language/run_v1.py
+++ b/examples/match_language/run_v1.py
@@ -50,6 +50,7 @@ client = patch(AsyncOpenAI())
 class GeneratedSummary(BaseModel):
     summary: str
 
+
 async def summarize_text(text: str):
     response = await client.chat.completions.create(
         model="gpt-3.5-turbo",
diff --git a/examples/match_language/run_v2.py b/examples/match_language/run_v2.py
index e8ce294..84ca894 100644
--- a/examples/match_language/run_v2.py
+++ b/examples/match_language/run_v2.py
@@ -53,6 +53,7 @@ class GeneratedSummary(BaseModel):
     )
     summary: str
 
+
 async def summarize_text(text: str):
     response = await client.chat.completions.create(
         model="gpt-3.5-turbo",
@@ -94,4 +95,4 @@ if __name__ == "__main__":
     Source: de, Summary: de, Match: True, Detected: de
     Source: hi, Summary: hi, Match: True, Detected: hi
     Source: ja, Summary: ja, Match: True, Detected: ja
-    """
\ No newline at end of file
+    """
diff --git a/instructor/anthropic_utils.py b/instructor/anthropic_utils.py
index d9fd9f7..ab38a48 100644
--- a/instructor/anthropic_utils.py
+++ b/instructor/anthropic_utils.py
@@ -75,7 +75,7 @@ def _add_params(
             field_type = details.get(
                 "type", "unknown"
             )  # Might be better to fail here if there is no type since pydantic models require types
-        
+
         if "array" in field_type and "items" not in details:
             raise ValueError("Invalid array item.")
 
@@ -83,7 +83,7 @@ def _add_params(
         if "array" in field_type and "$ref" in details["items"]:
             type_element.text = f"List[{details['title']}]"
             list_found = True
-            nested_list_found = True     
+            nested_list_found = True
         # Check for non-nested List
         elif "array" in field_type and "type" in details["items"]:
             type_element.text = f"List[{details['items']['type']}]"
diff --git a/instructor/function_calls.py b/instructor/function_calls.py
index f63040e..3e0f9c9 100644
--- a/instructor/function_calls.py
+++ b/instructor/function_calls.py
@@ -69,7 +69,6 @@ class OpenAISchema(BaseModel):  # type: ignore[misc]
             for line in parseString(json_to_xml(cls)).toprettyxml().splitlines()[1:]
         )
 
-
     @classmethod
     def from_response(
         cls,
diff --git a/tests/anthropic/test_simple.py b/tests/anthropic/test_simple.py
index 205306a..98c8666 100644
--- a/tests/anthropic/test_simple.py
+++ b/tests/anthropic/test_simple.py
@@ -68,9 +68,9 @@ def test_list():
         name: str
         age: int
         family: List[str]
-    
+
     resp = create(
-        model="claude-3-opus-20240229", # Fails with claude-3-haiku-20240307
+        model="claude-3-opus-20240229",  # Fails with claude-3-haiku-20240307
         max_tokens=1024,
         max_retries=0,
         messages=[
@@ -81,13 +81,13 @@ def test_list():
         ],
         response_model=User,
     )
-    
+
     assert isinstance(resp, User)
     assert isinstance(resp.family, List)
     for member in resp.family:
         assert isinstance(member, str)
 
-        
+
 def test_nested_list():
     class Properties(BaseModel):
         key: str