diff --git a/tests/test_api.py b/tests/test_api.py
index 4c57f38..f726866 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -17,7 +17,11 @@ def handler(request: httpx2.Request) -> httpx2.Response:
         )
 
     mock_http_client = httpx2.AsyncClient(transport=httpx2.MockTransport(handler))
-    generator = ClaudeAnswerGenerator(api_key="test-key", model="test-model", client=mock_http_client)
+    generator = ClaudeAnswerGenerator(
+        api_key="test-key",
+        model="test-model",
+        client=mock_http_client,
+    )
     pipeline = RagPipeline(generator=generator)
     app = create_app(pipeline=pipeline)
     return TestClient(app)
@@ -40,7 +44,10 @@ def test_querying_before_any_document_is_ingested_returns_no_sources(client):
 
 
 def test_querying_after_ingesting_returns_a_cited_answer(client):
-    client.post("/documents", json={"document_id": "animals", "text": "Cats are small domesticated mammals."})
+    client.post(
+        "/documents",
+        json={"document_id": "animals", "text": "Cats are small domesticated mammals."},
+    )
 
     response = client.post("/query", json={"question": "Are cats mammals?"})
 
diff --git a/tests/test_generation.py b/tests/test_generation.py
index 889fdcf..fd9ff30 100644
--- a/tests/test_generation.py
+++ b/tests/test_generation.py
@@ -11,8 +11,14 @@
 
 def test_grounded_prompt_includes_every_source_and_the_question():
     results = [
-        SearchResult(chunk=Chunk(document_id="doc-a", index=0, text="Cats are mammals."), score=0.9),
-        SearchResult(chunk=Chunk(document_id="doc-b", index=1, text="Dogs are mammals too."), score=0.5),
+        SearchResult(
+            chunk=Chunk(document_id="doc-a", index=0, text="Cats are mammals."),
+            score=0.9,
+        ),
+        SearchResult(
+            chunk=Chunk(document_id="doc-b", index=1, text="Dogs are mammals too."),
+            score=0.5,
+        ),
     ]
 
     prompt = build_grounded_prompt("Are cats mammals?", results)
@@ -26,12 +32,20 @@ def test_grounded_prompt_includes_every_source_and_the_question():
 
 async def test_generator_sends_the_grounded_prompt_and_returns_the_answer(build_mock_client):
     captured = {}
-    results = [SearchResult(chunk=Chunk(document_id="doc-a", index=0, text="Cats are mammals."), score=0.9)]
+    results = [
+        SearchResult(
+            chunk=Chunk(document_id="doc-a", index=0, text="Cats are mammals."),
+            score=0.9,
+        ),
+    ]
 
     def handler(request: httpx2.Request) -> httpx2.Response:
         captured["headers"] = request.headers
         captured["body"] = json.loads(request.content)
-        return httpx2.Response(200, json={"content": [{"type": "text", "text": "Yes, cats are mammals [source 1]."}]})
+        return httpx2.Response(
+            200,
+            json={"content": [{"type": "text", "text": "Yes, cats are mammals [source 1]."}]},
+        )
 
     generator = ClaudeAnswerGenerator(
         api_key="test-key", model="test-model", client=build_mock_client(handler)
diff --git a/tests/test_pipeline.py b/tests/test_pipeline.py
index ea62e2f..b27bc92 100644
--- a/tests/test_pipeline.py
+++ b/tests/test_pipeline.py
@@ -31,7 +31,10 @@ async def test_ingest_reports_how_many_chunks_it_created():
 
 async def test_ask_returns_the_generated_answer_with_matching_sources():
     def handler(request: httpx2.Request) -> httpx2.Response:
-        return httpx2.Response(200, json={"content": [{"type": "text", "text": "Cats are mammals."}]})
+        return httpx2.Response(
+            200,
+            json={"content": [{"type": "text", "text": "Cats are mammals."}]},
+        )
 
     pipeline = _pipeline_with_generator(handler)
     pipeline.ingest("animals", "Cats are small domesticated feline mammals.")