diff --git a/tests/test_cli_tools.py b/tests/test_cli_tools.py
index a4ca0a0bc..ebfd1d67d 100644
--- a/tests/test_cli_tools.py
+++ b/tests/test_cli_tools.py
@@ -199,9 +199,11 @@ def test_tools_install_covers_unknown_pypi_force_and_failures(
     monkeypatch.setattr(
         cli_tools.binaries,
         "resolve",
-        lambda name: (_ for _ in ()).throw(binaries.OfflineError("offline"))
-        if name == "broken"
-        else Path(f"C:\\cache\\{name}.exe"),
+        lambda name: (
+            (_ for _ in ()).throw(binaries.OfflineError("offline"))
+            if name == "broken"
+            else Path(f"C:\\cache\\{name}.exe")
+        ),
     )
 
     result = runner.invoke(
diff --git a/tests/test_memory_handler_native_ops.py b/tests/test_memory_handler_native_ops.py
index ef80a5a0d..982f3d0a6 100644
--- a/tests/test_memory_handler_native_ops.py
+++ b/tests/test_memory_handler_native_ops.py
@@ -895,8 +895,9 @@ async def test_memory_handler_misc_helpers(monkeypatch: pytest.MonkeyPatch, tmp_
         __import__("sys").modules,
         "headroom.memory.tools",
         SimpleNamespace(
-            get_memory_tools_optimized=lambda: calls.__setitem__("count", calls["count"] + 1)
-            or [{"name": "tool"}]
+            get_memory_tools_optimized=lambda: (
+                calls.__setitem__("count", calls["count"] + 1) or [{"name": "tool"}]
+            )
         ),
     )
     cache_handler = MemoryHandler(MemoryConfig(enabled=False), agent_type="codex")
diff --git a/tests/test_memory_wrapper.py b/tests/test_memory_wrapper.py
index ab9631023..c09a4c5e3 100644
--- a/tests/test_memory_wrapper.py
+++ b/tests/test_memory_wrapper.py
@@ -159,8 +159,9 @@ def test_wrapped_completions_create_injects_parses_and_stores(
     )
     monkeypatch.setattr(
         "headroom.memory.wrapper.inject_memory_instruction",
-        lambda messages, short=True: messages
-        + [{"role": "system", "content": "memory-instruction"}],
+        lambda messages, short=True: (
+            messages + [{"role": "system", "content": "memory-instruction"}]
+        ),
     )
     monkeypatch.setattr(
         "headroom.memory.wrapper.parse_response_with_memory",
diff --git a/tests/test_pipeline.py b/tests/test_pipeline.py
index ce7d1b78a..1fec1f8b3 100644
--- a/tests/test_pipeline.py
+++ b/tests/test_pipeline.py
@@ -39,14 +39,16 @@ def test_discover_pipeline_extensions_handles_load_and_init_failures(
     monkeypatch.setattr(
         importlib.metadata,
         "entry_points",
-        lambda group=None: [
-            FakeEntryPoint("working-instance", WorkingExtension()),
-            FakeEntryPoint("working-class", WorkingExtension),
-            FakeEntryPoint("bad-load", RuntimeError("bad load")),
-            FakeEntryPoint("bad-init", NeedsInit),
-        ]
-        if group == ENTRY_POINT_GROUP
-        else [],
+        lambda group=None: (
+            [
+                FakeEntryPoint("working-instance", WorkingExtension()),
+                FakeEntryPoint("working-class", WorkingExtension),
+                FakeEntryPoint("bad-load", RuntimeError("bad load")),
+                FakeEntryPoint("bad-init", NeedsInit),
+            ]
+            if group == ENTRY_POINT_GROUP
+            else []
+        ),
     )
 
     discovered = discover_pipeline_extensions()
diff --git a/tests/test_proxy_handlers_batch.py b/tests/test_proxy_handlers_batch.py
index d2af8784f..765e1164e 100644
--- a/tests/test_proxy_handlers_batch.py
+++ b/tests/test_proxy_handlers_batch.py
@@ -836,12 +836,14 @@ async def test_handle_google_batch_create_covers_passthrough_revert_and_store_fa
 
     pipeline_calls: list[dict[str, object]] = []
     handler.openai_pipeline = SimpleNamespace(
-        apply=lambda **kwargs: pipeline_calls.append(kwargs)
-        or SimpleNamespace(
-            messages=[{"role": "user", "content": "inflated"}],
-            timing={},
-            tokens_before=40,
-            tokens_after=80,
+        apply=lambda **kwargs: (
+            pipeline_calls.append(kwargs)
+            or SimpleNamespace(
+                messages=[{"role": "user", "content": "inflated"}],
+                timing={},
+                tokens_before=40,
+                tokens_after=80,
+            )
         )
     )
 
diff --git a/tests/test_relevance_extra.py b/tests/test_relevance_extra.py
index 1dc25a29f..62a8fa895 100644
--- a/tests/test_relevance_extra.py
+++ b/tests/test_relevance_extra.py
@@ -107,9 +107,9 @@ def test_embedding_score_and_batch_with_fake_model(monkeypatch) -> None:
     monkeypatch.setattr(
         scorer,
         "_encode",
-        lambda texts: [[1.0, 0.0], [0.5, 0.5]]
-        if len(texts) == 2
-        else [[1.0, 0.0], [0.0, 1.0], [1.0, 0.0]],
+        lambda texts: (
+            [[1.0, 0.0], [0.5, 0.5]] if len(texts) == 2 else [[1.0, 0.0], [0.0, 1.0], [1.0, 0.0]]
+        ),
     )
     monkeypatch.setattr(
         embedding, "_cosine_similarity", lambda a, b: 0.75 if a == [1.0, 0.0] else 0.25
diff --git a/tests/test_storage_backends.py b/tests/test_storage_backends.py
index 0521c8ade..00860d556 100644
--- a/tests/test_storage_backends.py
+++ b/tests/test_storage_backends.py
@@ -130,7 +130,7 @@ def test_create_storage_builtin_entrypoint_and_fallback(monkeypatch, tmp_path: P
 
     monkeypatch.setattr(
         "importlib.metadata.entry_points",
-        lambda group: [SimpleNamespace(name="other", load=lambda: (lambda url: created))],
+        lambda group: [SimpleNamespace(name="other", load=lambda: lambda url: created)],
     )
     missing_ep = create_storage("custom://missing.db")
     assert isinstance(missing_ep, FakeSQLiteStorage)
@@ -289,6 +289,6 @@ def test_sqlite_storage_get_conn_reuses_connection_and_create_storage_entrypoint
     created = DummyStorage()
     monkeypatch.setattr(
         "importlib.metadata.entry_points",
-        lambda group: [SimpleNamespace(name="custom", load=lambda: (lambda url: created))],
+        lambda group: [SimpleNamespace(name="custom", load=lambda: lambda url: created)],
     )
     assert create_storage("custom://db") is created