Format benchmark smoke tests

Author: HermiaHuan

tests/benchmarks/test_benchmark_latency.py

@@ -25,4 +25,4 @@ def test_benchmark_latency(tmp_path):
 
     data = json.loads(output_json.read_text())
     assert data.get("avg_latency", 0) > 0
-    assert data.get("latencies")
+    assert data.get("latencies")

tests/run.py

@@ -367,7 +367,6 @@ def _discover_benchmark_tests(self) -> list[TestCase]:
 
         return cases
 
-
     # --- Test execution ------------------------------------------------------
 
     def _run_single(self, tc: TestCase) -> TestResult: