diff --git a/test/runner.py b/test/runner.py
index 9b6fedce..2b4d771a 100755
--- a/test/runner.py
+++ b/test/runner.py
@@ -201,6 +201,7 @@ def make_metadata_settings(meta, endpoint, prefix):
         ]
     raise ValueError("invalid argument: unknown metadata backend: '%s'" % meta)
 
+
 def check_vineyard_for_ready(rpc_socket_port, timeout=60):
     """Check if vineyardd and internal etcd is ready."""
     ready = False
@@ -210,8 +211,11 @@ def check_vineyard_for_ready(rpc_socket_port, timeout=60):
             cmd = f"lsof -i :{rpc_socket_port}"
             result = subprocess.run(cmd, shell=True, capture_output=True, text=True)
             lines = result.stdout.strip().split('\n')
-            process_count = len(lines) - 1 if lines[0].startswith('COMMAND') else len(lines)
-            # If there are two processes listening on the rpc socket port, it means vineyardd and internal etcd are ready.
+            process_count = (
+                len(lines) - 1 if lines[0].startswith('COMMAND') else len(lines)
+            )
+            # If there are two processes listening on the rpc socket port,
+            # it means vineyardd and internal etcd are ready.
             if process_count == 2:
                 ready = True
         except Exception as e:
@@ -219,6 +223,7 @@ def check_vineyard_for_ready(rpc_socket_port, timeout=60):
         time.sleep(1)
     return ready
 
+
 @contextlib.contextmanager
 def start_vineyardd(
     metadata_settings,
@@ -270,6 +275,7 @@ def start_vineyardd(
                 time.sleep(1)
         yield proc_context, rpc_socket_port
 
+
 @contextlib.contextmanager
 def start_multiple_vineyardd(
     metadata_settings,
@@ -502,8 +508,8 @@ def run_vineyard_cpp_tests(meta, allocator, endpoints, tests):
 
 def run_vineyard_spill_tests(meta, allocator, endpoints, tests):
     meta_prefix = 'vineyard_test_%s' % time.time()
-    #client_port = find_port()
-    #endpoints = 'http://127.0.0.1:%d' % client_port
+    # client_port = find_port()
+    # endpoints = 'http://127.0.0.1:%d' % client_port
     metadata_settings = make_metadata_settings(meta, endpoints, meta_prefix)
     with start_vineyardd(
         metadata_settings,