diff --git a/tests/infra/interfaces.py b/tests/infra/interfaces.py
index 233d37c3d77..64859685cb3 100644
--- a/tests/infra/interfaces.py
+++ b/tests/infra/interfaces.py
@@ -132,7 +132,9 @@ def from_json(json):
 @dataclass
 class RedirectionConfig:
     to_primary: NodeByRoleResolver = field(default_factory=lambda: NodeByRoleResolver())
-    to_backup: NodeByRoleResolver = field(default_factory=lambda: NodeByRoleResolver(target=TargetRole(NodeRole.backup)))
+    to_backup: NodeByRoleResolver = field(
+        default_factory=lambda: NodeByRoleResolver(target=TargetRole(NodeRole.backup))
+    )
 
     @staticmethod
     def to_json(rc):
@@ -172,18 +174,36 @@ class RPCInterface(Interface):
     public_host: Optional[str] = None
     # Host port
     public_port: Optional[int] = None
-    max_open_sessions_soft: Optional[int] = field(default_factory=lambda: DEFAULT_MAX_OPEN_SESSIONS_SOFT)
-    max_open_sessions_hard: Optional[int] = field(default_factory=lambda: DEFAULT_MAX_OPEN_SESSIONS_HARD)
-    max_http_body_size: Optional[int] = field(default_factory=lambda: DEFAULT_MAX_HTTP_BODY_SIZE)
-    max_http_header_size: Optional[int] = field(default_factory=lambda: DEFAULT_MAX_HTTP_HEADER_SIZE)
-    max_http_headers_count: Optional[int] = field(default_factory=lambda: DEFAULT_MAX_HTTP_HEADERS_COUNT)
-    max_concurrent_streams_count: Optional[int] = field(default_factory=lambda: DEFAULT_MAX_CONCURRENT_STREAMS_COUNT)
-    initial_window_size: Optional[int] = field(default_factory=lambda: DEFAULT_INITIAL_WINDOW_SIZE)
-    max_frame_size: Optional[int] = field(default_factory=lambda: DEFAULT_MAX_FRAME_SIZE)
+    max_open_sessions_soft: Optional[int] = field(
+        default_factory=lambda: DEFAULT_MAX_OPEN_SESSIONS_SOFT
+    )
+    max_open_sessions_hard: Optional[int] = field(
+        default_factory=lambda: DEFAULT_MAX_OPEN_SESSIONS_HARD
+    )
+    max_http_body_size: Optional[int] = field(
+        default_factory=lambda: DEFAULT_MAX_HTTP_BODY_SIZE
+    )
+    max_http_header_size: Optional[int] = field(
+        default_factory=lambda: DEFAULT_MAX_HTTP_HEADER_SIZE
+    )
+    max_http_headers_count: Optional[int] = field(
+        default_factory=lambda: DEFAULT_MAX_HTTP_HEADERS_COUNT
+    )
+    max_concurrent_streams_count: Optional[int] = field(
+        default_factory=lambda: DEFAULT_MAX_CONCURRENT_STREAMS_COUNT
+    )
+    initial_window_size: Optional[int] = field(
+        default_factory=lambda: DEFAULT_INITIAL_WINDOW_SIZE
+    )
+    max_frame_size: Optional[int] = field(
+        default_factory=lambda: DEFAULT_MAX_FRAME_SIZE
+    )
     endorsement: Optional[Endorsement] = field(default_factory=lambda: Endorsement())
     acme_configuration: Optional[str] = None
     accepted_endpoints: Optional[str] = None
-    forwarding_timeout_ms: Optional[int] = field(default_factory=lambda: DEFAULT_FORWARDING_TIMEOUT_MS)
+    forwarding_timeout_ms: Optional[int] = field(
+        default_factory=lambda: DEFAULT_FORWARDING_TIMEOUT_MS
+    )
     redirections: Optional[RedirectionConfig] = None
     app_protocol: str = field(default_factory=lambda: "HTTP1")