Run StreamableHTTP transport tests in process instead of over sockets (#2767)

tests/test_helpers.py

@@ -2,7 +2,6 @@
 
 import socket
 import threading
-import time
 from collections.abc import Generator
 from contextlib import contextmanager
 from typing import Any
@@ -56,30 +55,3 @@ def run_uvicorn_in_thread(app: Any, **config_kwargs: Any) -> Generator[str, None
     finally:
         server.should_exit = True
         thread.join(timeout=_SERVER_SHUTDOWN_TIMEOUT_S)
-
-
-def wait_for_server(port: int, timeout: float = 20.0) -> None:
-    """Wait for server to be ready to accept connections.
-
-    Polls the server port until it accepts connections or timeout is reached.
-    This eliminates race conditions without arbitrary sleeps.
-
-    Args:
-        port: The port number to check
-        timeout: Maximum time to wait in seconds (default 5.0)
-
-    Raises:
-        TimeoutError: If server doesn't start within the timeout period
-    """
-    start_time = time.time()
-    while time.time() - start_time < timeout:
-        try:
-            with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
-                s.settimeout(0.1)
-                s.connect(("127.0.0.1", port))
-                # Server is ready
-                return
-        except (ConnectionRefusedError, OSError):
-            # Server not ready yet, retry quickly
-            time.sleep(0.01)
-    raise TimeoutError(f"Server on port {port} did not start within {timeout} seconds")  # pragma: no cover