refactor(e2e): unify RouterInstance into Gateway class, split conftest.py into modular fixtures (#16671)

sgl-model-gateway/e2e_test/fixtures/markers.py

@@ -0,0 +1,57 @@
+"""Marker helper utilities for E2E tests.
+
+This module provides helper functions for extracting values from pytest markers.
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+import pytest
+
+
+def get_marker_value(
+    request: pytest.FixtureRequest,
+    marker_name: str,
+    arg_index: int = 0,
+    default: Any = None,
+) -> Any:
+    """Get a value from a pytest marker.
+
+    Args:
+        request: The pytest fixture request.
+        marker_name: Name of the marker to look for.
+        arg_index: Index of positional argument to extract.
+        default: Default value if marker not found.
+
+    Returns:
+        The marker argument value or default.
+    """
+    marker = request.node.get_closest_marker(marker_name)
+    if marker is None:
+        return default
+    if marker.args and len(marker.args) > arg_index:
+        return marker.args[arg_index]
+    return default
+
+
+def get_marker_kwargs(
+    request: pytest.FixtureRequest,
+    marker_name: str,
+    defaults: dict[str, Any] | None = None,
+) -> dict[str, Any]:
+    """Get keyword arguments from a pytest marker.
+
+    Args:
+        request: The pytest fixture request.
+        marker_name: Name of the marker to look for.
+        defaults: Default values if marker not found or missing kwargs.
+
+    Returns:
+        Dict of keyword arguments merged with defaults.
+    """
+    result = dict(defaults) if defaults else {}
+    marker = request.node.get_closest_marker(marker_name)
+    if marker is not None:
+        result.update(marker.kwargs)
+    return result