fix: wait for the Python console runtime on Windows

python/sdk/tests/test_runtime_resolution.py

@@ -2,7 +2,11 @@
 
 from __future__ import annotations
 
+import os
+import subprocess
+import sys
 from pathlib import Path
+from types import SimpleNamespace
 
 import deepseek_harness_runtime as runtime
 import pytest
@@ -129,7 +133,7 @@ def test_python_dsh_command_executes_the_bundled_cli(
     called: dict[str, object] = {}
     monkeypatch.setenv("DSH_HOME", "/explicit/home")
     monkeypatch.setattr(runtime, "resolve_bundled_launch_args", lambda: ("/runtime",))
-    monkeypatch.setattr(runtime.sys, "argv", ["dsh", "plugin", "--profile", "sdk", "list"])
+    monkeypatch.setattr(runtime, "sys", SimpleNamespace(platform="linux", argv=["dsh", "plugin", "--profile", "sdk", "list"]))
 
     def execvpe(file: str, args: tuple[str, ...], env: dict[str, str]) -> None:
         called.update(file=file, args=args, home=env.get("DSH_HOME"))
@@ -143,3 +147,51 @@ def test_python_dsh_command_executes_the_bundled_cli(
         "args": ("/runtime", "plugin", "--profile", "sdk", "list"),
         "home": "/explicit/home",
     }
+
+
+@pytest.mark.parametrize("returncode", [0, 37, 513])
+def test_windows_console_waits_and_forwards_runtime_status(monkeypatch: pytest.MonkeyPatch, returncode: int) -> None:
+    monkeypatch.setenv("DSH_HOME", "/explicit/home")
+    monkeypatch.setattr(runtime, "sys", SimpleNamespace(platform="win32", argv=["dsh", "plugin", "argument with spaces", "中文"]))
+    monkeypatch.setattr(runtime, "resolve_bundled_launch_args", lambda: ("runtime.exe",))
+    called = []
+
+    def run(args: tuple[str, ...], **kwargs: object) -> subprocess.CompletedProcess[str]:
+        called.append((args, kwargs))
+        return subprocess.CompletedProcess(args, returncode)
+
+    def forbidden_exec(*args: object) -> None:
+        pytest.fail("Windows console must wait instead of entering CRT exec")
+
+    monkeypatch.setattr(subprocess, "run", run)
+    monkeypatch.setattr(runtime.os, "execvpe", forbidden_exec)
+    with pytest.raises(SystemExit) as result:
+        main()
+    assert result.value.code == returncode
+    assert called == [(("runtime.exe", "plugin", "argument with spaces", "中文"), {"env": os.environ})]
+
+
+@pytest.mark.parametrize("returncode", [0, 37, pytest.param(513, marks=pytest.mark.skipif(sys.platform != "win32", reason="POSIX truncates process exit codes to eight bits"))])
+def test_windows_console_branch_preserves_real_child_io_and_completion(tmp_path: Path, returncode: int) -> None:
+    child = tmp_path / "child with spaces.py"
+    sentinel = tmp_path / "finished"
+    child.write_text(
+        "import pathlib,sys\n"
+        "assert sys.argv[1] == 'argument with spaces'\n"
+        "assert sys.argv[2] == '中文'\n"
+        "print('stdout-中文', flush=True)\n"
+        "print('stderr-中文', file=sys.stderr, flush=True)\n"
+        f"pathlib.Path({str(sentinel)!r}).write_text('done')\n"
+        f"raise SystemExit({returncode})\n", encoding="utf-8",
+    )
+    driver = (
+        "import deepseek_harness_runtime as runtime; from types import SimpleNamespace; "
+        f"runtime.sys = SimpleNamespace(platform='win32', argv=['dsh', 'argument with spaces', '中文']); "
+        f"runtime.resolve_bundled_launch_args = lambda: ({sys.executable!r}, {str(child)!r}); runtime.main()"
+    )
+    result = subprocess.run([sys.executable, "-c", driver], capture_output=True, text=True, encoding="utf-8",
+                            env={**os.environ, "DSH_HOME": str(tmp_path), "PYTHONIOENCODING": "utf-8"}, timeout=15)
+    assert result.returncode == returncode, result.stderr
+    assert result.stdout == "stdout-中文\n"
+    assert result.stderr == "stderr-中文\n"
+    assert sentinel.read_text() == "done"