python: deepseek-harness SDK and runtime carrier packages

python/sdk/tests/test_runtime_resolution.py

@@ -0,0 +1,43 @@
+"""Keyless tests for the deepseek_harness_runtime resolution API.
+
+These never launch a runtime, so they run everywhere regardless of which
+bundled artifacts are present; the launch-and-boot coverage lives in
+``test_bundled_runtime.py``.
+"""
+
+from __future__ import annotations
+
+import pytest
+
+from deepseek_harness_runtime import (
+    RUNTIME_MODE_ENV_VAR,
+    bundled_default_config_path,
+    bundled_package_dir,
+    resolve_bundled_launch_args,
+)
+
+
+def test_default_config_is_shipped_with_the_package() -> None:
+    path = bundled_default_config_path()
+    assert path == bundled_package_dir() / "runtime" / "cordis.yml"
+    assert "@deepseek-ai/dsh-agent-core" in path.read_text()
+
+
+def test_unknown_explicit_mode_fails_loud() -> None:
+    with pytest.raises(ValueError, match="expected 'exe' or 'node'"):
+        resolve_bundled_launch_args("bogus")
+
+
+def test_unknown_env_mode_fails_loud(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setenv(RUNTIME_MODE_ENV_VAR, "bogus")
+    with pytest.raises(ValueError, match="expected 'exe' or 'node'"):
+        resolve_bundled_launch_args()
+
+
+def test_explicit_mode_wins_over_env_mode(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setenv(RUNTIME_MODE_ENV_VAR, "bogus")
+    try:
+        args = resolve_bundled_launch_args("exe")
+    except FileNotFoundError:
+        return  # explicit 'exe' was honored; only the artifact is missing
+    assert args[0].endswith(("-x64", "-arm64"))