Добавить основную функциональность загрузки YouTube Shorts с использованием файла сессии и обработкой ошибок

tests/test_runtime.py

@@ -0,0 +1,52 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+
+from yt_shorts_downloader import runtime
+
+
+def test_find_supported_js_runtimes_prefers_deno(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setattr(
+        runtime,
+        "which",
+        lambda executable: "/usr/bin/deno" if executable == "deno" else None,
+    )
+
+    runtimes = runtime.find_supported_js_runtimes()
+
+    assert runtimes == {"deno": {"path": "/usr/bin/deno"}}
+
+
+def test_find_supported_js_runtimes_uses_best_supported_node(
+    monkeypatch: pytest.MonkeyPatch,
+    tmp_path: Path,
+) -> None:
+    first_node = tmp_path / ".nvm" / "versions" / "node" / "v22.1.0" / "bin" / "node"
+    second_node = tmp_path / ".nvm" / "versions" / "node" / "v22.9.0" / "bin" / "node"
+    second_node.parent.mkdir(parents=True)
+    first_node.parent.mkdir(parents=True)
+    first_node.write_text("", encoding="utf-8")
+    second_node.write_text("", encoding="utf-8")
+
+    monkeypatch.setattr(runtime, "which", lambda executable: None)
+    monkeypatch.setattr(Path, "home", lambda: tmp_path)
+    monkeypatch.setattr(
+        runtime,
+        "_probe_executable_version",
+        lambda executable: (22, 9, 0)
+        if executable.endswith("v22.9.0/bin/node")
+        else (22, 1, 0),
+    )
+
+    runtimes = runtime.find_supported_js_runtimes()
+
+    assert runtimes == {"node": {"path": str(second_node.resolve())}}
+
+
+def test_parse_semver_handles_prefixed_versions() -> None:
+    assert runtime._parse_semver("v22.12.1") == (22, 12, 1)
+    assert runtime._parse_semver("node") is None