Refactor code structure for improved readability and maintainability

tests/test_cli.py

@@ -14,7 +14,12 @@ def test_cli_prints_downloaded_path(
     tmp_path: Path,
 ) -> None:
     expected_path = tmp_path / "video.mp4"
-    monkeypatch.setattr(cli, "download", lambda **kwargs: expected_path)
+
+    def fake_download_to_path(**kwargs: object) -> Path:
+        del kwargs
+        return expected_path
+
+    monkeypatch.setattr(cli, "download_to_path", fake_download_to_path)
 
     exit_code = cli.main(
         [
@@ -33,9 +38,10 @@ def test_cli_prints_downloaded_path(
 
 def test_cli_exits_with_error(monkeypatch: pytest.MonkeyPatch) -> None:
     def raise_error(**kwargs: object) -> Path:
+        del kwargs
         raise InvalidSessionError("session error")
 
-    monkeypatch.setattr(cli, "download", raise_error)
+    monkeypatch.setattr(cli, "download_to_path", raise_error)
 
     with pytest.raises(SystemExit) as exc_info:
         cli.main(["https://youtube.com/shorts/example", "cookies.txt"])