add new download_test_assets.py script

tests/assets/.gitignore

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+video

tests/assets/download_test_assets.py

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+"""
+Downloads test assets used by tests.
+
+Usage:
+    pixi run python ./tests/assets/download_assets.py
+"""
+
+from __future__ import annotations
+
+import os
+from pathlib import Path
+from typing import Final
+
+import requests
+import tqdm
+
+test_assets = ["video/Big_Buck_Bunny_1080_10s_av1.mp4"]
+
+test_asset_base_url = "https://storage.googleapis.com/rerun-test-assets/"
+
+
+def download_file(url: str, dst_file_path: Path) -> None:
+    """Download file from url to dst_fpath."""
+    dst_file_path.parent.mkdir(parents=True, exist_ok=True)
+    print(f"Downloading {url} to {dst_file_path}")
+    response = requests.get(url, stream=True)
+    with tqdm.tqdm.wrapattr(
+        open(dst_file_path, "wb"),
+        "write",
+        miniters=1,
+        total=int(response.headers.get("content-length", 0)),
+        desc=f"Downloading {dst_file_path.name}",
+    ) as f:
+        for chunk in response.iter_content(chunk_size=4096):
+            f.write(chunk)
+
+
+def main() -> None:
+    """Downloads all test assets."""
+
+    test_asset_dir: Final = Path(os.path.dirname(__file__))
+
+    for asset in test_assets:
+        target_file = test_asset_dir / asset
+        if not target_file.exists():
+            download_file(test_asset_base_url + asset, target_file)
+        else:
+            print(f'Skipping "{asset}" because it already exists.')
+
+
+if __name__ == "__main__":
+    main()