ai-agent-book 精选快照（<2MB 代码与文档，来自 github.com/bojieli/ai-agent-book）

chapter7/elo-leaderboard/tests/test_animation_empty_history.py

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+"""Regression: prepare_animation_data must tolerate empty history."""
+import pandas as pd
+from animation import prepare_animation_data
+
+
+def test_empty_history_returns_empty_frames():
+    df = pd.DataFrame(columns=["date", "model", "rating", "rank", "matches", "wins"])
+    data = prepare_animation_data(df)
+    assert data["frames"] == []
+    assert data["total_frames"] == 0
+    assert data["start_date"] is None