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35 lines
1004 B
Python
35 lines
1004 B
Python
"""Empty battles JSON array [] must load as an empty battle frame."""
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import json
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from pathlib import Path
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import cli
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def test_load_battles_empty_json_array(tmp_path):
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path = tmp_path / "battles.json"
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path.write_text("[]", encoding="utf-8")
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df = cli._load_battles(str(path))
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assert list(df.columns) == ["model_a", "model_b", "winner"]
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assert len(df) == 0
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def test_load_battles_nonempty_still_requires_columns(tmp_path):
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path = tmp_path / "bad.json"
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path.write_text(json.dumps([{"x": 1}]), encoding="utf-8")
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try:
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cli._load_battles(str(path))
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assert False, "expected ValueError"
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except ValueError as e:
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assert "model_a" in str(e)
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def test_load_battles_normal(tmp_path):
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path = tmp_path / "ok.json"
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path.write_text(
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json.dumps([{"model_a": "A", "model_b": "B", "winner": "model_a"}]),
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encoding="utf-8",
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)
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df = cli._load_battles(str(path))
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assert len(df) == 1
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assert df.iloc[0]["winner"] == "model_a"
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