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

chapter2/kv-cache/tests/test_negative_size.py

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+"""Regression: negative size must read to EOF, not drop a suffix."""
+import sys
+import types
+from pathlib import Path
+
+
+def _stub():
+    try:
+        import openai  # noqa: F401
+    except ImportError:
+        sys.modules.setdefault("openai", types.ModuleType("openai"))
+        sys.modules["openai"].OpenAI = object
+
+
+_stub()
+
+from agent import LocalFileTools  # noqa: E402
+
+
+def test_negative_size_reads_all(tmp_path: Path):
+    (tmp_path / "a.txt").write_text("a\nb\nc\n", encoding="utf-8")
+    tools = LocalFileTools(str(tmp_path))
+    out = tools.read_file("a.txt", offset=0, size=-1)
+    assert out["success"] is True
+    assert out["content"] == "a\nb\nc\n"
+    assert out["lines_read"] == 3