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_error_handling.py

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+#!/usr/bin/env python3
+"""Offline regressions for local tool error handling."""
+
+from agent import LocalFileTools
+
+def test_error_handling():
+    """Test that local tools return structured errors instead of raising."""
+
+    print("🧪 Testing Error Handling in Tool Execution")
+    print("="*60)
+
+    # Test local tools directly first
+    print("\n1️⃣ Testing direct tool error handling:")
+    tools = LocalFileTools(root_dir="../..")
+
+    # Test with invalid arguments
+    print("   Testing read_file with extra 'limit' parameter...")
+    # The tool should ignore the extra parameter
+    result = tools.read_file("chapter1/context/README.md")
+    print(f"   Result: {'✓ Success' if result.get('success') else '✗ Error'}")
+    assert result.get("success") is True
+
+    # Test with non-existent file
+    print("   Testing read_file with non-existent file...")
+    result = tools.read_file("non_existent_file.txt")
+    print(f"   Result: {'✓ Error handled' if not result.get('success') else '✗ Unexpected success'}")
+    print(f"   Error message: {result.get('error', 'N/A')}")
+    assert result.get("success") is False
+    assert "File not found" in result.get("error", "")
+
+    # Test security boundary
+    print("   Testing security boundary...")
+    result = tools.read_file("../../../../etc/passwd")
+    print(f"   Result: {'✓ Access denied' if 'Access denied' in result.get('error', '') else '✗ Security issue'}")
+    assert result.get("success") is False
+    assert "Access denied" in result.get("error", "")
+
+    print("\n" + "="*60)
+    print("✅ Error handling test complete!")
+    print("\nKey findings:")
+    print("  • Tools return errors as results instead of throwing exceptions")
+    print("  • Unexpected arguments are filtered out safely")
+    print("  • Security boundaries are enforced")
+
+if __name__ == "__main__":
+    test_error_handling()