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

chapter4/execution-tools/test_command_history_count_zero.py

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+"""get_command_history(count=0) must return an empty list, not the full history."""
+import pytest
+
+from config import Config
+from terminal_controller import TerminalController
+
+
+@pytest.fixture
+def tc(tmp_path, monkeypatch):
+    monkeypatch.setattr(Config, "WORKSPACE_DIR", tmp_path)
+    controller = TerminalController()
+    controller.command_history = ["cmd0", "cmd1", "cmd2", "cmd3", "cmd4"]
+    return controller
+
+
+@pytest.mark.asyncio
+async def test_count_zero_returns_empty_history(tc):
+    result = await tc.get_command_history(count=0)
+    assert result["success"] is True
+    assert result["history"] == []
+    assert result["count"] == 0
+    assert result["total"] == 5
+
+
+@pytest.mark.asyncio
+async def test_positive_count_still_returns_recent(tc):
+    result = await tc.get_command_history(count=2)
+    assert result["success"] is True
+    assert result["history"] == ["cmd3", "cmd4"]
+    assert result["count"] == 2
+    assert result["total"] == 5