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TestToolCallRequestOverride Class — langchain Architecture

Architecture documentation for the TestToolCallRequestOverride class in test_overrides.py from the langchain codebase.

Class python

Entity Profile

Dependency Diagram

graph TD
  fe9405ec_9f76_8e01_a9d8_c9a8313d07fc["TestToolCallRequestOverride"]
  ee49be32_a4ff_96ee_e234_5e8fd8a9500d["test_overrides.py"]
  fe9405ec_9f76_8e01_a9d8_c9a8313d07fc -->|defined in| ee49be32_a4ff_96ee_e234_5e8fd8a9500d
  8eea0c71_9fe8_58cf_3847_30e6704386b1["test_override_tool_call()"]
  fe9405ec_9f76_8e01_a9d8_c9a8313d07fc -->|method| 8eea0c71_9fe8_58cf_3847_30e6704386b1
  3e93ffef_e8cc_f834_3f87_0d185a4cf1b7["test_override_state()"]
  fe9405ec_9f76_8e01_a9d8_c9a8313d07fc -->|method| 3e93ffef_e8cc_f834_3f87_0d185a4cf1b7
  1aa16ba4_6b43_66f6_50ac_245652ee6c4a["test_override_multiple_attributes()"]
  fe9405ec_9f76_8e01_a9d8_c9a8313d07fc -->|method| 1aa16ba4_6b43_66f6_50ac_245652ee6c4a
  bf3eea49_a805_86d7_e025_fec062a4032a["test_override_with_copy_pattern()"]
  fe9405ec_9f76_8e01_a9d8_c9a8313d07fc -->|method| bf3eea49_a805_86d7_e025_fec062a4032a
  f7c7d58e_00b2_ff3a_7d7c_75db373d9868["test_override_preserves_identity()"]
  fe9405ec_9f76_8e01_a9d8_c9a8313d07fc -->|method| f7c7d58e_00b2_ff3a_7d7c_75db373d9868
  fc418b4a_1329_e0ad_827b_6ea3fd4c0169["test_override_chaining()"]
  fe9405ec_9f76_8e01_a9d8_c9a8313d07fc -->|method| fc418b4a_1329_e0ad_827b_6ea3fd4c0169

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_overrides.py lines 256–442

class TestToolCallRequestOverride:
    """Test the ToolCallRequest.override() method."""

    def test_override_tool_call(self) -> None:
        """Test overriding tool_call dict."""

        @tool
        def test_tool(x: int) -> str:
            """A test tool."""
            return f"Result: {x}"

        original_call = ToolCall(name="test_tool", args={"x": 5}, id="1", type="tool_call")
        modified_call = ToolCall(name="test_tool", args={"x": 10}, id="1", type="tool_call")

        original_request = ToolCallRequest(
            tool_call=original_call,
            tool=test_tool,
            state={"messages": []},
            runtime=Mock(),
        )

        new_request = original_request.override(tool_call=modified_call)

        # New request should have modified tool_call
        assert new_request.tool_call["args"]["x"] == 10
        # Original should be unchanged
        assert original_request.tool_call["args"]["x"] == 5
        # Other attributes should be the same
        assert new_request.tool is original_request.tool
        assert new_request.state is original_request.state

    def test_override_state(self) -> None:
        """Test overriding state."""

        @tool
        def test_tool(x: int) -> str:
            """A test tool."""
            return f"Result: {x}"

        tool_call = ToolCall(name="test_tool", args={"x": 5}, id="1", type="tool_call")
        original_state = {"messages": [HumanMessage("Hi")]}
        new_state = {"messages": [HumanMessage("Hi"), AIMessage("Hello")]}

        original_request = ToolCallRequest(
            tool_call=tool_call,
            tool=test_tool,
            state=original_state,
            runtime=Mock(),
        )

        new_request = original_request.override(state=new_state)

        assert len(new_request.state["messages"]) == 2
        assert len(original_request.state["messages"]) == 1

    def test_override_multiple_attributes(self) -> None:
        """Test overriding multiple attributes at once."""

        @tool
        def test_tool(x: int) -> str:
            """A test tool."""
            return f"Result: {x}"

        @tool
        def another_tool(y: str) -> str:
            """Another test tool."""
            return f"Output: {y}"

        original_call = ToolCall(name="test_tool", args={"x": 5}, id="1", type="tool_call")
        modified_call = ToolCall(
            name="another_tool",
            args={"y": "hello"},
            id="2",
            type="tool_call",
        )

        original_request = ToolCallRequest(
            tool_call=original_call,
            tool=test_tool,
            state={"count": 1},
            runtime=Mock(),

Defined In

Source

Frequently Asked Questions

What is the TestToolCallRequestOverride class?
TestToolCallRequestOverride is a class in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_overrides.py.
Where is TestToolCallRequestOverride defined?
TestToolCallRequestOverride is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_overrides.py at line 256.

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