tool_test.go

Overview

This file contains unit tests for the geminitool package, specifically targeting the functionality of the GeminiTool type's request processing capabilities. It validates the behavior of the ProcessRequest method, which adds Gemini-native tool configurations (like Google Search) to the LLM request payloads. The tests ensure that the tool is correctly appended to the LLM request's tool list under various scenarios, including empty requests, requests with pre-existing tools, and error cases such as a nil request.

The file primarily focuses on correctness of request augmentation, verifying that the GeminiTool complies with the internal RequestProcessor interface and modifies the LLM request as expected.

Detailed Explanation

Test Function: TestGeminiTool_ProcessRequest

func TestGeminiTool_ProcessRequest(t *testing.T)

• Purpose:
  Validates the ProcessRequest method of the GeminiTool implementation, checking if it properly adds a Gemini Tool to the LLM request's tool list.

• Parameters:

  • t *testing.T: Standard Go testing framework parameter for managing test state and reporting.

• Test Cases:
  The test iterates over a set of subtests defined in testCases, covering these scenarios:

  1. Add to Empty Request:

     • Input: A genai.Tool with a GoogleSearch tool configured.

     • Request: An empty model.LLMRequest without any tools.

     • Expectation: The tool list in the request after processing should contain the single GoogleSearch tool.

  2. Add to Existing Tools:

     • Input: A genai.Tool with a GoogleSearch tool.

     • Request: An LLMRequest with a pre-existing tool, GoogleMaps.

     • Expectation: The resulting tool list should contain both the original GoogleMaps tool and the newly added GoogleSearch tool, preserving order.

  3. Error on Nil Request:

     • Input: Not specified (nil tool).

     • Request: nil passed as the LLM request.

     • Expectation: The method should return an error, as the request is invalid.

• Test Steps:
  For each case:

  • Instantiate a GeminiTool with a dummy name and the input tool.

  • Assert that this instance implements the toolinternal.RequestProcessor interface.

  • Call ProcessRequest on the GeminiTool with the test case's LLM request.

  • Check if an error was expected and assert accordingly.

  • If no error is expected, compare the resulting request's tool list with the expected tool list using cmp.Diff.

  • Report failures if the tool list differs or errors do not match expectations.

• Return Value:
  None (standard Go test function). Uses assertions and t.Fatalf / t.Errorf to signal test failures.

• Usage Example:
  This test is run automatically as part of go test for the geminitool package. It ensures that any changes to the tool request augmentation logic maintain backward compatibility and correctness.

Important Implementation Details

• The test verifies that GeminiTool implements the toolinternal.RequestProcessor interface, which requires a ProcessRequest method. This confirms integration with the internal tooling framework responsible for modifying LLM requests.

• The ProcessRequest method adds the tool to the Tools slice inside the LLMRequest's Config (GenerateContentConfig). The test validates that this addition is correct and does not overwrite existing tools.

• Error handling is tested explicitly by passing a nil request, ensuring robustness against invalid inputs.

• The test uses the go-cmp package to perform deep comparisons of tool slices, which is critical for ensuring structural equivalency rather than shallow equality.

Interaction with Other Components

• geminitool Package:
  The file tests the core behavior of the GeminiTool type within the geminitool package. This package implements Gemini-native tools that are integrated into LLM requests.

• toolinternal.RequestProcessor Interface:
  The test confirms that GeminiTool implements this interface from the internal tooling package. This interface defines the contract for processing LLM requests by adding or modifying tools.

• model.LLMRequest Struct:
  The request object that holds configuration for LLM generation, including the list of tools available to the Gemini model during generation. The test manipulates this structure to verify tool inclusion.

• genai.Tool and Subtypes:
  The Gemini API representations of tools such as GoogleSearch and GoogleMaps. This test uses these to simulate real-world tools that agents might add to their LLM requests.

• Testing Frameworks:
  Uses Go's built-in testing package and go-cmp for structural comparison, enabling precise validation of request content after processing.

Diagram: Functional Flow of TestGeminiTool_ProcessRequest

flowchart TD
start([Start Test])
subtests[Iterate Test Cases]
createTool[Create GeminiTool instance]
checkInterface[Assert implements RequestProcessor]
callProcess[Call ProcessRequest]
checkError[Check error matches expectation]
checkTools[Compare request tools with expected]
reportFailError[Report error mismatch]
reportFailTools[Report tool list mismatch]
end([End Test])
start --> subtests
subtests --> createTool
createTool --> checkInterface
checkInterface -->|fail| reportFailError
checkInterface --> callProcess
callProcess --> checkError
checkError -->|mismatch| reportFailError
checkError -->|match| checkTools
checkTools -->|mismatch| reportFailTools
checkTools -->|match| subtests
reportFailError --> end
reportFailTools --> end
subtests --> end

This flowchart illustrates the testing workflow for each test case, from creation of the GeminiTool instance, interface assertion, invocation of ProcessRequest, error checking, tool list verification, to reporting failures or proceeding to the next test case.

References to Related Topics

• The GeminiTool tested here builds on the Gemini-native capability of adding tools such as the Google Search Tool to LLM generation requests. This relates directly to the handling of real-time web search integration within agent workflows.

• The interface toolinternal.RequestProcessor belongs to the internal tooling framework described under the Tooling System, which defines how tools interact with agents and LLM requests.

• The model.LLMRequest struct and related configurations are part of the request processing paradigm in the LLM Integration and Agents topic, which covers how agents compose requests with tools and instructions.

• The testing methodology here ensures that the agent framework components properly compose tool configurations, linking to the broader Agent Lifecycle and Callbacks and Agent Workflow Management where tools influence agent behavior.

End of documentation for tool_test.go