tool_test.go

Overview

This file contains automated tests for verifying the implementation and interface conformance of various tool components within the system. Specifically, it validates whether different tool implementations comply with the expected internal interfaces defined in the tooling framework. These interfaces represent key behaviors such as request processing and function execution capabilities.

The tests instantiate multiple tool types from different packages, check for errors during creation, and assert that the instantiated tools implement the required interfaces. This ensures that tools are correctly integrated and conform to the internal contracts expected by the system.

Detailed Explanation

Package Declaration

package tool_test

The package tool_test is a test package separate from the main tool package, which allows testing exported APIs without access to unexported internals. This practice helps verify external behavior and interface compliance.

Imports

The test imports various tool implementations and internal tooling interfaces:

• "testing": Provides the Go testing framework.

• "google.golang.org/adk/internal/toolinternal": Contains internal tool interfaces such as FunctionTool and RequestProcessor.

• "google.golang.org/adk/tool": Base tool interface definitions.

• Implementations of tools:

  • functiontool

  • geminitool

  • loadartifactstool

  • agenttool

Test Function: TestTypes

This is the main test function in the file.

func TestTypes(t *testing.T)

• Purpose:
  Verify that different tool implementations fulfill expected internal interface contracts.

• Test Cases:
  An array of structs, each defining:

  • name (string): Identifier for the test case.

  • constructor (func() (tool.Tool, error)): Function to instantiate the tool under test.

  • expectedTypes ([]string): List of strings representing expected interface implementations for that tool.

• Expected Interface Types:

  • "FunctionTool": Indicates the tool should implement the toolinternal.FunctionTool interface.

  • "RequestProcessor": Indicates the tool should implement the toolinternal.RequestProcessor interface.

• Test Logic:

  For each test case:

  1. The tool is instantiated via its constructor.

  2. On error during instantiation, the test fails immediately.

  3. For each expected interface type:

     • Type assertion is performed to check if the tool implements the interface.

     • If the assertion fails, an error is logged describing the missing implementation.

  4. If an unknown interface type string is encountered, the test fails.

Tool Implementations Tested

• FunctionTool:
  Created with functiontool.New(). This tool wraps a Go function and supports function execution capabilities.

• geminitool:
  Created via geminitool.New() or directly using the struct geminitool.GoogleSearch{}. This represents a Gemini-native tool, typically for web search.

• LoadArtifactsTool:
  Created with loadartifactstool.New(). This tool loads artifacts into the session or LLM instructions.

• AgentTool:
  Created with agenttool.New(). This tool wraps sub-agents for delegation and composition.

Usage Examples

tool, err := functiontool.New(functiontool.Config{}, func(tool.Context, int) (int, error) { return 0, nil })
if err != nil {
    // handle error
}

This example creates a FunctionTool instance by passing a configuration and a simple function.

Internal Interfaces Verified

• toolinternal.FunctionTool:
  Interface for tools that represent executable functions callable by agents or LLMs.

• toolinternal.RequestProcessor:
  Interface for tools that can process requests, typically handling messages or commands.

These internal interfaces are part of the core tooling system described in Tooling System.

Implementation Details

• The test uses Go's subtests (t.Run) to isolate each tool test case, providing clear test output per tool.

• The test relies on type assertions to verify interface implementation rather than checking concrete types. This approach ensures compliance with the system's abstraction boundaries.

• The test covers multiple tool packages, ensuring broad integration coverage within the tooling framework.

Interaction with Other System Components

• Tool Interfaces and Implementations:
  This test file validates tools that are part of the modular tooling framework (Tooling System).

• Internal Interfaces:
  The interfaces checked (FunctionTool, RequestProcessor) reside in the internal package toolinternal, which defines core behaviors used by agents and other components.

• Tool Implementations:
  The tested tools (functiontool, geminitool, loadartifactstool, agenttool) provide functionality used by agents to perform various tasks such as function execution, artifact loading, web search, and agent delegation (Agent Tools, Function Tools, Artifact Loading Tool, Google Search Tool).

• Testing Context:
  Ensures tools integrated into agents or workflows correctly implement required contracts for smooth operation in the agent lifecycle (Agent Lifecycle and Callbacks, Agent Invocation Context).

Mermaid Diagram

flowchart TD
A[TestTypes] --> B[FunctionTool Test]
A --> C[GeminiTool Test]
A --> D[LoadArtifactsTool Test]
A --> E[AgentTool Test]
B --> F{Check Interfaces}
C --> F
D --> F
E --> F
F --> G[FunctionTool Interface]
F --> H[RequestProcessor Interface]

This flowchart represents the overall test structure: the TestTypes function runs multiple tool tests, each verifying if the tool implements the expected interfaces (FunctionTool and/or RequestProcessor).