polyglot-test-agent

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Generates comprehensive, workable unit tests for any programming language using a multi-agent pipeline. Use when asked to generate tests, write unit tests, improve test coverage, add test coverage, create test files, or test a codebase. Supports C#, TypeScript, JavaScript, Python, Go, Rust, Java, and more. Orchestrates research, planning, and implementation phases to produce tests that compile, pass, and follow project conventions.

16installs

Sourcegithub/awesome-copilot

Added on2026-02-19

NPX Install

npx skill4agent add github/awesome-copilot polyglot-test-agent

SKILL.md Content

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Polyglot Test Generation Skill

An AI-powered skill that generates comprehensive, workable unit tests for any programming language using a coordinated multi-agent pipeline.

When to Use This Skill

Use this skill when you need to:

Generate unit tests for an entire project or specific files
Improve test coverage for existing codebases
Create test files that follow project conventions
Write tests that actually compile and pass
Add tests for new features or untested code

How It Works

This skill coordinates multiple specialized agents in a Research → Plan → Implement pipeline:

Pipeline Overview

┌─────────────────────────────────────────────────────────────┐
│                     TEST GENERATOR                          │
│  Coordinates the full pipeline and manages state            │
└─────────────────────┬───────────────────────────────────────┘
                      │
        ┌─────────────┼─────────────┐
        ▼             ▼             ▼
┌───────────┐  ┌───────────┐  ┌───────────────┐
│ RESEARCHER│  │  PLANNER  │  │  IMPLEMENTER  │
│           │  │           │  │               │
│ Analyzes  │  │ Creates   │  │ Writes tests  │
│ codebase  │→ │ phased    │→ │ per phase     │
│           │  │ plan      │  │               │
└───────────┘  └───────────┘  └───────┬───────┘
                                      │
                    ┌─────────┬───────┼───────────┐
                    ▼         ▼       ▼           ▼
              ┌─────────┐ ┌───────┐ ┌───────┐ ┌───────┐
              │ BUILDER │ │TESTER │ │ FIXER │ │LINTER │
              │         │ │       │ │       │ │       │
              │ Compiles│ │ Runs  │ │ Fixes │ │Formats│
              │ code    │ │ tests │ │ errors│ │ code  │
              └─────────┘ └───────┘ └───────┘ └───────┘

Step-by-Step Instructions

Step 1: Determine the User Request

Make sure you understand what user is asking and for what scope. When the user does not express strong requirements for test style, coverage goals, or conventions, source the guidelines from unit-test-generation.prompt.md. This prompt provides best practices for discovering conventions, parameterization strategies, coverage goals (aim for 80%), and language-specific patterns.

Step 2: Invoke the Test Generator

Start by calling the

polyglot-test-generator

agent with your test generation request:

Generate unit tests for [path or description of what to test], following the [unit-test-generation.prompt.md](unit-test-generation.prompt.md) guidelines

The Test Generator will manage the entire pipeline automatically.

Step 3: Research Phase (Automatic)

The

polyglot-test-researcher

agent analyzes your codebase to understand:

Language & Framework: Detects C#, TypeScript, Python, Go, Rust, Java, etc.
Testing Framework: Identifies MSTest, xUnit, Jest, pytest, go test, etc.
Project Structure: Maps source files, existing tests, and dependencies
Build Commands: Discovers how to build and test the project

Output:

.testagent/research.md

Step 4: Planning Phase (Automatic)

The

polyglot-test-planner

agent creates a structured implementation plan:

Groups files into logical phases (2-5 phases typical)
Prioritizes by complexity and dependencies
Specifies test cases for each file
Defines success criteria per phase

Output:

.testagent/plan.md

Step 5: Implementation Phase (Automatic)

The

polyglot-test-implementer

agent executes each phase sequentially:

Read source files to understand the API
Write test files following project patterns
Build using the
```
polyglot-test-builder
```
subagent to verify compilation
Test using the
```
polyglot-test-tester
```
subagent to verify tests pass
Fix using the
```
polyglot-test-fixer
```
subagent if errors occur
Lint using the
```
polyglot-test-linter
```
subagent for code formatting

Each phase completes before the next begins, ensuring incremental progress.

Coverage Types

Happy path: Valid inputs produce expected outputs
Edge cases: Empty values, boundaries, special characters
Error cases: Invalid inputs, null handling, exceptions

State Management

All pipeline state is stored in

.testagent/

folder:

File	Purpose
`.testagent/research.md`	Codebase analysis results
`.testagent/plan.md`	Phased implementation plan
`.testagent/status.md`	Progress tracking (optional)

Examples

Example 1: Full Project Testing

Generate unit tests for my Calculator project at C:\src\Calculator

Example 2: Specific File Testing

Generate unit tests for src/services/UserService.ts

Example 3: Targeted Coverage

Add tests for the authentication module with focus on edge cases

Agent Reference

Agent	Purpose	Tools
`polyglot-test-generator`	Coordinates pipeline	runCommands, codebase, editFiles, search, runSubagent
`polyglot-test-researcher`	Analyzes codebase	runCommands, codebase, editFiles, search, fetch, runSubagent
`polyglot-test-planner`	Creates test plan	codebase, editFiles, search, runSubagent
`polyglot-test-implementer`	Writes test files	runCommands, codebase, editFiles, search, runSubagent
`polyglot-test-builder`	Compiles code	runCommands, codebase, search
`polyglot-test-tester`	Runs tests	runCommands, codebase, search
`polyglot-test-fixer`	Fixes errors	runCommands, codebase, editFiles, search
`polyglot-test-linter`	Formats code	runCommands, codebase, search

Requirements

Project must have a build/test system configured
Testing framework should be installed (or installable)
VS Code with GitHub Copilot extension

Troubleshooting

Tests don't compile

The

polyglot-test-fixer

agent will attempt to resolve compilation errors. Check

.testagent/plan.md

for the expected test structure.

Tests fail

Review the test output and adjust test expectations. Some tests may require mocking dependencies.

Wrong testing framework detected

Specify your preferred framework in the initial request: "Generate Jest tests for..."