Test Mode

Recommended model tier: balanced (sonnet) - this skill performs straightforward operations

Write comprehensive tests and run test suites.

Prerequisites

Before starting:

• Identify the code to be tested (function, module, feature)
• Understand the testing framework used in the project

Workflow

Step 1: Check Project Testing Decisions

Use the mcp__plugin_aide_aide__decision_get tool with topic testing to check for testing framework decisions.

Common frameworks by language:

• TypeScript/JavaScript: Vitest, Jest, Mocha
• Go: built-in go test
• Python: pytest, unittest

Step 2: Discover Existing Test Patterns

Use Glob to find test files:

• Pattern: **/*.test.ts, **/*.spec.ts (TypeScript)
• Pattern: **/*_test.go (Go)
• Pattern: **/test_*.py, **/*_test.py (Python)

Use Grep to find test patterns in existing test files:

• Grep pattern="describe\(" include="*.test.*" — find test suites
• Grep pattern="it\(|test\(" include="*.test.*" — find test cases

Read an existing test file to understand:

• Import patterns
• Setup/teardown patterns
• Mocking approach
• Assertion style

Step 3: Analyze Target Code

Use mcp__plugin_aide_aide__code_symbols with the target file path to get function signatures. Use mcp__plugin_aide_aide__code_search to find related types.

Identify:

• Input parameters and types
• Return type
• Side effects
• Dependencies to mock
• Edge cases

Step 4: Write Tests

Follow the project's testing conventions. Cover these scenarios:

Test Categories:

1. Happy path - Normal, expected inputs
2. Edge cases - Empty, null, boundary values
3. Error cases - Invalid inputs, expected failures
4. Async behavior - If applicable

Naming convention:

• Descriptive names that explain what is being tested
• Format: "should [expected behavior] when [condition]"

Step 5: Run Tests

# TypeScript/JavaScript
npm test                    # Run all tests
npm test -- --grep "name"   # Run specific test
npm run test:coverage       # Run with coverage

# Go
go test ./...               # Run all tests
go test -v ./pkg/...        # Verbose output
go test -cover ./...        # With coverage

# Python
pytest                      # Run all tests
pytest -v                   # Verbose
pytest --cov                # With coverage

Step 6: Verify Coverage

# Check coverage report
npm run test:coverage

# Go
go test -coverprofile=coverage.out ./...
go tool cover -html=coverage.out

Coverage targets:

• New code: aim for >80%
• Critical paths: aim for >90%
• Focus on meaningful tests, not just coverage numbers

Failure Handling

Failure	Action
Test imports fail	Check path aliases, ensure test config matches main
Mock not working	Verify mock setup, check dependency injection
Async test timeout	Add proper await, increase timeout if needed
Flaky test	Check for shared state, timing issues, or external deps
Coverage too low	Add edge case tests, error path tests

Test Structure Templates

TypeScript/JavaScript (Vitest/Jest)

import { describe, it, expect, beforeEach, vi } from "vitest";
import { functionToTest } from "./module";

describe("functionToTest", () => {
  beforeEach(() => {
    // Reset state before each test
    vi.clearAllMocks();
  });

  it("should return expected result for valid input", () => {
    const result = functionToTest("valid input");
    expect(result).toBe("expected output");
  });

  it("should handle empty input", () => {
    const result = functionToTest("");
    expect(result).toBe("");
  });

  it("should throw error for null input", () => {
    expect(() => functionToTest(null)).toThrow("Input required");
  });

  it("should handle async operation", async () => {
    const result = await functionToTest("async input");
    expect(result).resolves.toBe("async output");
  });
});

Go

func TestFunctionName(t *testing.T) {
    tests := []struct {
        name    string
        input   string
        want    string
        wantErr bool
    }{
        {"valid input", "input", "expected", false},
        {"empty input", "", "", false},
        {"invalid input", "bad", "", true},
    }

    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            got, err := FunctionName(tt.input)
            if (err != nil) != tt.wantErr {
                t.Errorf("error = %v, wantErr %v", err, tt.wantErr)
                return
            }
            if got != tt.want {
                t.Errorf("got = %v, want %v", got, tt.want)
            }
        })
    }
}

Python

import pytest
from module import function_to_test

class TestFunctionToTest:
    def test_valid_input(self):
        assert function_to_test("input") == "expected"

    def test_empty_input(self):
        assert function_to_test("") == ""

    def test_invalid_input_raises(self):
        with pytest.raises(ValueError):
            function_to_test(None)

    @pytest.fixture
    def mock_dependency(self, mocker):
        return mocker.patch("module.dependency")

MCP Tools

• mcp__plugin_aide_aide__code_search - Find existing tests, patterns, types
• mcp__plugin_aide_aide__code_symbols - Understand function signatures to test
• mcp__plugin_aide_aide__decision_get - Check testing framework decisions

Verification Criteria

Before completing:

• All new tests pass
• Existing tests still pass
• Coverage meets project standards
• Tests are deterministic (not flaky)
• Tests follow project conventions

Output Format

## Tests Added

### Files

- `path/to/file.test.ts` - 5 tests for UserService

### Test Cases

1. should create user with valid data
2. should reject duplicate email
3. should hash password before saving
4. should handle empty name
5. should validate email format

### Coverage

- New code: 92%
- Total project: 84%

### Verification

- All tests: PASS
- No flaky tests observed