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tdd-guide

Skill18 starsChanged 5 months agoMITView on GitHub

Test-driven development workflow with test generation, coverage analysis, and multi-framework support

6 other projects use a version of this, 6 of them edited.

Adopted by

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The file

We split this skill into the rules it gives an agent

7 rules. 4 are common, 0 are distinctive, and 3 are very specific to this project.

  • 4

    Common

    Most of the 6 edited versions we read keep these.

  • 0

    Distinctive

    This author's own choices. Worth a look.

  • 3

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Common:

    Test-driven development skill for generating tests, analyzing coverage, and guiding red-green-refactor workflows across Jest, Pytest, …

    line 21
  2. Very specific:

    Run test_generator.py with requirements

    line 52
  3. Very specific:

    Run coverage_analyzer.py on LCOV/JSON/XML report

    line 59
  4. Common:

    Write failing test first (RED)

    line 66
  5. Very specific:

    Run tdd_workflow.py --phase red to validate

    line 67
  6. Common:

    Validation: All tests pass after each cycle

    line 71
  7. Common:

    Test code and implementation status

    line 105

“Common” is measured: kept by at least 6 in 10 of the 6 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

TDD Guide

Test-driven development skill for generating tests, analyzing coverage, and guiding red-green-refactor workflows across Jest, Pytest, JUnit, and Vitest.

Table of Contents

  • Capabilities
  • Workflows
  • Tools
  • Input Requirements
  • Limitations

Capabilities

CapabilityDescription
Test GenerationConvert requirements or code into test cases with proper structure
Coverage AnalysisParse LCOV/JSON/XML reports, identify gaps, prioritize fixes
TDD WorkflowGuide red-green-refactor cycles with validation
Framework AdaptersGenerate tests for Jest, Pytest, JUnit, Vitest, Mocha
Quality ScoringAssess test isolation, assertions, naming, detect test smells
Fixture GenerationCreate realistic test data, mocks, and factories

Workflows

Generate Tests from Code

  1. Provide source code (TypeScript, JavaScript, Python, Java)
  2. Specify target framework (Jest, Pytest, JUnit, Vitest)
  3. Run test_generator.py with requirements
  4. Review generated test stubs
  5. Validation: Tests compile and cover happy path, error cases, edge cases

Analyze Coverage Gaps

  1. Generate coverage report from test runner (npm test -- --coverage)
  2. Run coverage_analyzer.py on LCOV/JSON/XML report
  3. Review prioritized gaps (P0/P1/P2)
  4. Generate missing tests for uncovered paths
  5. Validation: Coverage meets target threshold (typically 80%+)

TDD New Feature

  1. Write failing test first (RED)
  2. Run tdd_workflow.py --phase red to validate
  3. Implement minimal code to pass (GREEN)
  4. Run tdd_workflow.py --phase green to validate
  5. Refactor while keeping tests green (REFACTOR)
  6. Validation: All tests pass after each cycle

Tools

ToolPurposeUsage
test_generator.pyGenerate test cases from code/requirementspython scripts/test_generator.py --input source.py --framework pytest
coverage_analyzer.pyParse and analyze coverage reportspython scripts/coverage_analyzer.py --report lcov.info --threshold 80
tdd_workflow.pyGuide red-green-refactor cyclespython scripts/tdd_workflow.py --phase red --test test_auth.py
framework_adapter.pyConvert tests between frameworkspython scripts/framework_adapter.py --from jest --to pytest
fixture_generator.pyGenerate test data and mockspython scripts/fixture_generator.py --entity User --count 5
metrics_calculator.pyCalculate test quality metricspython scripts/metrics_calculator.py --tests tests/
format_detector.pyDetect language and frameworkpython scripts/format_detector.py --file source.ts
output_formatter.pyFormat output for CLI/desktop/CIpython scripts/output_formatter.py --format markdown

Input Requirements

For Test Generation:

  • Source code (file path or pasted content)
  • Target framework (Jest, Pytest, JUnit, Vitest)
  • Coverage scope (unit, integration, edge cases)

For Coverage Analysis:

  • Coverage report file (LCOV, JSON, or XML format)
  • Optional: Source code for context
  • Optional: Target threshold percentage

For TDD Workflow:

  • Feature requirements or user story
  • Current phase (RED, GREEN, REFACTOR)
  • Test code and implementation status

Limitations

ScopeDetails
Unit test focusIntegration and E2E tests require different patterns
Static analysisCannot execute tests or measure runtime behavior
Language supportBest for TypeScript, JavaScript, Python, Java
Report formatsLCOV, JSON, XML only; other formats need conversion
Generated testsProvide scaffolding; require human review for complex logic

When to use other tools:

  • E2E testing: Playwright, Cypress, Selenium
  • Performance testing: k6, JMeter, Locust
  • Security testing: OWASP ZAP, Burp Suite

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