beginner-testing

Introduce test-driven development to beginners using Flask and Sinatra test examples.

Updated Mar 30, 2026

Search Tags:#testing #tdd #education #pytest #flask #beginner #sinatra

Ready to run

npx skills add https://github.com/rubrical-works/idpf-praxis-skills --skill beginner-testing-rubrical-works

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: beginner-testing
Source: https://github.com/rubrical-works/idpf-praxis-skills/tree/main/Skills/beginner-testing
Command: npx skills add https://github.com/rubrical-works/idpf-praxis-skills --skill beginner-testing-rubrical-works

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Beginners who have built working Flask or Sinatra apps often have no tests and no idea where to start, leaving them manually clicking through pages to verify every change. This Skill teaches testing fundamentals and the TDD cycle (RED-GREEN-REFACTOR) with simple, runnable examples. ## Core Features & Use Cases - Beginner-Friendly TDD Explanation: Breaks down the RED-GREEN-REFACTOR cycle with plain-language analogies and step-by-step walkthroughs. - Complete Working Examples: Provides full pytest examples for Flask and minitest/rack-test examples for Sinatra covering routes, forms, and database operations. - Use Case: A user has built a notes app with 3-4 features and asks "How do I know if my code works?" The Skill guides them to write their first route test, run it, and progress through a full TDD feature iteration. ## Quick Start Ask the assistant to help you write your first test for your Flask or Sinatra app and explain the TDD cycle.

Frequently Asked Questions about beginner-testing

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I write my first test for a Flask app?▼

Use pytest with Flask's test client to visit routes and assert on responses. Create a test file, call app.test_client().get('/') and assert the status code equals 200, then run pytest from the command line.

How do I test a Sinatra app with minitest?▼

Use minitest with rack-test by including Rack::Test::Methods in your test class and defining an app method returning Sinatra::Application. Then call get or post helpers and assert on last_response.ok? or response body content.

What is the RED-GREEN-REFACTOR cycle in TDD?▼

RED means writing a failing test for a feature that does not exist yet. GREEN means writing the minimum code to make that test pass. REFACTOR means cleaning up the code while keeping all tests passing.

What should beginners test first in a web app?▼

Start with route tests that verify pages return status 200 instead of 404. Then test form submissions, database saves, and that data displays correctly, leaving edge cases and error handling for later.

Why do my tests fail with a 404 status code?▼

A 404 in a test means the route does not exist in your application yet. In TDD this is the expected RED phase, so write the route handler in your app and rerun the test to reach GREEN.