Send an SMS When Your Build Fails on Travis CI

This tutorial demonstrates the implementation of Test-Driven Development (TDD) and Continuous Integration using Travis CI. It guides users through building a small Lumen project, writing tests, and setting up a webhook to send notifications via Twilio SMS when the build fails. The process involves creating a test-driven development environment, writing tests for the user controller, setting up the database, configuring seeded data, and integrating with Travis CI. The tutorial concludes by testing the webhook and receiving an SMS notification when the build fails.