Functional Testing Courses
SymfonyCasts PHPUnit (Legacy): Testing with a Bite
SymfonyCasts Starting in Symfony2: Course 2 (2.4+)
SymfonyCasts Professional Diploma in Software Testing & Quality Assurance
Udemy Accelerating Tests with Cypress for a Leaderboard Platform - Case Study
NashKnolX via YouTube Test-Driven Drupal: An Introduction to Automated Testing and Test-Driven Development
Drupal Association via YouTube