Testing WebEngine applications

• Explain the difference between testing business logic, page behaviour, and full request flows.
• Explain why WebEngine’s separation of concerns helps testing.

What and when to test

• Test-driven development is the way in the "perfect world", but sometimes isn't practical.
• Application classes in isolation tested with PHPUnit.
• Page logic behaviour tested with Behat.

Practical test strategy

• Keep unit tests focused on application classes. Try to test all application functionality as it's built.
• Use behavioural tests for page-level integration.
• Avoid over-testing framework or language internals.

Test-driven development

• Explain that this is a discipline, but getting into the habbit genuinely transforms development quality.
• With TDD, nothing the application can do can happen without being tested.
• Confidence in user-critical flows, confidence in data handling and business rules, confidence in rendering of important pages.
• Link to todo list TDD tutorial.

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When you're ready to deploy to production, have a production checklist to hand.