This document provides three testing tips: 1) Use SmartFactory to efficiently create test data and populate required fields. SmartFactory looks at metadata to generate objects and autofill fields. 2) Implement interfaces for callout classes to allow mocking callouts for testing. This decouples code and improves testability. 3) Use Automated Testing for Force.com to automatically run tests on code deployments via continuous integration. It sends test results to email to catch bugs early.