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• everzet on Twitter
• Inviqa
• "Design How Your Objects Talk Through Mocking" presentation
• "Test Driven Development: By Example", by Kent Beck
• "Growing Object Oriented Software Guided By Tests", by Steve Freeman and Nat Pryce
• The "Tell, Don't Ask" principle
• Sandi Metz's "Magic Tricks of Testing" talk
• Ian Cooper's "TDD: Where did it all go wrong?" talk
• Conway's Game of Life
• BDD London Meetup
• Sponsored by Hired