Amir Barylko gave a presentation on November 25, 2010 about behavior-driven development (BDD) and the Capybara testing tool. BDD focuses on implementing applications by describing desired behaviors from a stakeholder perspective. Capybara is a gem that simplifies integration tests in Ruby by providing finders, matchers, and other methods to interact with views and applications. The presentation covered BDD principles and tools like Cucumber and Gherkin, and provided examples of how to write Capybara steps to test views and behaviors.