Thinking about testing can help with good overall design. Consider: - How can I build a small, testable unit that can be combined with other small, testable un

Thinking about testing can help with good overall design. Consider: - How can I build a small, testable unit that can be combined with other small, testable units? - How can I design a small, testable unit with a stable interface? - How can I test this small testable unit in isolation and in various production/deployment scenarios? Choosing the right building blocks to focus on meshes well with testing thinking b/c it lends itself to a bottom-up philosophy.