“Nullables” are a novel technique for isolating production code from external systems and state. Although they also have production uses, they’re particularly valuable for creating fast, reliable tests. This page connects to you resources for using Nullables in your code.| www.jamesshore.com
Purely functional code makes some things easier to understand: because values don't change, you can call functions and know that only their return value matters—they don't change anything outside themselves. But this makes many real-world applications difficult: how do you write to a database, or to the screen?| www.destroyallsoftware.com
Unit Tests are focused on small parts of a code-base, defined in regular programming tools, and fast. There is disagreement on whether units should be solitary or sociable.| martinfowler.com
Test Doubles avoid non-deterministic errors, but you need Contract Tests to ensure they remain consistent with the real services.| martinfowler.com
