All Notes

Protecting code against invariant violations by making the wrong thing impossible.

Make the wrong thing impossible.

Tests written without knowledge of the software's internal structure

Khorikov's 4 pillars of good unit tests

A prescripted balance of automated test types

Consistency, availability, and partition tolerance — pick two.

A pattern for structuring unit tests

An automated test which verifies a single unit of behaviour, runs quickly and in isolation

A measure of disorder — the number of possible states a system can be in.

The tendency for codebases to become harder to change as they grow.