TDD + E2E + EDD Expert Workflow

TDD Decision Tree (not the textbook version)

When to RED-GREEN-REFACTOR vs When NOT To

New feature?
  -> Write User Journey FIRST ("As a [role], I want [action], so that [benefit]")
  -> Derive test cases from journey, NOT from implementation plan
  -> One behavior per test, NOT one function per test

Bug fix?
  -> Write FAILING test that reproduces the bug BEFORE touching code
  -> The test IS the bug report; if you can't write the test, you don't understand the bug