test-driven-development

Write test first, watch it fail, then write minimal code to pass.

• Test-Driven Development (TDD) approach
• Write test before implementation code
• Ensures tests verify real behavior
• Fails first, passes later, refactors after

• NO PRODUCTION CODE WITHOUT A FAILING TEST FIRST
• Write failing test first, then minimal code to pass
• Red-Green-Refactor cycle: red → green → refactor
• Tests must show intent and behavior, not implementation
• Mandatory to verify test fails and passes
• No exceptions: delete and rewrite if code written first

1. 1.Write a failing test that shows desired behavior
2. 2.Verify it fails correctly (no errors, correct failure)
3. 3.Write minimal code to pass the test
4. 4.Verify it passes and no other tests break
5. 5.Refactor only after green, keep tests green
6. 6.Repeat for next feature