tdd-workflow

Enforcing test-driven development across unit, integration, and E2E tests requires a workflow that mandates writing tests before code and maintaining 80%+ coverage. This approach ensures validation, regression safety, and quality gates are met for new features and refactors.

Achieving 80%+ test coverage with Playwright E2E testing involves driving cross-layer test coverage from user journeys. You generate test cases first, implement the minimal code to pass them, and repeat validation to cover boundary conditions and error scenarios.

You can use a TDD workflow for bug fixes and refactoring to ensure code safety. It applies disciplined test-driven development principles to these tasks, requiring you to write tests that validate fixes and prevent regressions before altering the implementation.

A strict TDD workflow does require writing tests before implementing code. This ensures requirements are explicit and testable upfront, creating a repeatable process from writing tests to implementing code and refactoring to hit coverage targets.

The limitation of applying TDD to existing software projects is the strict requirement to hit 80%+ coverage across unit, integration, and E2E tests. Achieving this coverage for legacy code demands significant initial effort to write tests for boundary conditions and error scenarios.

To start a TDD workflow for a new feature, you write test cases derived from user journeys first. You then implement the minimal code required to make the tests pass and continuously iterate to improve coverage above 80%.