TDD Command

Implement the following using strict test-driven development: $ARGUMENTS

TDD Cycle (MANDATORY)

RED → GREEN → REFACTOR → REPEAT

1. RED: Write a failing test FIRST
2. GREEN: Write minimal code to pass the test
3. REFACTOR: Improve code while keeping tests green
4. REPEAT: Continue until feature complete

Your Task

Step 1: Define Interfaces (SCAFFOLD)

• Define TypeScript interfaces for inputs/outputs
• Create function signature with throw new Error('Not implemented')

Step 2: Write Failing Tests (RED)

• Write tests that exercise the interface
• Include happy path, edge cases, and error conditions
• Run tests - verify they FAIL

Step 3: Implement Minimal Code (GREEN)

• Write just enough code to make tests pass
• No premature optimization
• Run tests - verify they PASS

Step 4: Refactor (IMPROVE)

• Extract constants, improve naming
• Remove duplication
• Run tests - verify they still PASS

Step 5: Check Coverage

• Target: 80% minimum
• 100% for critical business logic
• Add more tests if needed

Coverage Requirements

Test Types to Include

• Unit Tests: Individual functions
• Edge Cases: Empty, null, max values, boundaries
• Error Conditions: Invalid inputs, network failures
• Integration Tests: API endpoints, database operations

MANDATORY: Tests must be written BEFORE implementation. Never skip the RED phase.