tddworks@terminal ~ %

$ npm test

✗ should build better software (0ms)

✓ should follow TDD principles (2ms)

✓ should make the world better (1ms)

Test Suites: 1 passed, 1 total
Tests: 2 passed, 1 failed, 3 total

Test-Driven
Development

Building reliable open-source software through Red → Green → Refactor cycles. Every test is a promise to make better code.

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Experience the Red-Green-Refactor cycle

calculator.test.js

describe('Calculator', () => {
  it('should add two numbers', () => {
    const result = add(2, 3);
    expect(result).toBe(5);
  });
});

calculator.js

// Write your implementation here
function add(a, b) {
  // TODO: implement

}

Test Output

Waiting for test run...

Every test you write makes software more reliable. Every contribution matters.

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Start with behavior, not implementation

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Simple solutions that work

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Tests protect you from regression