test.js

const test = require('ava')
const greet = require('./greet')

test('method: greet', t => {
  t.is(typeof greet, 'function', 'greet is a function')
  t.is(greet(), 'Hello, people!', 'greet returns a default name')
  t.is(greet('Raphael Porto'), 'Hello, Raphael Porto!', 'greet returns the name')
})