Bad example of not enough test

whoLikeThis.js

// whoLikeThis.js

const whoLikeThis = (names) => {
  return `${names[0]} and ${names.length - 1} others liked this`;
};


// whoLikeThis.test.js

it('should return the first person name and count of the rest`, () => {
  const output = whoLikeThis(['Sarah', 'Michael', 'Jane']);
  
  expect(output).toEqual('Sarach and 2 others liked this');
});