Creating a function for buying a car that works the way Steve expects it to. Here are Steve's specifications for an acceptable car to buy:

• The car must have fuel efficiency between 6 and 11 litres/100km
• The car must cost $5,000 or less
• If the car's color is pink, then he will buy it no matter what the price or litres/100km.
• If it's a hatchback, he will not buy it even if it's pink.
• The function should also throw an error if no car is passed in.

1. Install dependencies using the npm install command.
2. Run test with npm test.

• chai
• mocha