I would rather you use "let" instead of `@auto`. 

Instead of 

```ruby
before :each do
  @auto = Automobile.new(model: 'Mustang', color: 'Red', make: 'Ford', year: 2007)
end
```

I would

```ruby
let(:auto) { Automobile.new(model: 'Mustang', color: 'Red', make: 'Ford', year: 2007) }
```

Then later, 

```ruby
auto.should be_an_instance_of Automobile
```