I guess the question is why not? This is a method that doesn't need to know the state of the object. So putting it as a class method makes more sense to me (but I have very limited knowledge). 

Also I was beign lazy. Below I think was literally the first test I wrote:

```ruby
it 'splits the line' do
expect(SudokuReader.parse_line('...')).to eq [...]
end
```

No need to instantiate anything. What do you think? Was I being too lazy?