refactoring_sales_engine.md

Setup

1. Clone this SalesEngine repo.

• If you already have a directory named sales_engine, you can rename it when you run git clone.

2. Checkout the needs_refactoring branch and bundle.
3. Run the specs with rspec. You should have three passing specs.
4. Take a minute to review what is being tested and how that's happening.
5. Open up lib/customer_repository.rb... This doesn't look so good.

Challenges

The specs should stay green without changing them.

1. Make a private method so we don't need to access @customers_array directly.
2. Refactor the #random method so it's more clear.
3. #find_by_last_name and #find_all_by_first_name are ugly. Make them pretty.
4. #create_customers is doing too much. Split in two methods.
5. This class is doing too much. Split it in two. What code smell do you notice to determine what should be moved?