generate categories controller
describe GET #index tests for categories controller
test for populates an array of categories in alphabetical order
add routes for categories
create index action in categories controller
create index view for categories
Write index code for categories controller
Test code for rendering categories index
Test code for assign requested category to @category
show action for categories
show view for categories
create set_category method for find category by id
test for renders show template for categories
change select option from add a new business test in business controller
use default category in test for add new business
test for assigns new category to @category
create new action for categories
create new view for categories
create action for categories with category_params
test to render new template for categories