test_getters.rb

# Test all of your attr_readers for any class (RSPEC)

def test_getters object, expected, dont_test=[]
  object.instance_variables.each do |attribute|
    attribute = attribute.to_s and attribute[0] = ''
    unless dont_test.include? attribute
      describe "##{attribute}" do
        it "returns correct #{attribute}" do
          expect(object.send(attribute)).to eq(expected[attribute.to_sym])
        end
      end
    end
  end
end

# Example
args = {
  name: 'item',
  description: 'sweet item',
  price: 2000,
  qty: 60
}

item = Item.new(args)

# Lets say Item has a setter for #on_sale that we don't want to test
# all we have to do is add #on_sale to the dont_test third argument
describe Item, 'getter methods' do
  test_getters(item, args, ['on_sale']) # on_sale won't be tested
end


# The output of the tests should look something like this
Item getter methods
  #name
    returns correct name
  #description
    returns correct description
  #price
    returns correct price
  #qty
    returns correct qty