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Stubbing with arguments - examples used in my "(More) Specific Stubbing with RSpec" blog post
class GivesCreditToPreferredCustomers
LOOK_BACK_PERIOD = 3
def self.for_large_orders(sales_amount, added_credit)
# the has_large_purchases scope now takes two arguments
preferred_customers = Customer.has_large_purchases(sales_amount, LOOK_BACK_PERIOD)
preferred_customers.each do |customer|
customer.add_credit added_credit
end
end
end
class Customer
attr_reader :total_credit
def self.has_large_purchases(sales_amount)
puts "AR query to find buyers with large purchases"
end
def add_credit(amount)
@total_credit = 0 if @total_credit.nil?
@total_credit += amount
end
end
describe GivesCreditToPreferredCustomers do
context "for large orders" do
let(:sales_amount) { 10000 }
let(:credit_given) { 100 }
let(:found_customer) { Customer.new }
before do
Customer.stub(:has_large_purchases).and_return [found_customer]
end
it "update's the customer's credit" do
GivesCreditToPreferredCustomers \
.for_large_orders(sales_amount, credit_given)
found_customer.total_credit.should == credit_given
end
it "scans over the past three units" do
look_back_period = 3
# rspec will use the return value from an existing stub, if any
Customer.should_receive(:has_large_purchases).with(sales_amount, look_back_period)
GivesCreditToPreferredCustomers.for_large_orders(sales_amount, credit_given)
do
end
end
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