square software engineer spec example

gistfile1.rb

class Payment
  attr_accessor :amount

  def initialize (x)
    self.amount = amount
  end

  def fee_amount
    (((2.9 * (self.amount * 100)) / 100) + 15).round.to_f/100
  end

end

# actual rspec bit below

describe Payment, "#fee_amount" do
  it "returns 2.9% of $10 + $0.15 ($0.44)" do
    payment = Payment.new(10.00)
    payment.fee_amount.should == 0.44
  end
  it "returns 2.9% of $42 + $0.15 ($1.37)" do
    payment = Payment.new(42.00)
    payment.fee_amount.should == 1.37
  end
end