Ruby on Rails Interview Question (1)

interview_q1_spec.rb

require 'rspec'

def format_money(amount)
  '-1' #TODO
end

describe "format_money" do
  context "when the amount is a simple fraction" do
    subject{ 0.4 }
    specify{ format_money(subject).should == "$0.40" }
  end

  context "when the amount is a negative fraction" do
    subject{ -0.4 }
    specify{ format_money(subject).should == "-$0.40" }
  end

  context "when the amount is a tricky fraction" do
    subject{ 0.9 / 100 }
    specify{ format_money(subject).should == "$0.009" }
  end

  context "when the amount is a tricky negative fraction" do
    subject{ 0.9 / 100 * -1 }
    specify{ format_money(subject).should == "-$0.009" }
  end
end