PriceCalculator_spec.rb

PriceCalculator_spec.rb

require 'spec_helper'

describe FaleMais::PriceCalculator do
  context "#object" do
    it "should be a subclass of Object" do
      Object.constants.should include(:FaleMais)
    end

    it "should be instantiable" do
      FaleMais::PriceCalculator.new.should be_an_instance_of FaleMais::PriceCalculator

    end

    it "should accept options" do
      FaleMais::PriceCalculator.new(:plan => '30').should be_an_instance_of FaleMais::PriceCalculator
    end

    it "should initialize instance variables with options" do
      options = { :plan => '30', :source => '011', :destination => '016' }
      calculator = FaleMais::PriceCalculator.new(options)
      options.keys.map do |key|
        key.to_s.insert(0, '@').to_sym
      end.each do |option|
        calculator.instance_variables.should include option
      end
    end

    it "should be possible to assign variables after it's instantiated" do
      calculator = FaleMais::PriceCalculator.new
      calculator.plan = '30'
      calculator.instance_variables.should include :@plan
    end
  end

  context "#price" do
    before(:each) do
      @options = { :plan => '120', :source => '018', :destination => '011', :time => '200' }
      @calculator = FaleMais::PriceCalculator.new(@options)
    end

    it "should return the correct price per minute" do
      FaleMais::PriceCalculator.minute_pricing('011','016').should == 1.9
    end

    it "should calculate the price" do
      lambda { @calculator.calculate }.should_not raise_error
    end

    it "should yield the right result" do
      @calculator.calculate
      @calculator.price.should be_close 167.20, 0.01
    end

    it "should calculate the price without any plan" do
      @calculator.calculate
      @calculator.price_without_plan.should be_close 380.0, 0.01
    end
  end
end