Least Significant Bit

For a week or two I was happily pleased with Jon Lark Larkowski RSpec presentation at Ruby Nation on RSpec syntax, and was eager to use that and other recommendations to improve my specs. Well it was time to test a helper in one of my Rails apps. Check it out, it is sweet.

require 'spec_helper'  # you know everything you need is handled in your spec helper

describe ProfilesHelper do

  # I build myself a class that helps me test my helper
  # and check there is no instance variable here
  let(:profiles_helper) do
    class ProfilesHelperSpecer
      include ProfilesHelper
    end.new
  end

  # describing an instance method
  describe '#custom_company_type?' do
    # in a given context
    context 'with nil company_type' do
      # the subject of the spec
      subject { profiles_helper.custom_company_type?(profile_with_company_type(nil)) }

      # and english readability sweetness
      it { should be_false }
    end

    context 'with blank company_type' do
      subject { profiles_helper.custom_company_type?(profile_with_company_type('')) }

      it { should be_false }
    end

    context 'with company_type == CustomCompanyType constant' do
      subject do
        profiles_helper.
          custom_company_type?(profile_with_company_type(Profile::CustomCompanyType))
      end

      it { should be_true }
    end

    context 'with company_type == any other string' do
      subject do
        profiles_helper.custom_company_type?(profile_with_company_type("any string"))
      end

      it { should be_true }
    end
  end
end

for the sake os completeness, here is the helper you see used above

# spec/support/helpers.rb
require 'ostruct'

def profile_with_company_type(company_type)
  OpenStruct.new :company_type => company_type
end

yes, really => lovely