How should I test Rails Enums?

Question

Suppose I have a model called CreditCard. Due to some technical restrictions, it's best if the card networks are represented as an enum. My code looks something like this:

class CreditCard < ActiveRecord::Base
   enum network: [:visa, :mastercard, :amex]
end

What should be tested when using enums if anything?

Answer 1

According to Rails doc for Enum every value of the array correspond to an integer. I'm guessing you want to test that the network array always keeps its same order. If you're using rspec, you can do something like:

describe 'CreditCard' do
  let(:network_values) do
    { visa: 0,
      master: 1
      # etc
    }
  end
  subject { described_class.new }

  it 'has valid a network' do 
    network_values.each do |type, value|
      subject.network = value
      subject.save 
      expect(subject.network).to eql(type.to_s)
    end 
  end 
end 

ps: I'm writing from my mobile phone maybe you'll need some tweaking to run