How to test a Controller Concern in Rails 4

Question

What is the best way to handle testing of concerns when used in Rails 4 controllers? Say I have a trivial concern Citations.

module Citations
    ex         


        

Answer 1

I am using a simpler way to test my controller concerns, not sure if this is the correct way but seemed much simpler that the above and makes sense to me, its kind of using the scope of your included controllers. Please let me know if there are any issues with this method. sample controller:

class MyController < BaseController
  include MyConcern

  def index
    ...

    type = column_type(column_name)
    ...
  end

end

my controller concern:

module MyConcern
  ...
  def column_type(name)
    return :phone if (column =~ /phone/).present?
    return :id if column == 'id' || (column =~ /_id/).present?
   :default
  end
  ...

end

spec test for concern:

require 'spec_helper'

describe SearchFilter do
  let(:ac)    { MyController.new }
  context '#column_type' do
    it 'should return :phone for phone type column' do
      expect(ac.column_type('phone')).to eq(:phone)
    end

    it 'should return :id for id column' do
      expect(ac.column_type('company_id')).to eq(:id)
    end

    it 'should return :id for id column' do
      expect(ac.column_type('id')).to eq(:id)
    end

    it 'should return :default for other types of columns' do
      expect(ac.column_type('company_name')).to eq(:default)
    end
  end
end