openfoodnetwork/spec/support/cancan_helper.rb

# From: https://github.com/ryanb/cancan/wiki/Testing-Abilities#rspec

require "cancan/matchers"

module Spree
  RSpec::Matchers.define :have_ability do |ability_hash, options = {}|
    match do |user|
      ability         = Ability.new(user)
      target          = options[:for]
      @ability_result = {}
      ability_hash    = { ability_hash => true } if ability_hash.is_a? Symbol # e.g.: :create => {:create => true}
      ability_hash    = ability_hash.inject({}){ |_, i| _.merge(i => true) } if ability_hash.is_a? Array # e.g.: [:create, :read] => {:create=>true, :read=>true}
      ability_hash.each do |action, _true_or_false|
        @ability_result[action] = ability.can?(action, target)
      end
      ability_hash.diff(@ability_result).none?
    end

    failure_message do |user|
      ability_hash, options = expected
      ability_hash         = { ability_hash => true } if ability_hash.is_a? Symbol # e.g.: :create
      ability_hash         = ability_hash.inject({}){ |_, i| _.merge(i => true) } if ability_hash.is_a? Array # e.g.: [:create, :read] => {:create=>true, :read=>true}
      target               = options[:for]
      message              = "expected User:#{user} to have ability:#{ability_hash} for #{target}, but actual result is #{@ability_result}"
    end

    # to clean up output of RSpec Documentation format
    description do
      target = expected.last[:for]
      "have ability #{ability_hash.keys.join(', ')} for #{target.class.name}"
    end
  end
end