activity.rb

class Data

  class << self

    def all
      (1..10).to_a
    end

    def created
      [4, 5, 6, 8, 9]
    end

    def users
      [1, 2, 4, 5, 6]
    end

    def accounts
      [3, 7, 8, 9, 10]
    end

    def updated
      [2, 3, 6, 7, 8, 9, 10]
    end
  end
end

class Activity

  def self.find
    Data.all
  end
end

if __FILE__ == $0

  require 'test/unit'

  class ActivityTest < Test::Unit::TestCase

    def test_one
      assert_equal [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], Activity.find
    end

    def test_two
      assert_equal [4, 5, 6], Activity.find(:indexes => {:type => :users, :action => :created})
    end

    def test_three
      assert_equal [2, 3, 6, 7, 8, 9, 10],
        Activity.find(:indexes => {:type => [:accounts, :users], :action => :updated})
    end

    def test_four
      assert_equal [2, 3, 4, 5, 6, 7, 8, 9, 10],
        Activity.find(:indexes => {:type => [:accounts, :users], :action => [:updated, :created]})
    end

    def test_five
      assert_equal [3, 7, 8, 9, 10],
        Activity.find(:indexes => {:type => :accounts, :action => [:updated, :created]})
    end
  end
end