require 'test_helper'

require 'has_parent'

require 'mocha'



class HasParentTest < ActiveSupport::TestCase

  def setup

    @parent = mock

    @child = MockObject.new @parent

    @grandchild = MockChild.new @child

  end



  test 'Class does not get parent method until is_child_to is called on it' do

    cls = Class.new MockBaseClass

    parent = @parent

    cls.send(:define_method, :get_parent) { parent }



    instance = cls.new



    assert_raise(NoMethodError) { instance.parent }



    cls.is_child_to :get_parent



    assert_nothing_raised do

      assert_same @parent, instance.parent

    end

  end



  test '@parent is parent of @child' do

    assert_same @parent, @child.parent

    assert_same @child, @grandchild.parent

  end



  test 'is_child_to throws exception when called more than once' do

    assert_raise(ArgumentError) { @child.class.is_child_to :something_else }

  end

end



class MockBaseClass

  include ActsCrummy::HasParent

end



class MockObject < MockBaseClass

  def initialize par

    @mock_parent = par

  end



  is_child_to :mock_parent



  attr_accessor :mock_parent

end



# need another class to test that the class variable being used gets

# applied to the inheriting class, not to the class it's going to

# inherit from (i.e. we want it to belong to the model class, not

# the parent ActiveRecord::Base)

class MockChild < MockBaseClass

  def initialize par

    @my_mock_parent = par

  end

  

  is_child_to :my_mock_parent



  attr_accessor :my_mock_parent

end