activesupport/test/core_ext/object/instance_variables_test.rb


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require 'abstract_unit'
require 'active_support/core_ext/object'

class ObjectInstanceVariableTest < ActiveSupport::TestCase
  def setup
    @source, @dest = Object.new, Object.new
    @source.instance_variable_set(:@bar, 'bar')
    @source.instance_variable_set(:@baz, 'baz')
  end

  def test_instance_variable_names
    assert_equal %w(@bar @baz), @source.instance_variable_names.sort
  end

  def test_instance_values
    assert_equal({'bar' => 'bar', 'baz' => 'baz'}, @source.instance_values)
  end

  def test_instance_exec_passes_arguments_to_block
    assert_equal %w(hello goodbye), 'hello'.instance_exec('goodbye') { |v| [self, v] }
  end

  def test_instance_exec_with_frozen_obj
    assert_equal %w(olleh goodbye), 'hello'.freeze.instance_exec('goodbye') { |v| [reverse, v] }
  end

  def test_instance_exec_nested
    assert_equal %w(goodbye olleh bar), 'hello'.instance_exec('goodbye') { |arg|
      [arg] + instance_exec('bar') { |v| [reverse, v] } }
  end
end