activesupport/test/core_ext/module/attr_internal_test.rb


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require "abstract_unit"
require "active_support/core_ext/module/attr_internal"

class AttrInternalTest < ActiveSupport::TestCase
  def setup
    @target = Class.new
    @instance = @target.new
  end

  def test_reader
    assert_nothing_raised { @target.attr_internal_reader :foo }

    assert !@instance.instance_variable_defined?("@_foo")
    assert_raise(NoMethodError) { @instance.foo = 1 }

    @instance.instance_variable_set("@_foo", 1)
    assert_nothing_raised { assert_equal 1, @instance.foo }
  end

  def test_writer
    assert_nothing_raised { @target.attr_internal_writer :foo }

    assert !@instance.instance_variable_defined?("@_foo")
    assert_nothing_raised { assert_equal 1, @instance.foo = 1 }

    assert_equal 1, @instance.instance_variable_get("@_foo")
    assert_raise(NoMethodError) { @instance.foo }
  end

  def test_accessor
    assert_nothing_raised { @target.attr_internal :foo }

    assert !@instance.instance_variable_defined?("@_foo")
    assert_nothing_raised { assert_equal 1, @instance.foo = 1 }

    assert_equal 1, @instance.instance_variable_get("@_foo")
    assert_nothing_raised { assert_equal 1, @instance.foo }
  end

  def test_naming_format
    assert_equal "@_%s", Module.attr_internal_naming_format
    assert_nothing_raised { Module.attr_internal_naming_format = "@abc%sdef" }
    @target.attr_internal :foo

    assert !@instance.instance_variable_defined?("@_foo")
    assert !@instance.instance_variable_defined?("@abcfoodef")
    assert_nothing_raised { @instance.foo = 1 }
    assert !@instance.instance_variable_defined?("@_foo")
    assert @instance.instance_variable_defined?("@abcfoodef")
  ensure
    Module.attr_internal_naming_format = "@_%s"
  end
end