test/ruby/test_frozen.rb


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# frozen_string_literal: false
require 'test/unit'

class TestFrozen < Test::Unit::TestCase
  def test_setting_ivar_on_frozen_obj
    obj = Object.new
    obj.freeze
    assert_raise(FrozenError) { obj.instance_variable_set(:@a, 1) }
  end

  def test_setting_ivar_on_frozen_obj_with_ivars
    obj = Object.new
    obj.instance_variable_set(:@a, 1)
    obj.freeze
    assert_raise(FrozenError) { obj.instance_variable_set(:@b, 1) }
  end

  def test_setting_ivar_on_frozen_string
    str = "str"
    str.freeze
    assert_raise(FrozenError) { str.instance_variable_set(:@a, 1) }
  end

  def test_setting_ivar_on_frozen_string_with_ivars
    str = "str"
    str.instance_variable_set(:@a, 1)
    str.freeze
    assert_raise(FrozenError) { str.instance_variable_set(:@b, 1) }
  end

  def test_setting_ivar_on_frozen_string_with_singleton_class
    str = "str"
    str.singleton_class
    str.freeze
    assert_raise_with_message(FrozenError, "can't modify frozen String: \"str\"") { str.instance_variable_set(:@a, 1) }
  end

  class A
    freeze
  end

  def test_setting_ivar_on_frozen_class
    assert_raise_with_message(FrozenError, "can't modify frozen Class: TestFrozen::A") { A.instance_variable_set(:@a, 1) }
    assert_raise_with_message(FrozenError, "can't modify frozen Class: #<Class:TestFrozen::A>") { A.singleton_class.instance_variable_set(:@a, 1) }
  end
end