require 'test/unit'

class TestAlias < Test::Unit::TestCase
  class Alias0
    def foo
      "foo"
    end
  end

  class Alias1 < Alias0
    alias bar foo

    def foo
      "foo+#{super}"
    end
  end

  class Alias2 < Alias1
    alias baz foo
    undef foo
  end

  class Alias3 < Alias2
    def foo
      super
    end

    def bar
      super
    end

    def quux
      super
    end
  end

  def test_alias
    x = Alias2.new
    assert_equal "foo", x.bar
    assert_equal "foo+foo", x.baz
    assert_equal "foo+foo", x.baz   # test_check for cache

    x = Alias3.new
    assert_raise(NoMethodError) { x.foo }
    assert_equal "foo", x.bar
    assert_raise(NoMethodError) { x.quux }
  end
   
  class C
    def m
      $SAFE
    end
  end

  def test_JVN_83768862
    d = lambda {
      $SAFE = 4
      dclass = Class.new(C)
      dclass.send(:alias_method, :mm, :m)
      dclass.new
    }.call
    assert_raise(SecurityError) { d.mm }
  end
end