ruby--ruby/test/ruby/test_alias.rb

require 'test/unit'

$KCODE = 'none'

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
      defined? super
    end
    def bar
      defined? super
    end
    def quux
      defined? super
    end
  end

  def test_alias
    x = Alias2.new
    assert(x.bar == "foo")
    assert(x.baz == "foo+foo")
    
    # test_check for cache
    assert(x.baz == "foo+foo")
    
    x = Alias3.new
    assert(!x.foo)
    assert(x.bar)
    assert(!x.quux)
  end
end