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

  def test_alias
    x = Alias2.new
    assert_equal("foo", x.bar)
    assert_equal("foo+foo", x.baz)

    # test_check for cache
    assert_equal("foo+foo", x.baz)

    x = Alias3.new
    assert(!x.foo)
    assert(x.bar)
    assert(!x.quux)
  end
end
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<div class='path'>path: <a href='/ruby.git/log/?h=v1_8_6_19&amp;id=b93e2223300bc54dfa387ffb9fa3d48ecbe670f0'>root</a>/<a href='/ruby.git/log/tool?h=v1_8_6_19&amp;id=b93e2223300bc54dfa387ffb9fa3d48ecbe670f0'>tool</a>/<a href='/ruby.git/log/tool/m4?h=v1_8_6_19&amp;id=b93e2223300bc54dfa387ffb9fa3d48ecbe670f0'>m4</a>/<a href='/ruby.git/log/tool/m4/ruby_rm_recursive.m4?h=v1_8_6_19&amp;id=b93e2223300bc54dfa387ffb9fa3d48ecbe670f0'>ruby_rm_recursive.m4</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/ruby.git/log/tool/m4/ruby_rm_recursive.m4?h=v1_8_6_19&amp;id=b93e2223300bc54dfa387ffb9fa3d48ecbe670f0&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-04-17 19:14:21 +0900'>2021-04-17</span></td><td><a href='/ruby.git/commit/tool/m4/ruby_rm_recursive.m4?h=v1_8_6_19&amp;id=1f56238032482ab55db2a7cbf5c156b5ccc17526'>Remove comments in tool/m4 from the generated configure</a></td><td>Nobuyoshi Nakada</td></tr>
<tr><td><span title='2020-12-13 01:16:57 +0900'>2020-12-13</span></td><td><a href='/ruby.git/commit/tool/m4/ruby_rm_recursive.m4?h=v1_8_6_19&amp;id=3b7c05ef8dc15371316e5254d33af12928183971'>Fixed RUBY_RM_RECURSIVE when autoconf met the required version</a></td><td>Nobuyoshi Nakada</td></tr>
<tr><td><span title='2018-01-20 07:14:59 +0000'>2018-01-20</span></td><td><a href='/ruby.git/commit/tool/m4/ruby_rm_recursive.m4?h=v1_8_6_19&amp;id=583939602838ad9d39e8485df4c8a8e5f236b608'>Emacs friendliness [ci skip]</a></td><td>shyouhei</td></tr>
<tr><td><span title='2018-01-20 07:05:25 +0000'>2018-01-20</span></td><td><a href='/ruby.git/commit/tool/m4/ruby_rm_recursive.m4?h=v1_8_6_19&amp;id=0664a6377a7fc51e6d96d7b69361cc457e248b00'>refactor split configure.ac into files</a></td><td>shyouhei</td></tr>