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require 'test/unit'
class TestUndef < Test::Unit::TestCase
class Undef0
def foo
"foo"
end
undef foo
end
class Undef1
def bar
"bar"
end
end
class Undef2 < Undef1
undef bar
end
def test_undef
x = Undef0.new
assert_raise(NoMethodError) { x.foo }
y = Undef1.new
assert_equal "bar", y.bar
z = Undef2.new
assert_raise(NoMethodError) { z.foo }
end
def test_special_const_undef
assert_raise(TypeError) do
1.instance_eval do
undef to_s
end
end
end
end
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