test/ruby/test_undef.rb


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38

# frozen_string_literal: false
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.bar }
  end

  def test_special_const_undef
    assert_raise(TypeError) do
      1.instance_eval do
        undef to_s
      end
    end
  end
end