method.rb

# Ruby Challenge
# 
# Access the original method signature of a class's
# instance method after a module has been prepended
# into that class

require 'minitest/autorun'

module A
  def foo
    'module foo'
  end
end

class B
  def foo
    'class foo'
  end
end

B.send(:prepend, A)

B.new.foo
# => 'module foo'
# This is expected

# I would like to access the raw method from the B class itself
# but because A is prepended anytime I try to access the method
# directly from the ancestor list I always get the module version:

class MethodTest < Minitest::Test
  def test_confirm_prepend
    assert_equal 'module foo', B.new.foo
  end

  def test_ancestor_access
    method = B.ancestors[1].instance_method(:foo)
    method = method.bind(B.new)

    assert_equal 'class foo', method.call
  end
end