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Ruby/Rails: class_eval doesn't want to evaluate this code
def provides_mocks_for(*providers)
    providers.each do |provider|
      class_eval %Q{
        OmniAuth.config.add_mock(provider, {
          :uid => '123456',
          :provider => provider,
          :nickname => 'nickname',
          :info => {
            'email' => "#{provider}@webs.com",
            'name' => 'full_name_' + provider
          }
        })
      }
    end
  end

provides_mocks_for :facebook, :twitter, :github, :meetup

3.1.3/lib/active_support/core_ext/kernel/singleton_class.rb:11:in `class_eval': can't create instance of singleton class (TypeError)

class Foo
  %w[foo bar].each do |name|
    self.class_eval <<-RUBY, __FILE__, __LINE__ + 1
      def #{name}
        puts '#{name}'
      end
    RUBY
  end
end

class Foo
  %w[foo bar].each do |name|
    define_method name do
      puts name
    end
  end
end