spec/ruby/core/basicobject/singleton_method_added_spec.rb


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require_relative '../../spec_helper'
require_relative 'fixtures/singleton_method'

describe "BasicObject#singleton_method_added" do
  before :each do
    ScratchPad.clear
  end

  it "is a private method" do
    BasicObject.should have_private_instance_method(:singleton_method_added)
  end

  it "is called when a singleton method is defined on an object" do
    obj = BasicObject.new

    def obj.singleton_method_added(name)
      ScratchPad.record [:singleton_method_added, name]
    end

    def obj.new_singleton_method
    end

    ScratchPad.recorded.should == [:singleton_method_added, :new_singleton_method]
  end

  it "is not called for instance methods" do
    ScratchPad.record []

    Module.new do
      def self.singleton_method_added(name)
        ScratchPad << name
      end

      def new_instance_method
      end
    end

    ScratchPad.recorded.should_not include(:new_instance_method)
  end

  it "is called when a singleton method is defined on a module" do
    class BasicObjectSpecs::SingletonMethod
      def self.new_method_on_self
      end
    end
    ScratchPad.recorded.should == [:singleton_method_added, :new_method_on_self]
  end

  it "is called when a method is defined in the singleton class" do
    class BasicObjectSpecs::SingletonMethod
      class << self
        def new_method_on_singleton
        end
      end
    end
    ScratchPad.recorded.should == [:singleton_method_added, :new_method_on_singleton]
  end

  it "is called when a method is defined with alias_method in the singleton class" do
    class BasicObjectSpecs::SingletonMethod
      class << self
        alias_method :new_method_on_singleton_with_alias_method, :singleton_method_to_alias
      end
    end
    ScratchPad.recorded.should == [:singleton_method_added, :new_method_on_singleton_with_alias_method]
  end

  it "is called when a method is defined with syntax alias in the singleton class" do
    class BasicObjectSpecs::SingletonMethod
      class << self
        alias new_method_on_singleton_with_syntax_alias singleton_method_to_alias
      end
    end
    ScratchPad.recorded.should == [:singleton_method_added, :new_method_on_singleton_with_syntax_alias]
  end

  it "is called when define_method is used in the singleton class" do
    class BasicObjectSpecs::SingletonMethod
      class << self
        define_method :new_method_with_define_method do
        end
      end
    end
    ScratchPad.recorded.should == [:singleton_method_added, :new_method_with_define_method]
  end
end