require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)

describe "Method#super_method" do
  it "returns the method that would be called by super in the method" do
    obj = MethodSpecs::C.new
    obj.extend MethodSpecs::OverrideAgain
    meth = obj.method(:overridden)

    s_meth = meth.super_method
    s_meth.owner.should == MethodSpecs::C
    s_meth.receiver.should == obj
    s_meth.name.should == :overridden

    ss_meth = meth.super_method.super_method
    ss_meth.owner.should == MethodSpecs::BetweenBAndC
    ss_meth.receiver.should == obj
    ss_meth.name.should == :overridden

    sss_meth = meth.super_method.super_method.super_method
    sss_meth.owner.should == MethodSpecs::B
    sss_meth.receiver.should == obj
    sss_meth.name.should == :overridden
  end

  it "returns nil when there's no super method in the parent" do
    method = Object.new.method(:method)
    method.super_method.should == nil
  end

  it "returns nil when the parent's method is removed" do
    klass = Class.new do
      def overridden; end
    end
    sub = Class.new(klass) do
      def overridden; end
    end
    object = sub.new
    method = object.method(:overridden)

    klass.class_eval { undef :overridden }

    method.super_method.should == nil
  end
end