require_relative '../../spec_helper' describe "Kernel#singleton_method" do it "find a method defined on the singleton class" do obj = Object.new def obj.foo; end obj.singleton_method(:foo).should be_an_instance_of(Method) end it "returns a Method which can be called" do obj = Object.new def obj.foo; 42; end obj.singleton_method(:foo).call.should == 42 end it "only looks at singleton methods and not at methods in the class" do klass = Class.new do def foo 42 end end obj = klass.new obj.foo.should == 42 -> { obj.singleton_method(:foo) }.should raise_error(NameError) { |e| # a NameError and not a NoMethodError e.class.should == NameError } end it "raises a NameError if there is no such method" do obj = Object.new -> { obj.singleton_method(:not_existing) }.should raise_error(NameError) { |e| # a NameError and not a NoMethodError e.class.should == NameError } end end