require_relative '../spec_helper' describe "The undef keyword" do describe "undefines a method" do before :each do @undef_class = Class.new do def meth(o); o; end end @obj = @undef_class.new @obj.meth(5).should == 5 end it "with an identifier" do @undef_class.class_eval do undef meth end -> { @obj.meth(5) }.should raise_error(NoMethodError) end it "with a simple symbol" do @undef_class.class_eval do undef :meth end -> { @obj.meth(5) }.should raise_error(NoMethodError) end it "with a single quoted symbol" do @undef_class.class_eval do undef :'meth' end -> { @obj.meth(5) }.should raise_error(NoMethodError) end it "with a double quoted symbol" do @undef_class.class_eval do undef :"meth" end -> { @obj.meth(5) }.should raise_error(NoMethodError) end it "with a interpolated symbol" do @undef_class.class_eval do undef :"#{'meth'}" end -> { @obj.meth(5) }.should raise_error(NoMethodError) end end it "allows undefining multiple methods at a time" do undef_multiple = Class.new do def method1; end def method2; :nope; end undef :method1, :method2 end obj = undef_multiple.new obj.respond_to?(:method1).should == false obj.respond_to?(:method2).should == false end it "raises a NameError when passed a missing name" do Class.new do -> { undef not_exist }.should raise_error(NameError) { |e| # a NameError and not a NoMethodError e.class.should == NameError } end end end