require_relative '../../spec_helper' require_relative 'fixtures/classes' describe "UnboundMethod#bind" do before :each do @normal_um = UnboundMethodSpecs::Methods.new.method(:foo).unbind @parent_um = UnboundMethodSpecs::Parent.new.method(:foo).unbind @child1_um = UnboundMethodSpecs::Child1.new.method(:foo).unbind @child2_um = UnboundMethodSpecs::Child2.new.method(:foo).unbind end it "raises TypeError if object is not kind_of? the Module the method defined in" do lambda { @normal_um.bind(UnboundMethodSpecs::B.new) }.should raise_error(TypeError) end it "returns Method for any object that is kind_of? the Module method was extracted from" do @normal_um.bind(UnboundMethodSpecs::Methods.new).should be_kind_of(Method) end it "returns Method on any object when UnboundMethod is unbound from a module" do UnboundMethodSpecs::Mod.instance_method(:from_mod).bind(Object.new).should be_kind_of(Method) end it "returns Method returned for obj is equal to one directly returned by obj.method" do obj = UnboundMethodSpecs::Methods.new @normal_um.bind(obj).should == obj.method(:foo) end it "returns a callable method" do obj = UnboundMethodSpecs::Methods.new @normal_um.bind(obj).call.should == obj.foo end it "binds a Parent's class method to any Child's class methods" do m = UnboundMethodSpecs::Parent.method(:class_method).unbind.bind(UnboundMethodSpecs::Child1) m.should be_an_instance_of(Method) m.call.should == "I am UnboundMethodSpecs::Child1" end it "will raise when binding a an object singleton's method to another object" do other = UnboundMethodSpecs::Parent.new p = UnboundMethodSpecs::Parent.new class << p def singleton_method :single end end um = p.method(:singleton_method).unbind lambda{ um.bind(other) }.should raise_error(TypeError) end end