spec/ruby/core/unboundmethod/bind_call_spec.rb


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require_relative '../../spec_helper'
require_relative 'fixtures/classes'

describe "UnboundMethod#bind_call" 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
    -> { @normal_um.bind_call(UnboundMethodSpecs::B.new) }.should raise_error(TypeError)
  end

  it "binds and calls the method if object is kind_of the Module the method defined in" do
    @normal_um.bind_call(UnboundMethodSpecs::Methods.new).should == true
  end

  it "binds and calls the method on any object when UnboundMethod is unbound from a module" do
    UnboundMethodSpecs::Mod.instance_method(:from_mod).bind_call(Object.new).should == nil
  end

  it "binds and calls the method for any object kind_of? the Module the method is defined in" do
    @parent_um.bind_call(UnboundMethodSpecs::Child1.new).should == nil
    @child1_um.bind_call(UnboundMethodSpecs::Parent.new).should == nil
    @child2_um.bind_call(UnboundMethodSpecs::Child1.new).should == nil
  end

  it "binds and calls a Kernel method retrieved from Object on BasicObject" do
    Object.instance_method(:instance_of?).bind_call(BasicObject.new, BasicObject).should == true
  end

  it "binds and calls a Parent's class method to any Child's class methods" do
    um = UnboundMethodSpecs::Parent.method(:class_method).unbind
    um.bind_call(UnboundMethodSpecs::Child1).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
    ->{ um.bind_call(other) }.should raise_error(TypeError)
  end
end