require 'spec_helper'

describe 'substitute_for' do

  context "returns true iff api methods and inherited methods match exactly to the other object's methods. Examples:" do
    context "a surrogate with no api methods" do
      let(:surrogate) { Surrogate.endow Class.new }

      example "is substitutable for a class with no methods" do
        surrogate.should substitute_for Class.new
      end

      example "is not substitutable for a class with instance methods" do
        surrogate.should_not substitute_for Class.new { def foo()end }
      end

      example "is not substitutable for a class with class methods" do
        surrogate.should_not substitute_for Class.new { def self.foo()end }
      end

      example "is not substitutable for a class with inherited instance methods" do
        parent = Class.new { def foo()end }
        surrogate.should_not substitute_for Class.new(parent)
      end

      example "is not substitutable for a class with inherited class methods" do
        parent = Class.new { def self.foo()end }
        surrogate.should_not substitute_for Class.new(parent)
      end
    end


    context "a surrogate with an instance level api method" do
      let(:surrogate) { Class.new { Surrogate.endow self; define :foo } }

      example "is substitutable for a class with the same method" do
        surrogate.should substitute_for Class.new { def foo()end }
      end

      example "is substitutable for a class that inherits the method" do
        parent = Class.new { def foo()end }
        surrogate.should substitute_for Class.new(parent)
      end

      example "is not substitutable for a class without the method" do
        surrogate.should_not substitute_for Class.new
      end

      example "is not substitutable for a class with a different method" do
        surrogate.should_not substitute_for Class.new { def bar()end }
      end

      example "is not substitutable for a class with additional methods" do
        other = Class.new { def foo()end; def bar()end }
        surrogate.should_not substitute_for other
      end

      example "is not substitutable for a class with the method and inerited additional methods" do
        parent = Class.new { def bar()end }
        surrogate.should_not substitute_for Class.new(parent) { def foo()end }
      end

      example "is not substitutable for a class with the method and additional class methods" do
        surrogate.should_not substitute_for Class.new { def foo()end; def self.bar()end }
      end

      example "is not substitutable for a class with the method and inherited additional class methods" do
        parent = Class.new { def self.bar()end }
        surrogate.should_not substitute_for Class.new(parent) { def foo()end }
      end
    end
  end
end