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require_relative '../../spec_helper'
describe "Class#attached_object" do
it "returns the object that is attached to a singleton class" do
a = Class.new
a_obj = a.new
a_obj.singleton_class.attached_object.should == a_obj
end
it "returns the class object that is attached to a class's singleton class" do
a = Class.new
singleton_class = (class << a; self; end)
singleton_class.attached_object.should == a
end
it "raises TypeError if the class is not a singleton class" do
a = Class.new
-> { a.attached_object }.should raise_error(TypeError, /is not a singleton class/)
end
it "raises TypeError for special singleton classes" do
-> { nil.singleton_class.attached_object }.should raise_error(TypeError, /[`']NilClass' is not a singleton class/)
-> { true.singleton_class.attached_object }.should raise_error(TypeError, /[`']TrueClass' is not a singleton class/)
-> { false.singleton_class.attached_object }.should raise_error(TypeError, /[`']FalseClass' is not a singleton class/)
end
end
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