spec/ruby/library/delegate/delegator/frozen_spec.rb


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require File.expand_path('../../../../spec_helper', __FILE__)
require File.expand_path('../../fixtures/classes', __FILE__)

describe "Delegator when frozen" do
  before :all do
    @array = [42, :hello]
    @delegate = DelegateSpecs::Delegator.new(@array)
    @delegate.freeze
  end

  it "is still readable" do
    @delegate.should == [42, :hello]
    @delegate.include?("bar").should be_false
  end

  it "is frozen" do
    @delegate.frozen?.should be_true
  end

  it "is not writeable" do
    lambda{ @delegate[0] += 2 }.should raise_error( RuntimeError )
  end

  it "creates a frozen clone" do
    @delegate.clone.frozen?.should be_true
  end

  it "creates an unfrozen dup" do
    @delegate.dup.frozen?.should be_false
  end

  it "causes mutative calls to raise RuntimeError" do
    lambda{ @delegate.__setobj__("hola!") }.should raise_error( RuntimeError )
  end

  it "returns false if only the delegated object is frozen" do
    DelegateSpecs::Delegator.new([1,2,3].freeze).frozen?.should be_false
  end
end