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

describe "Struct" do
  it "includes Enumerable" do
    Struct.include?(Enumerable).should == true
  end
end

describe "Struct anonymous class instance methods" do
  it "includes Enumerable" do
    StructClasses::Car.include?(Enumerable).should == true
  end

  it "reader method should be a synonym for []" do
    klass = Struct.new(:clock, :radio)
    alarm = klass.new(true)
    alarm.clock.should == alarm[:clock]
    alarm.radio.should == alarm['radio']
  end

  it "reader method should not interfere with undefined methods" do
    car = StructClasses::Car.new('Ford', 'Ranger')
    lambda { car.something_weird }.should raise_error(NoMethodError)
  end

  it "writer method be a synonym for []=" do
    car = StructClasses::Car.new('Ford', 'Ranger')
    car.model.should == 'Ranger'
    car.model = 'F150'
    car.model.should == 'F150'
    car[:model].should == 'F150'
    car['model'].should == 'F150'
    car[1].should == 'F150'
  end
end

describe "Struct subclasses" do
  it "can be subclassed" do
    compact = Class.new StructClasses::Car
    compact.new.class.should == compact
  end
end

```

Improve struct with block tests
user
```ruby
require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)

describe "Struct" do
  it "includes Enumerable" do
    Struct.include?(Enumerable).should == true
  end
  
  it "allows class to be modified via a block" do
    klass = Struct.new(:version) do
      def platform
        :ruby
      end
    end
    instance = klass.new('2.2')
    
    instance.version.should == '2.2'
    instance.platform.should == :ruby
  end
end

describe "Struct anonymous class instance methods" do
  it "includes Enumerable" do
    StructClasses::Car.include?(Enumerable).should == true
  end

  it "reader method should be a synonym for []" do
    klass = Struct.new(:clock, :radio)
    alarm = klass.new(true)
    alarm.clock.should == alarm[:clock]
    alarm.radio.should == alarm['radio']
  end

  it "reader method should not interfere with undefined methods" do
    car = StructClasses::Car.new('Ford', 'Ranger')
    lambda { car.something_weird }.should raise_error(NoMethodError)
  end

  it "writer method be a synonym for []=" do
    car = StructClasses::Car.new('Ford', 'Ranger')
    car.model.should == 'Ranger'
    car.model = 'F150'
    car.model.should == 'F150'
    car[:model].should == 'F150'
    car['model'].should == 'F150'
    car[1].should == 'F150'
  end
end

describe "Struct subclasses" do
  it "can be subclassed" do
    compact = Class.new StructClasses::Car
    compact.new.class.should == compact
  end
end

```
assistant