```ruby
module Context
  class SharedBehavior < Module
    def self.create_from_behavior(beh)
      mod = self.new
      mod.behavior = beh
      mod
    end
  
    def behavior=(beh)
      @behavior = beh
    end
  
    def behavior
      @behavior
    end
  
    def included(arg)
      @behavior.call
    end
  end
end

class Test::Unit::TestCase
  class << self
    def shared(name, &block)
      case name.class.name
      when "String"
        name = name.to_module_name
      when "Symbol"
        name = name.to_s.to_module_name
      else
        raise ArgumentError, "Provide a String or Symbol as the name of the shared behavior group"
      end
      
      Object.const_set(name, Context::SharedBehavior.create_from_behavior(block))
    end
    
    %w(shared_behavior share_as share_behavior_as shared_examples_for).each {|m| alias_method m, :shared}
    
    def use(shared_name)
      case shared_name.class.name
      when "Context::SharedBehavior", "Module"
        include shared_name
      when "String"
        include Object.const_get(shared_name.to_module_name)
      when "Symbol"
        include Object.const_get(shared_name.to_s.to_module_name)
      else
        raise ArgumentError, "Provide a String or Symbol as the name of the shared behavior group or the module name"
      end
    end
    
    %w(uses it_should_behave_like behaves_like uses_examples_from).each {|m| alias_method m, :use}
  end
end```

Hide shared behavior a little better. Name clashes ftl.
user
```ruby
module Context
  class SharedBehavior < Module
    def self.create_from_behavior(beh)
      mod = self.new
      mod._behavior = beh
      
      mod
    end
  
    def _behavior=(beh)
      @_behavior = beh
    end
  
    def included(arg)
      @_behavior.call
    end
  end
end

class Test::Unit::TestCase
  class << self
    def shared(name, &block)
      case name.class.name
      when "String"
        name = name.to_module_name
      when "Symbol"
        name = name.to_s.to_module_name
      else
        raise ArgumentError, "Provide a String or Symbol as the name of the shared behavior group"
      end
      
      Object.const_set(name, Context::SharedBehavior.create_from_behavior(block))
    end
    
    %w(shared_behavior share_as share_behavior_as shared_examples_for).each {|m| alias_method m, :shared}
    
    def use(shared_name)
      case shared_name.class.name
      when "Context::SharedBehavior", "Module"
        include shared_name
      when "String"
        include Object.const_get(shared_name.to_module_name)
      when "Symbol"
        include Object.const_get(shared_name.to_s.to_module_name)
      else
        raise ArgumentError, "Provide a String or Symbol as the name of the shared behavior group or the module name"
      end
    end
    
    %w(uses it_should_behave_like behaves_like uses_examples_from).each {|m| alias_method m, :use}
  end
end```
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