class RSpec::Core::SharedExampleGroupModule

group.
eval’d when the ‘SharedExampleGroupModule` instance is included in an example
The functionality is defined by the provided block, which is lazily
Represents some functionality that is shared with multiple example groups.

def include_in(klass, inclusion_line, args, customization_block)

Other tags:
    Private: - 
def include_in(klass, inclusion_line, args, customization_block)
  klass.update_inherited_metadata(@metadata) unless @metadata.empty?
  SharedExampleGroupInclusionStackFrame.with_frame(@description, inclusion_line) do
    klass.class_exec(*args, &@definition)
    klass.class_exec(&customization_block) if customization_block
  end
end

def included(klass)

including example group.
Our definition evaluates the shared group block in the context of the
Ruby callback for when a module is included in another module is class. 
def included(klass)
  inclusion_line = klass.metadata[:location]
  include_in klass, inclusion_line, [], nil
end

def initialize(description, definition, metadata) 

def initialize(description, definition, metadata)
  @description = description
  @definition  = definition
  @metadata    = metadata
end

def inspect

Provides a human-readable representation of this module. 
def inspect
  "#<#{self.class.name} #{@description.inspect}>"
end