class RSpec::Mocks::ConstantMutator::UndefinedConstantSetter

def mutate
  remaining_parts = @context_parts.dup
  @deepest_defined_const = @context_parts.inject(Object) do |klass, name|
    break klass unless const_defined_on?(klass, name)
    remaining_parts.shift
    get_const_defined_on(klass, name)
  end
  context = remaining_parts.inject(@deepest_defined_const) do |klass, name|
    klass.const_set(name, Module.new)
  end
  @const_to_remove = remaining_parts.first || @const_name
  context.const_set(@const_name, @mutated_value)
end

def rspec_reset
  @deepest_defined_const.__send__(:remove_const, @const_to_remove)
end

def to_constant
  const = super
  const.stubbed = true
  const.previously_defined = false
  const
end