You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: shared_runner_tests.rb
    path of file: ./repos/kiba/test
    
    the code of the file until where you have to start completion: require "minitest/mock"
require_relative "support/test_enumerable_source"
require_relative "support/test_destination_returning_nil"

module SharedRunnerTests
  def rows
    @rows ||= [
      {identifier: "first-row"},
      {identifier: "second-row"}
    ]
  end

  def control
    @control ||= begin
      control = Kiba::Control.new
      # this will yield a single row for testing
      control.sourc
    
  def test_destination_returning_nil_does_not_remove_row_from_pipeline
    # safeguard to avoid modification on the support code
    assert_nil TestDestinationReturningNil.new.write("FOOBAR")

    destinations = []
    control = Kiba.parse do
      source TestEnumerableSource, [{key: "value"}]
      2.times do
        destination TestDestinationReturningNil, on_init: lambda { |d| destinations << d }
      end
    end
    kiba_run(control)
    2.times do |i|
      assert_equal [{key: "value"}], destinations[i].instance_variable_get(:@written_rows)
    end
  end