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: then_test.rb
    path of file: ./repos/u-case/test/micro/case
    
    the code of the file until where you have to start completion: require 'test_helper'

class Micro::Case::ThenTest < Minitest::Test
  class Add1 < Micro::Case
    attribute :number

    def call!
      Success result: { number: number + 1 }
    end
  end

  if RUBY_VERSION < '2.5.0'
    def test_the_not_impl
    
  def test_the_invalid_invocation_error
    assert_raises_with_message(
      Micro::Case::Error::InvalidInvocationOfTheThenMethod,
      'Invalid invocation of the Micro::Case.then method'
    ) { Add1.then(1) }

    if RUBY_VERSION >= '2.5.0'
      assert_raises_with_message(
        Micro::Case::Error::InvalidInvocationOfTheThenMethod,
        'Invalid invocation of the Micro::Case.then method'
      ) { Add1.then(1) { 0 } }

      Add1.then { |arg| assert_same(Add1, arg) }
    end