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: implementation_test.rb
    path of file: ./repos/json_api_client/test/unit
    
    the code of the file until where you have to start completion: require 'test_helper'

class ImplementationTest < Minitest::Test

  def test_defaults_on_missing_fields
    stub_request(:get, "http://example.com/articles")
      .to_return
    
  def test_parses_json_api_implementation
    stub_request(:get, "http://example.com/articles")
      .to_return(headers: {content_type: "application/vnd.api+json"}, body: {
        data: [{
          type: "articles",
          id: "1",
          attributes: {
            title: "Rails is Omakase"
          }
        }],
        jsonapi: {
          version: "1.3",
          meta: {
            foo: "bar"
          }
        }
      }.to_json)
    articles = Article.all

    implementation = articles.implementation
    assert_equal("1.3", implementation.version)
    assert_equal("bar", implementation.meta.foo)
  end