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: redis_connection_test.rb
    path of file: ./repos/sidekiq/test
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative "helper"
require "sidekiq/redis_connection"
require "sidekiq/capsule"

describe Sidekiq::RedisConnection do
  describe "create" do
    before do
      @config =
    
    def with_env_var(var, uri, skip_provider = false)
      vars = ["REDISTOGO_URL", "REDIS_PROVIDER", "REDIS_URL"] - [var]
      vars.each do |v|
        next if skip_provider
        ENV[v] = nil
      end
      ENV[var] = uri
      assert_equal uri, Sidekiq::RedisConnection.__send__(:determine_redis_provider)
      ENV[var] = nil
    end