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: block_header_test.rb
    path of file: ./repos/ruby-ethereum/test
    
    the code of the file until where you have to start completion: # -*- encoding : ascii-8bit -*-

require 'test_helper'

class BlockHeaderTest < Minitest::Test
  include Ethereum

  def test_initial
    
  def test_initialize
    h = BlockHeader.new(bloom: 100, nonce: "ffffffff")
    assert_equal Utils.keccak256_rlp([]), h.uncles_hash
    assert_equal 100, h.bloom
    assert_equal Env::DEFAULT_CONFIG[:genesis_difficulty], h.difficulty
    assert_equal Env::DEFAULT_CONFIG[:genesis_gas_limit], h.gas_limit
    assert_equal "ffffffff", h.nonce
  end