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: test_kdf.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/test/openssl
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require_relative 'utils'

if defined?(OpenSSL)

class OpenSSL::TestKDF < OpenSSL::TestCase
  def test_pkcs5_pbkdf2_hmac_compatibility
    expected = OpenSSL::KDF.pbkdf2_hma
    
  def test_pbkdf2_hmac_sha256_c_20000_len_32
    #unfortunately no official test vectors available yet for SHA-2
    p ="password"
    s = OpenSSL::Random.random_bytes(16)
    c = 20000
    dk_len = 32
    value1 = OpenSSL::KDF.pbkdf2_hmac(p, salt: s, iterations: c, length: dk_len, hash: "sha256")
    value2 = OpenSSL::KDF.pbkdf2_hmac(p, salt: s, iterations: c, length: dk_len, hash: "sha256")
    assert_equal(value1, value2)
  end