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_gb18030.rb
    path of file: ./repos/ruby-packer/ruby/test/ruby/enc
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
require "test/unit"

class TestGB18030 < Test::Unit::TestCase
  def s(s)
    s.force_encoding("gb18030")
  end

  def test_mbc_enc_len
    assert_equa
    
  def test_left_adjust_char_head
    # C1: 00-2f, 3a-3f, 7f, ff
    # C2: 40-7e, 80
    # C4: 30-39
    # CM: 81-fe
    c1 = "\x2f"
    c2 = "\x40"
    c4 = "\x30"
    cm = "\x81"

    # S_START-c1
    # S_START-c2-S_one_C2-0
    # S_START-c2-S_one_C2-c1
    # S_START-c2-S_one_C2-cm-S_odd_CM_one_CX-c1
    # S_START-c2-S_one_C2-cm-S_odd_CM_one_CX-cm-S_even_CM_one_CX-c1
    # S_START-c2-S_one_C2-cm-S_odd_CM_one_CX-cm-S_even_CM_one_CX-cm-S_odd_CM_one_CX(rec)
    # S_START-c4-S_one_C4-c1
    # S_START-c4-S_one_C4-cm-S_one_CMC4-c1
    # S_START-c4-S_one_C4-cm-S_one_CMC4-c4-S_one_C4_odd_CMC4-c1
    # S_START-c4-S_one_C4-cm-S_one_CMC4-c4-S_one_C4_odd_CMC4-cm-S_even_CMC4-c1
    # S_START-c4-S_one_C4-cm-S_one_CMC4-c4-S_one_C4_odd_CMC4-cm-S_even_CMC4-c4-S_one_C4_even_CMC4-c1
    # S_START-c4-S_one_C4-cm-S_one_CMC4-c4-S_one_C4_odd_CMC4-cm-S_even_CMC4-c4-S_one_C4_even_CMC4-cm-S_odd_CMC4-c1
    # S_START-c4-S_one_C4-cm-S_one_CMC4-c4-S_one_C4_odd_CMC4-cm-S_even_CMC4-c4-S_one_C4_even_CMC4-cm-S_odd_CMC4-c4-S_one_C4_odd_CMC4(rec)
    # S_START-c4-S_one_C4-cm-S_one_CMC4-c4-S_one_C4_odd_CMC4-cm-S_even_CMC4-c4-S_one_C4_even_CMC4-cm-S_odd_CMC4-cm-S_odd_CM_odd_CMC4-c1
    # S_START-c4-S_one_C4-cm-S_one_CMC4-c4-S_one_C4_odd_CMC4-cm-S_even_CMC4-c4-S_one_C4_even_CMC4-cm-S_odd_CMC4-cm-S_odd_CM_odd_CMC4-cm-S_even_CM_odd_CMC4-c1
    # S_START-c4-S_one_C4-cm-S_one_CMC4-c4-S_one_C4_odd_CMC4-cm-S_even_CMC4-c4-S_one_C4_even_CMC4-cm-S_odd_CMC4-cm-S_odd_CM_odd_CMC4-cm-S_even_CM_odd_CMC4-cm-S_odd_CM_odd_CMC4(rec)
    # S_START-c4-S_one_C4-cm-S_one_CMC4-c4-S_one_C4_odd_CMC4-cm-S_even_CMC4-cm-S_odd_CM_even_CMC4-c1
    # S_START-c4-S_one_C4-cm-S_one_CMC4-c4-S_one_C4_odd_CMC4-cm-S_even_CMC4-cm-S_odd_CM_even_CMC4-cm-S_even_CM_even_CMC4-c1
    # S_START-c4-S_one_C4-cm-S_one_CMC4-c4-S_one_C4_odd_CMC4-cm-S_even_CMC4-cm-S_odd_CM_even_CMC4-cm-S_even_CM_even_CMC4-cm-S_odd_CM_even_CMC4(rec)
    # S_START-c4-S_one_C4-cm-S_one_CMC4-cm-S_even_CM_one_CX(rec)
    # S_START-cm-S_one_CM-c1
    # S_START-cm-S_one_CM-c4-S_odd_C4CM-c1
    # S_START-cm-S_one_CM-c4-S_odd_C4CM-cm-S_one_CM_odd_C4CM-c1
    # S_START-cm-S_one_CM-c4-S_odd_C4CM-cm-S_one_CM_odd_C4CM-c4-S_even_C4CM-c1
    # S_START-cm-S_one_CM-c4-S_odd_C4CM-cm-S_one_CM_odd_C4CM-c4-S_even_C4CM-cm-S_one_CM_even_C4CM-c1
    # S_START-cm-S_one_CM-c4-S_odd_C4CM-cm-S_one_CM_odd_C4CM-c4-S_even_C4CM-cm-S_one_CM_even_C4CM-c4-S_odd_C4CM(rec)
    # S_START-cm-S_one_CM-c4-S_odd_C4CM-cm-S_one_CM_odd_C4CM-c4-S_even_C4CM-cm-S_one_CM_even_C4CM-cm-S_even_CM_even_C4CM-c1
    # S_START-cm-S_one_CM-c4-S_odd_C4CM-cm-S_one_CM_odd_C4CM-c4-S_even_C4CM-cm-S_one_CM_even_C4CM-cm-S_even_CM_even_C4CM-cm-S_odd_CM_even_C4CM-c1
    # S_START-cm-S_one_CM-c4-S_odd_C4CM-cm-S_one_CM_odd_C4CM-c4-S_even_C4CM-cm-S_one_CM_even_C4CM-cm-S_even_CM_even_C4CM-cm-S_odd_CM_even_C4CM-cm-S_even_CM_even_C4CM(rec)
    # S_START-cm-S_one_CM-c4-S_odd_C4CM-cm-S_one_CM_odd_C4CM-cm-S_even_CM_odd_C4CM-c1
    # S_START-cm-S_one_CM-c4-S_odd_C4CM-cm-S_one_CM_odd_C4CM-cm-S_even_CM_odd_C4CM-cm-S_odd_CM_odd_C4CM-c1
    # S_START-cm-S_one_CM-c4-S_odd_C4CM-cm-S_one_CM_odd_C4CM-cm-S_even_CM_odd_C4CM-cm-S_odd_CM_odd_C4CM-cm-S_even_CM_odd_C4CM(rec)
    # S_START-cm-S_one_CM-cm-S_odd_CM_one_CX(rec)

    scheck([c1], 1)
    scheck([c2], 1)
    scheck([c2, c1], 1)
    scheck([c2, cm, c1], 2)
    scheck([c2, cm, cm, c1], 1)
    scheck([c2, cm, cm, cm], 2)
    scheck([c4], 1)
    scheck([c4, c1], 1)
    scheck([c4, cm], 2)
    scheck([c4, cm, c1], 2)
    scheck([c4, cm, c4, c1], 2)
    scheck([c4, cm, c4, cm], 4)
    scheck([c4, cm, c4, cm, c1], 4)
    scheck([c4, cm, c4, cm, c4], 4)
    scheck([c4, cm, c4, cm, c4, c1], 4)
    scheck([c4, cm, c4, cm, c4, cm], 2)
    scheck([c4, cm, c4, cm, c4, cm, c1], 2)
    scheck([c4, cm, c4, cm, c4, cm, c4], 2)
    scheck([c4, cm, c4, cm, c4, cm, cm, c1], 4)
    scheck([c4, cm, c4, cm, c4, cm, cm, cm], 2)
    scheck([c4, cm, c4, cm, c4, cm, cm, cm, c1], 2)
    scheck([c4, cm, c4, cm, c4, cm, cm, cm, cm], 4)
    scheck([c4, cm, c4, cm, cm, c1], 2)
    scheck([c4, cm, c4, cm, cm, cm], 4)
    scheck([c4, cm, c4, cm, cm, cm, c1], 4)
    scheck([c4, cm, c4, cm, cm, cm, cm], 2)
    scheck([c4, cm, cm], 1)
    scheck([cm], 1)
    scheck([cm, c1], 1)
    scheck([cm, c4, c1], 1)
    scheck([cm, c4, cm], 3)
    scheck([cm, c4, cm, c1], 3)
    scheck([cm, c4, cm, c4], 3)
    scheck([cm, c4, cm, c4, c1], 3)
    scheck([cm, c4, cm, c4, cm], 1)
    scheck([cm, c4, cm, c4, cm, c1], 1)
    scheck([cm, c4, cm, c4, cm, c4], 1)
    scheck([cm, c4, cm, c4, cm, cm, c1], 3)
    scheck([cm, c4, cm, c4, cm, cm, cm], 1)
    scheck([cm, c4, cm, c4, cm, cm, cm, c1], 1)
    scheck([cm, c4, cm, c4, cm, cm, cm, cm], 3)
    scheck([cm, c4, cm, cm, c1], 1)
    scheck([cm, c4, cm, cm, cm], 3)
    scheck([cm, c4, cm, cm, cm, c1], 3)
    scheck([cm, c4, cm, cm, cm, cm], 1)
    scheck([cm, cm], 2)
  end