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_spell_checker.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/test/did_you_mean
    
    the code of the file until where you have to start completion: require_relative './helper'

class SpellCheckerTest < Test::Unit::TestCase
  def test_spell_checker_corrects_mistypes
    assert_spell 'foo',   input: 'doo',   dictionary: ['foo', 'fork']
    assert_spell 'email', input: 'meail', dictionary: ['email', 'fail', 'eval']
    assert_spell 'fail',  input: 'fial',  dictionary: ['email', 'fail', 'eval']
    assert_spell 'fail',  input: 'afil',  dictionary: ['email', 'fail', 'eval']
    assert_spell 'eval',  input: 'eavl',  dictionary: ['email', 'fail', 'eval']
    assert_spell 'eval',  input: 'veal',  dictionary: ['email', 'fail', 'eval']
    assert_spell 'sub!',  input: 'suv!',  dictionary: ['sub', 'gsub', 'sub!']
    assert_spell 'sub',   input: 'suv',   dictionary: ['sub', 'gsub', 'sub!']
    assert_spell 'Foo',   input: 'FOo',   dictionary: ['Foo', 'FOo']

    assert_spell %w(gsub! gsub),     input: 'gsuv!', dictionary: %w(sub gsub gsub!)
    assert_spell %w(sub! sub gsub!), input: 'ssub!', dictionary: %w(sub sub! gsub gsub!)

    group_methods = %w(groups group_url groups_url group_path)
    assert_spell 'groups', input: 'group',  dictionary: group_methods

    group_classes = %w(
      GroupMembership
      GroupMembershipPolicy
      GroupMembershipDecorator
      GroupMembershipSerializer
      GroupHelper
      Group
      GroupMailer
      NullGroupMembership
    )

    assert_spell 'GroupMembership',          dictionary: group_classes, input: 'GroupMemberhip'
    assert_spell 'GroupMembers
    
  def test_spell_checker_corrects_mistypes
    assert_spell 'foo',   input: 'doo',   dictionary: ['foo', 'fork']
    assert_spell 'email', input: 'meail', dictionary: ['email', 'fail', 'eval']
    assert_spell 'fail',  input: 'fial',  dictionary: ['email', 'fail', 'eval']
    assert_spell 'fail',  input: 'afil',  dictionary: ['email', 'fail', 'eval']
    assert_spell 'eval',  input: 'eavl',  dictionary: ['email', 'fail', 'eval']
    assert_spell 'eval',  input: 'veal',  dictionary: ['email', 'fail', 'eval']
    assert_spell 'sub!',  input: 'suv!',  dictionary: ['sub', 'gsub', 'sub!']
    assert_spell 'sub',   input: 'suv',   dictionary: ['sub', 'gsub', 'sub!']
    assert_spell 'Foo',   input: 'FOo',   dictionary: ['Foo', 'FOo']

    assert_spell %w(gsub! gsub),     input: 'gsuv!', dictionary: %w(sub gsub gsub!)
    assert_spell %w(sub! sub gsub!), input: 'ssub!', dictionary: %w(sub sub! gsub gsub!)

    group_methods = %w(groups group_url groups_url group_path)
    assert_spell 'groups', input: 'group',  dictionary: group_methods

    group_classes = %w(
      GroupMembership
      GroupMembershipPolicy
      GroupMembershipDecorator
      GroupMembershipSerializer
      GroupHelper
      Group
      GroupMailer
      NullGroupMembership
    )

    assert_spell 'GroupMembership',          dictionary: group_classes, input: 'GroupMemberhip'
    assert_spell 'GroupMembershipDecorator', dictionary: group_classes, input: 'GroupMemberhipDecorator'

    names = %w(first_name_change first_name_changed? first_name_will_change!)
    assert_spell names, input: 'first_name_change!', dictionary: names

    assert_empty DidYouMean::SpellChecker.new(dictionary: ['proc']).correct('product_path')
    assert_empty DidYouMean::SpellChecker.new(dictionary: ['fork']).correct('fooo')
  end