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: dir.rb
    path of file: ./repos/truffleruby/lib/gems/gems/test-unit-3.5.7/lib/test/unit/collector
    
    the code of the file until where you have to start completion: require 'test/unit/testsuite'
require 'test/unit/collector'

module Test
  module Unit
    module Collector
      class Dir
        include Collector

        attr_reader :pattern, :exclude
        attr_accessor :base

        def initialize(dir=::Dir, file=::File, object_space=::ObjectSpace, req=nil)
          super()
          @dir = dir
  
    
        def collect(*from)
          basedir = @base
          $:.push(basedir) if basedir
          if(from.empty?)
            suite = recursive_collect('.', find_test_cases)
          elsif(from.size == 1)
            suite = recursive_collect(from.first, find_test_cases)
          else
            suites = []
            from.each do |f|
              suite = recursive_collect(f, find_test_cases)
              suites << suite unless(suite.tests.empty?)
            end
            suite = TestSuite.new("[#{from.join(', ')}]")
            sort(suites).each{|s| suite << s}
            suite
          end