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_pathname.rb
    path of file: ./repos/jruby/test/mri/pathname
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require 'test/unit'
require 'pathname'

require 'fileutils'
require 'tmpdir'


class TestPathname < Test::Unit::TestCase
  def self.define_assertion(name, linenum, &block)
    name = "test_#{name}_#{linenum}"
    define_method(name, &block)
  end

  def self.get_linenum
    if loc = caller_locations(2, 1)
      loc[0].lineno
    else

    
  def test_join
    r = Pathname("a").join(Pathname("b"), Pathname("c"))
    assert_equal(Pathname("a/b/c"), r)
    r = Pathname("/a").join(Pathname("b"), Pathname("c"))
    assert_equal(Pathname("/a/b/c"), r)
    r = Pathname("/a").join(Pathname("/b"), Pathname("c"))
    assert_equal(Pathname("/b/c"), r)
    r = Pathname("/a").join(Pathname("/b"), Pathname("/c"))
    assert_equal(Pathname("/c"), r)
    r = Pathname("/a").join("/b", "/c")
    assert_equal(Pathname("/c"), r)
    r = Pathname("/foo/var").join()
    assert_equal(Pathname("/foo/var"), r)
  end