Update to ruby/spec@c1b568b

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62656 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/library/stringio/append_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#<< when passed [Object]" do
   before :each do

spec/ruby/library/stringio/binmode_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#binmode" do
   it "returns self" do

spec/ruby/library/stringio/bytes_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require 'stringio'
-require File.expand_path('../shared/each_byte', __FILE__)
+require_relative 'shared/each_byte'
 
 describe "StringIO#bytes" do
   it_behaves_like :stringio_each_byte, :bytes

spec/ruby/library/stringio/chars_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require 'stringio'
-require File.expand_path('../shared/each_char', __FILE__)
+require_relative 'shared/each_char'
 
 describe "StringIO#chars" do
   it_behaves_like :stringio_each_char, :chars

spec/ruby/library/stringio/close_read_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#close_read" do
   before :each do

spec/ruby/library/stringio/close_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#close" do
   before :each do

spec/ruby/library/stringio/close_write_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#close_write" do
   before :each do

spec/ruby/library/stringio/closed_read_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#closed_read?" do
   it "returns true if self is not readable" do

spec/ruby/library/stringio/closed_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#closed?" do
   it "returns true if self is completely closed" do

spec/ruby/library/stringio/closed_write_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#closed_write?" do
   it "returns true if self is not writable" do

spec/ruby/library/stringio/codepoints_spec.rb

@@ -1,7 +1,7 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/codepoints', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/codepoints'
 
 # See redmine #1667
 describe "StringIO#codepoints" do

spec/ruby/library/stringio/each_byte_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require 'stringio'
-require File.expand_path('../shared/each_byte', __FILE__)
+require_relative 'shared/each_byte'
 
 describe "StringIO#each_byte" do
   it_behaves_like :stringio_each_byte, :each_byte

spec/ruby/library/stringio/each_char_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require 'stringio'
-require File.expand_path('../shared/each_char', __FILE__)
+require_relative 'shared/each_char'
 
 describe "StringIO#each_char" do
   it_behaves_like :stringio_each_char, :each_char

spec/ruby/library/stringio/each_codepoint_spec.rb

@@ -1,7 +1,7 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/codepoints', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/codepoints'
 
 # See redmine #1667
 describe "StringIO#each_codepoint" do

spec/ruby/library/stringio/each_line_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/each', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/each'
 
 describe "StringIO#each_line when passed a separator" do
   it_behaves_like :stringio_each_separator, :each_line

spec/ruby/library/stringio/each_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/each', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/each'
 
 describe "StringIO#each when passed a separator" do
   it_behaves_like :stringio_each_separator, :each

spec/ruby/library/stringio/eof_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/eof', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/eof'
 
 describe "StringIO#eof?" do
   it_behaves_like :stringio_eof, :eof?

spec/ruby/library/stringio/external_encoding_spec.rb

@@ -1,5 +1,5 @@
 require 'stringio'
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "StringIO#external_encoding" do
   it "gets the encoding of the underlying String" do

spec/ruby/library/stringio/fcntl_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#fcntl" do
   it "raises a NotImplementedError" do

spec/ruby/library/stringio/fileno_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/each', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/each'
 
 describe "StringIO#fileno" do
   it "returns nil" do

spec/ruby/library/stringio/flush_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#flush" do
   it "returns self" do

spec/ruby/library/stringio/fsync_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#fsync" do
   it "returns zero" do

spec/ruby/library/stringio/getbyte_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require 'stringio'
-require File.expand_path('../shared/getc', __FILE__)
+require_relative 'shared/getc'
 
 describe "StringIO#getbyte" do
   it_behaves_like :stringio_getc, :getbyte

spec/ruby/library/stringio/getc_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require 'stringio'
-require File.expand_path('../shared/getc', __FILE__)
+require_relative 'shared/getc'
 
 describe "StringIO#getc" do
   it_behaves_like :stringio_getc, :getc

spec/ruby/library/stringio/getch_spec.rb

@@ -1,7 +1,7 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require 'stringio'
-require File.expand_path('../shared/getc', __FILE__)
+require_relative 'shared/getc'
 
 # This method is added by io/console on require.
 describe "StringIO#getch" do

spec/ruby/library/stringio/gets_spec.rb

@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require "stringio"
 
 describe "StringIO#gets when passed [separator]" do

spec/ruby/library/stringio/initialize_spec.rb

@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require 'stringio'
 
 describe "StringIO#initialize when passed [Object, mode]" do

spec/ruby/library/stringio/internal_encoding_spec.rb

@@ -1,5 +1,5 @@
 require 'stringio'
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "StringIO#internal_encoding" do
   it "returns nil" do

spec/ruby/library/stringio/isatty_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/isatty', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/isatty'
 
 describe "StringIO#isatty" do
   it_behaves_like :stringio_isatty, :isatty

spec/ruby/library/stringio/length_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/length', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/length'
 
 describe "StringIO#length" do
   it_behaves_like :stringio_length, :length

spec/ruby/library/stringio/lineno_spec.rb

@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require "stringio"
 
 describe "StringIO#lineno" do

spec/ruby/library/stringio/lines_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require 'stringio'
-require File.expand_path('../shared/each', __FILE__)
+require_relative 'shared/each'
 
 describe "StringIO#lines when passed a separator" do
   it_behaves_like :stringio_each_separator, :lines

spec/ruby/library/stringio/open_spec.rb

@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require 'stringio'
 
 describe "StringIO.open when passed [Object, mode]" do

spec/ruby/library/stringio/path_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#path" do
   it "is not defined" do

spec/ruby/library/stringio/pid_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#pid" do
   it "returns nil" do

spec/ruby/library/stringio/pos_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/tell', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/tell'
 
 describe "StringIO#pos" do
   it_behaves_like :stringio_tell, :pos

spec/ruby/library/stringio/print_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#print" do
   before :each do

spec/ruby/library/stringio/printf_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../../../core/kernel/shared/sprintf', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative '../../core/kernel/shared/sprintf'
 
 describe "StringIO#printf" do
   before :each do

spec/ruby/library/stringio/putc_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#putc when passed [String]" do
   before :each do

spec/ruby/library/stringio/puts_spec.rb

@@ -1,7 +1,7 @@
 # -*- encoding: utf-8 -*-
 
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#puts when passed an Array" do
   before :each do

spec/ruby/library/stringio/read_nonblock_spec.rb

@@ -1,7 +1,7 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require "stringio"
-require File.expand_path('../shared/read', __FILE__)
-require File.expand_path('../shared/sysread', __FILE__)
+require_relative 'shared/read'
+require_relative 'shared/sysread'
 
 describe "StringIO#read_nonblock when passed length, buffer" do
   it_behaves_like :stringio_read, :read_nonblock

spec/ruby/library/stringio/read_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require "stringio"
-require File.expand_path('../shared/read', __FILE__)
+require_relative 'shared/read'
 
 describe "StringIO#read when passed length, buffer" do
   it_behaves_like :stringio_read, :read

spec/ruby/library/stringio/readbyte_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require 'stringio'
-require File.expand_path('../shared/readchar', __FILE__)
+require_relative 'shared/readchar'
 
 describe "StringIO#readbyte" do
   it_behaves_like :stringio_readchar, :readbyte

spec/ruby/library/stringio/readchar_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require 'stringio'
-require File.expand_path('../shared/readchar', __FILE__)
+require_relative 'shared/readchar'
 
 describe "StringIO#readchar" do
   it_behaves_like :stringio_readchar, :readchar

spec/ruby/library/stringio/readline_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 
 describe "StringIO#readline when passed [separator]" do

spec/ruby/library/stringio/readlines_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#readlines when passed [separator]" do
   before :each do

spec/ruby/library/stringio/readpartial_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#readpartial" do
   before :each do

spec/ruby/library/stringio/reopen_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#reopen when passed [Object, Integer]" do
   before :each do

spec/ruby/library/stringio/rewind_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#rewind" do
   before :each do

spec/ruby/library/stringio/seek_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#seek" do
   before :each do

spec/ruby/library/stringio/set_encoding_spec.rb

@@ -1,5 +1,5 @@
 require 'stringio'
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "StringIO#set_encoding" do
   it "sets the encoding of the underlying String" do

spec/ruby/library/stringio/size_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/length', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/length'
 
 describe "StringIO#size" do
   it_behaves_like :stringio_length, :size

spec/ruby/library/stringio/string_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#string" do
   it "returns the underlying string" do

spec/ruby/library/stringio/stringio_spec.rb

@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require "stringio"
 
 describe "StringIO" do

spec/ruby/library/stringio/sync_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#sync" do
   it "returns true" do

spec/ruby/library/stringio/sysread_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require "stringio"
-require File.expand_path('../shared/read', __FILE__)
+require_relative 'shared/read'
 
 describe "StringIO#sysread when passed length, buffer" do
   it_behaves_like :stringio_read, :sysread

spec/ruby/library/stringio/syswrite_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/write', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/write'
 
 describe "StringIO#syswrite when passed [Object]" do
   it_behaves_like :stringio_write, :syswrite

spec/ruby/library/stringio/tell_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/tell', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/tell'
 
 describe "StringIO#tell" do
   it_behaves_like :stringio_tell, :tell

spec/ruby/library/stringio/truncate_spec.rb

@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require "stringio"
 
 describe "StringIO#truncate when passed [length]" do

spec/ruby/library/stringio/tty_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/isatty', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/isatty'
 
 describe "StringIO#tty?" do
   it_behaves_like :stringio_isatty, :tty?

spec/ruby/library/stringio/ungetbyte_spec.rb

@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 require 'stringio'
 
 describe "StringIO#ungetbyte" do

spec/ruby/library/stringio/ungetc_spec.rb

@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "StringIO#ungetc when passed [char]" do
   before :each do

spec/ruby/library/stringio/write_nonblock_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/write', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/write'
 
 describe "StringIO#write_nonblock when passed [Object]" do
   it_behaves_like :stringio_write, :write_nonblock

spec/ruby/library/stringio/write_spec.rb

@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/write', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/write'
 
 describe "StringIO#write when passed [Object]" do
   it_behaves_like :stringio_write, :write