Demonstrating two encoding-related issues for fakefs

fakefs-encodings-test.rb

# encoding: UTF-8

def test(env)
  fn = 'foo'

  File.open(fn, 'w:UTF-8') { |f| f.write '☃' }

  begin
    puts "Read from #{env} file: #{File.read(fn, :encoding => 'UTF-8')}"
  rescue => e
    puts "ERROR: File.read failed for #{env}: #{e}"
  end

  begin
    File.open(fn, 'r', :encoding => 'UTF-8') do |f|
      puts "IO encoding on #{env} filehandle: #{f.external_encoding}"
    end
  rescue => e
    puts "ERROR: File.open failed for #{env}: #{e}"
  end
end

puts RUBY_DESCRIPTION

puts
test 'real'
puts
require 'fakefs'
test 'fakefs'

gistfile1.txt

ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin10.8.0]

Read from real file: ☃
IO encoding on real filehandle: UTF-8

ERROR: File.read failed for fakefs: wrong number of arguments (2 for 1)
IO encoding on fakefs filehandle: US-ASCII

N.b.: gist doesn't seem to display UTF-8 properly. If you clone the gist, the problem will be clearer.