ruby--ruby/test/ruby/test_io.rb

require 'test/unit'
require 'tempfile'

class TestIO < Test::Unit::TestCase

  def make_tempfile
    t = Tempfile.new("foo")
    t.binmode
    t.puts "foo"
    t.puts "bar"
    t.puts "baz"
    t.close
    t
  end

  def test_pos
    t = make_tempfile

    open(t.path, IO::RDWR|IO::CREAT|IO::TRUNC, 0600) do |f|
      f.write "Hello"
      assert_equal(5, f.pos)
    end
    open(t.path, IO::RDWR|IO::CREAT|IO::TRUNC, 0600) do |f|
      f.sync = true
      f.read
      f.write "Hello"
      assert_equal(5, f.pos)
    end
  end

  def test_gets_rs
    r, w = IO.pipe
    w.print "\377xyz"
    w.close
    assert_equal("\377", r.gets("\377"), "[ruby-dev:24460]")
    r.close
  end
end