require 'helper'
require 'stringio'

class TestReader < Test::Unit::TestCase
  def test_reads_once
    s = StringIO.new("This is a string")
    
    reader = Bychar.wrap(s)
    assert_equal "T", reader.read_one_char
    assert_equal "h", reader.read_one_char
  end
  
  def test_eof_with_empty
    s = StringIO.new
    reader = Bychar.wrap(s)
    assert_nil reader.read_one_char
  end
  
  def test_eof_with_io_at_eof
    s = StringIO.new("foo")
    s.read(3)
    reader = Bychar.wrap(s)
    assert_nil reader.read_one_char
  end
  
  def test_eof_with_string_to_size
    s = "Foobarboo another"
    s = StringIO.new(s)
    reader = Bychar.wrap(s)
    s.length.times { reader.read_one_char }
    assert_nil reader.read_one_char
  end
end