ruby--ruby/spec/ruby/core/io/bytes_spec.rb

# -*- encoding: utf-8 -*-
require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)

describe "IO#bytes" do
  before :each do
    @io = IOSpecs.io_fixture "lines.txt"
  end

  after :each do
    @io.close unless @io.closed?
  end

  it "returns an enumerator of the next bytes from the stream" do
    enum = @io.bytes
    enum.should be_an_instance_of(Enumerator)
    @io.readline.should == "Voici la ligne une.\n"
    enum.first(5).should == [81, 117, 105, 32, 195]
  end

  it "yields each byte" do
    count = 0
    ScratchPad.record []
    @io.each_byte do |byte|
      ScratchPad << byte
      break if 4 < count += 1
    end

    ScratchPad.recorded.should == [86, 111, 105, 99, 105]
  end

  it "raises an IOError on closed stream" do
    enum = IOSpecs.closed_io.bytes
    lambda { enum.first }.should raise_error(IOError)
  end

  it "raises an IOError on an enumerator for a stream that has been closed" do
    enum = @io.bytes
    enum.first.should == 86
    @io.close
    lambda { enum.first }.should raise_error(IOError)
  end
end