ruby--ruby/spec/ruby/library/zlib/gzipreader/each_byte_spec.rb

require_relative '../../../spec_helper'
require 'stringio'
require 'zlib'

describe "Zlib::GzipReader#each_byte" do

  before :each do
    @data = '12345abcde'
    @zip = [31, 139, 8, 0, 44, 220, 209, 71, 0, 3, 51, 52, 50, 54, 49, 77,
            76, 74, 78, 73, 5, 0, 157, 5, 0, 36, 10, 0, 0, 0].pack('C*')

    @io = StringIO.new @zip
    ScratchPad.clear
  end

  it "calls the given block for each byte in the stream, passing the byte as an argument" do
    gz = Zlib::GzipReader.new @io

    ScratchPad.record []
    gz.each_byte { |b| ScratchPad << b }

    ScratchPad.recorded.should == [49, 50, 51, 52, 53, 97, 98, 99, 100, 101]
  end

  it "returns an enumerator, which yields each byte in the stream, when no block is passed" do
    gz = Zlib::GzipReader.new @io
    enum = gz.each_byte

    ScratchPad.record []
    while true
      begin
        ScratchPad << enum.next
      rescue StopIteration
        break
      end
    end

    ScratchPad.recorded.should == [49, 50, 51, 52, 53, 97, 98, 99, 100, 101]
  end

  it "increments position before calling the block" do
    gz = Zlib::GzipReader.new @io

    i = 1
    gz.each_byte do |ignore|
      gz.pos.should == i
      i += 1
    end
  end

end