```ruby
require File.expand_path('../../../../spec_helper', __FILE__)
require 'stringio'
require 'zlib'

describe "GzipWriter#write" 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 "".b
  end

  it "writes some compressed data" do
    Zlib::GzipWriter.wrap @io do |gzio|
      gzio.write @data
    end

    # skip gzip header for now
    @io.string.unpack('C*')[10..-1].should == @zip.unpack('C*')[10..-1]
  end

  it "returns the number of bytes in the input" do
    Zlib::GzipWriter.wrap @io do |gzio|
      gzio.write(@data).should == @data.size
    end
  end

  it "handles inputs of 2^23 bytes" do
    input = '.'.b * (2 ** 23)

    Zlib::GzipWriter.wrap @io do |gzio|
      gzio.write input
    end
    @io.string.size.should == 8174
  end
end
```

Fix expectation in a zlib spec
user
```ruby
require File.expand_path('../../../../spec_helper', __FILE__)
require 'stringio'
require 'zlib'

describe "GzipWriter#write" 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 "".b
  end

  it "writes some compressed data" do
    Zlib::GzipWriter.wrap @io do |gzio|
      gzio.write @data
    end

    # skip gzip header for now
    @io.string.unpack('C*')[10..-1].should == @zip.unpack('C*')[10..-1]
  end

  it "returns the number of bytes in the input" do
    Zlib::GzipWriter.wrap @io do |gzio|
      gzio.write(@data).should == @data.size
    end
  end

  it "handles inputs of 2^23 bytes" do
    input = '.'.b * (2 ** 23)

    Zlib::GzipWriter.wrap @io do |gzio|
      gzio.write input
    end
    @io.string.size.should == 8176
  end
end
```
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