Nokogiri nth-child problems with LibXML 2.9

README.md

Nokogiri nth-child problems with LibXML 2.9

I encounted this when using an older version of Nokogiri (1.5.11) and a newer version of LibXML (2.9.0).

These tests fail for me with Nokogiri 1.5.11 and pass using Nokogiri 1.6.6.2.

Comment out the version restriction in the Gemfile and bundle update nokogiri to see the tests pass.

Nokogiri version info

Nokogiri (1.5.11)

---
warnings: []
nokogiri: 1.5.11
ruby:
  version: 2.2.0
  platform: x86_64-darwin14
  description: ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
  engine: ruby
libxml:
  binding: extension
  compiled: 2.9.0
  loaded: 2.9.0

Nokogiri (1.6.6.2)

---
warnings: []
nokogiri: 1.6.6.2
ruby:
  version: 2.2.0
  platform: x86_64-darwin14
  description: ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
  engine: ruby
libxml:
  binding: extension
  source: packaged
  libxml2_path: "/private/tmp/wem-nokogiri/.bundle/gems/gems/nokogiri-1.6.6.2/ports/x86_64-apple-darwin14.0.0/libxml2/2.9.2"
  libxslt_path: "/private/tmp/wem-nokogiri/.bundle/gems/gems/nokogiri-1.6.6.2/ports/x86_64-apple-darwin14.0.0/libxslt/1.1.28"
  libxml2_patches:
  - 0001-Revert-Missing-initialization-for-the-catalog-module.patch
  - 0002-Fix-missing-entities-after-CVE-2014-3660-fix.patch
  libxslt_patches:
  - 0001-Adding-doc-update-related-to-1.1.28.patch
  - 0002-Fix-a-couple-of-places-where-f-printf-parameters-wer.patch
  - 0003-Initialize-pseudo-random-number-generator-with-curre.patch
  - 0004-EXSLT-function-str-replace-is-broken-as-is.patch
  - 0006-Fix-str-padding-to-work-with-UTF-8-strings.patch
  - 0007-Separate-function-for-predicate-matching-in-patterns.patch
  - 0008-Fix-direct-pattern-matching.patch
  - 0009-Fix-certain-patterns-with-predicates.patch
  - 0010-Fix-handling-of-UTF-8-strings-in-EXSLT-crypto-module.patch
  - 0013-Memory-leak-in-xsltCompileIdKeyPattern-error-path.patch
  - 0014-Fix-for-bug-436589.patch
  - 0015-Fix-mkdir-for-mingw.patch
  compiled: 2.9.2
  loaded: 2.9.2

Gemfile

source 'https://rubygems.org'

gem 'nokogiri', '1.5.11'

gem 'test-unit'

Gemfile.lock

GEM
  remote: https://rubygems.org/
  specs:
    nokogiri (1.5.11)
    power_assert (0.2.3)
    test-unit (3.0.9)
      power_assert

PLATFORMS
  ruby

DEPENDENCIES
  nokogiri (= 1.5.11)
  test-unit

nokogiri_test.rb

require 'bundler/setup'
require 'nokogiri'
require 'test/unit'

class NokogiriNthChildTest < Test::Unit::TestCase
  def setup
    @doc = Nokogiri::HTML(html)
  end
  
  def test_should_return_container_1
    nodes = @doc.css('.container:nth-child(1)')
    assert_equal 1, nodes.length
    assert_match /container-1/, nodes.first.attributes['class'].value
  end
  
  def test_should_return_container_2
    nodes = @doc.css('.container:nth-child(2)')
    assert_equal 1, nodes.length
    assert_match /container-2/, nodes.first.attributes['class'].value
  end
  
  private
  
  def html
    <<-EndHtml
<div class="container container-1"></div>
<div class="container container-2"></div>
    EndHtml
  end
end

puts Nokogiri::VersionInfo.new.to_markdown