File: test_document.rb

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require "helper"

require "uri"

module Nokogiri
  module XML
    class TestDocument < Nokogiri::TestCase
      URI = if URI.const_defined?(:DEFAULT_PARSER)
              ::URI::DEFAULT_PARSER
            else
              ::URI
            end

      def setup
        super
        @xml = Nokogiri::XML.parse(File.read(XML_FILE), XML_FILE)
      end

      def test_dtd_with_empty_internal_subset
        doc = Nokogiri::XML <<-eoxml
<?xml version="1.0"?>
<!DOCTYPE people >
<people>
</people>
        eoxml
        assert doc.root
      end

      # issue #1005
      def test_strict_parsing_empty_doc_should_raise_exception
        ["", " "].each do |empty_string|
          assert_raises(SyntaxError, "empty string '#{empty_string}' should raise a SyntaxError") do
            Nokogiri::XML(empty_string) { |c| c.strict }
          end
          assert_raises(SyntaxError, "StringIO of '#{empty_string}' should raise a SyntaxError") do
            Nokogiri::XML(StringIO.new(empty_string)) { |c| c.strict }
          end
        end
      end

      # issue #838
      def test_document_with_invalid_prolog
        doc = Nokogiri::XML "<? ?>"
        assert_empty doc.content
      end

      # issue #837
      def test_document_with_refentity
        doc = Nokogiri::XML "&amp;"
        assert_equal "", doc.content
      end

      # issue 1060
      def test_node_ownership_after_dup
        html = "<html><head></head><body><div>replace me</div></body></html>"
        doc = Nokogiri::XML::Document.parse(html)
        dup = doc.dup
        assert_same dup, dup.at_css("div").document

        # should not raise an exception
        dup.at_css("div").parse("<div>replaced</div>")
      end

      # issue #835
      def test_manually_adding_reference_entities
        d = Nokogiri::XML::Document.new
        root = Nokogiri::XML::Element.new("bar", d)
        txt = Nokogiri::XML::Text.new("foo", d)
        ent = Nokogiri::XML::EntityReference.new(d, "#8217")
        root << txt
        root << ent
        d << root
        assert_match(/&#8217;/, d.to_html)
      end

      def test_document_with_initial_space
        doc = Nokogiri::XML(" <?xml version='1.0' encoding='utf-8' ?><first \>")
        assert_equal 2, doc.children.size
      end

      def test_root_set_to_nil
        @xml.root = nil
        assert_nil @xml.root
      end

      def test_million_laugh_attach
        doc = Nokogiri::XML '<?xml version="1.0"?>
<!DOCTYPE lolz [
<!ENTITY lol "lol">
<!ENTITY lol2 "&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;">
<!ENTITY lol3 "&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;">
<!ENTITY lol4 "&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;">
<!ENTITY lol5 "&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;">
<!ENTITY lol6 "&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;">
<!ENTITY lol7 "&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;">
<!ENTITY lol8 "&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;">
<!ENTITY lol9 "&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;">
]>
<lolz>&lol9;</lolz>'
        assert_not_nil doc
      end

      def test_million_laugh_attach_2
        doc = Nokogiri::XML '<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE member [
   <!ENTITY a "&b;&b;&b;&b;&b;&b;&b;&b;&b;&b;">
   <!ENTITY b "&c;&c;&c;&c;&c;&c;&c;&c;&c;&c;">
   <!ENTITY c "&d;&d;&d;&d;&d;&d;&d;&d;&d;&d;">
   <!ENTITY d "&e;&e;&e;&e;&e;&e;&e;&e;&e;&e;">
   <!ENTITY e "&f;&f;&f;&f;&f;&f;&f;&f;&f;&f;">
   <!ENTITY f "&g;&g;&g;&g;&g;&g;&g;&g;&g;&g;">
   <!ENTITY g "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx">
 ]>
 <member>
 &a;
 </member>'
        assert_not_nil doc
      end

      def test_ignore_unknown_namespace
        doc = Nokogiri::XML(<<-eoxml)
        <xml>
          <unknown:foo xmlns='http://hello.com/' />
          <bar />
        </xml>
        eoxml
        if Nokogiri.jruby?
          refute doc.xpath("//foo").first.namespace # assert that the namespace is nil
        end
        refute_empty doc.xpath("//bar"), "bar wasn't found in the document" # bar should be part of the doc
      end

      def test_collect_namespaces
        doc = Nokogiri::XML(<<-eoxml)
        <xml>
          <foo xmlns='hello'>
            <bar xmlns:foo='world' />
          </foo>
        </xml>
        eoxml
        assert_equal({ "xmlns" => "hello", "xmlns:foo" => "world" },
                     doc.collect_namespaces)
      end

      def test_subclass_initialize_modify # testing a segv
        Class.new(Nokogiri::XML::Document) {
          def initialize
            super
            body_node = Nokogiri::XML::Node.new "body", self
            body_node.content = "stuff"
            self.root = body_node
          end
        }.new
      end

      def test_create_text_node
        txt = @xml.create_text_node "foo"
        assert_instance_of Nokogiri::XML::Text, txt
        assert_equal "foo", txt.text
        assert_equal @xml, txt.document
      end

      def test_create_text_node_with_block
        @xml.create_text_node "foo" do |txt|
          assert_instance_of Nokogiri::XML::Text, txt
          assert_equal "foo", txt.text
          assert_equal @xml, txt.document
        end
      end

      def test_create_element
        elm = @xml.create_element("foo")
        assert_instance_of Nokogiri::XML::Element, elm
        assert_equal "foo", elm.name
        assert_equal @xml, elm.document
      end

      def test_create_element_with_block
        @xml.create_element("foo") do |elm|
          assert_instance_of Nokogiri::XML::Element, elm
          assert_equal "foo", elm.name
          assert_equal @xml, elm.document
        end
      end

      def test_create_element_with_attributes
        elm = @xml.create_element("foo", :a => "1")
        assert_instance_of Nokogiri::XML::Element, elm
        assert_instance_of Nokogiri::XML::Attr, elm.attributes["a"]
        assert_equal "1", elm["a"]
      end

      def test_create_element_with_namespace
        elm = @xml.create_element("foo", :'xmlns:foo' => "http://tenderlovemaking.com")
        assert_equal "http://tenderlovemaking.com", elm.namespaces["xmlns:foo"]
      end

      def test_create_element_with_hyphenated_namespace
        elm = @xml.create_element("foo", :'xmlns:SOAP-ENC' => "http://tenderlovemaking.com")
        assert_equal "http://tenderlovemaking.com", elm.namespaces["xmlns:SOAP-ENC"]
      end

      def test_create_element_with_content
        elm = @xml.create_element("foo", "needs more xml/violence")
        assert_equal "needs more xml/violence", elm.content
      end

      def test_create_cdata
        cdata = @xml.create_cdata("abc")
        assert_instance_of Nokogiri::XML::CDATA, cdata
        assert_equal "abc", cdata.content
      end

      def test_create_cdata_with_block
        @xml.create_cdata("abc") do |cdata|
          assert_instance_of Nokogiri::XML::CDATA, cdata
          assert_equal "abc", cdata.content
        end
      end

      def test_create_comment
        comment = @xml.create_comment("abc")
        assert_instance_of Nokogiri::XML::Comment, comment
        assert_equal "abc", comment.content
      end

      def test_create_comment_with_block
        @xml.create_comment("abc") do |comment|
          assert_instance_of Nokogiri::XML::Comment, comment
          assert_equal "abc", comment.content
        end
      end

      def test_pp
        out = StringIO.new(String.new)
        ::PP.pp @xml, out
        assert_operator out.string.length, :>, 0
      end

      def test_create_internal_subset_on_existing_subset
        assert_not_nil @xml.internal_subset
        assert_raises(RuntimeError) do
          @xml.create_internal_subset("staff", nil, "staff.dtd")
        end
      end

      def test_create_internal_subset
        xml = Nokogiri::XML("<root />")
        assert_nil xml.internal_subset

        xml.create_internal_subset("name", nil, "staff.dtd")
        ss = xml.internal_subset
        assert_equal "name", ss.name
        assert_nil ss.external_id
        assert_equal "staff.dtd", ss.system_id
      end

      def test_external_subset
        assert_nil @xml.external_subset
        Dir.chdir(ASSETS_DIR) do
          @xml = Nokogiri::XML.parse(File.read(XML_FILE), XML_FILE) { |cfg|
            cfg.dtdload
          }
        end
        assert @xml.external_subset
      end

      def test_create_external_subset_fails_with_existing_subset
        assert_nil @xml.external_subset
        Dir.chdir(ASSETS_DIR) do
          @xml = Nokogiri::XML.parse(File.read(XML_FILE), XML_FILE) { |cfg|
            cfg.dtdload
          }
        end
        assert @xml.external_subset

        assert_raises(RuntimeError) do
          @xml.create_external_subset("staff", nil, "staff.dtd")
        end
      end

      def test_create_external_subset
        dtd = @xml.create_external_subset("staff", nil, "staff.dtd")
        assert_nil dtd.external_id
        assert_equal "staff.dtd", dtd.system_id
        assert_equal "staff", dtd.name
        assert_equal dtd, @xml.external_subset
      end

      def test_version
        assert_equal "1.0", @xml.version
      end

      def test_add_namespace
        assert_raise NoMethodError do
          @xml.add_namespace("foo", "bar")
        end
      end

      def test_attributes
        assert_raise NoMethodError do
          @xml.attributes
        end
      end

      def test_namespace
        assert_raise NoMethodError do
          @xml.namespace
        end
      end

      def test_namespace_definitions
        assert_raise NoMethodError do
          @xml.namespace_definitions
        end
      end

      def test_line
        assert_raise NoMethodError do
          @xml.line
        end
      end

      def test_empty_node_converted_to_html_is_not_self_closing
        doc = Nokogiri::XML("<a></a>")
        assert_equal "<a></a>", doc.inner_html
      end

      def test_fragment
        fragment = @xml.fragment
        assert_equal 0, fragment.children.length
      end

      def test_add_child_fragment_with_single_node
        doc = Nokogiri::XML::Document.new
        fragment = doc.fragment("<hello />")
        doc.add_child fragment
        assert_equal "/hello", doc.at("//hello").path
        assert_equal "hello", doc.root.name
      end

      def test_add_child_fragment_with_multiple_nodes
        doc = Nokogiri::XML::Document.new
        fragment = doc.fragment("<hello /><goodbye />")
        assert_raises(RuntimeError) do
          doc.add_child fragment
        end
      end

      def test_add_child_with_multiple_roots
        assert_raises(RuntimeError) do
          @xml << Node.new("foo", @xml)
        end
      end

      def test_add_child_with_string
        doc = Nokogiri::XML::Document.new
        doc.add_child "<div>quack!</div>"
        assert_equal 1, doc.root.children.length
        assert_equal "quack!", doc.root.children.first.content
      end

      def test_prepend
        doc = Nokogiri::XML("<root>")

        node_set = doc.root.prepend_child "<branch/>"
        assert_equal %w[branch], node_set.map(&:name)

        branch = doc.at("//branch")

        leaves = %w[leaf1 leaf2 leaf3]
        leaves.each { |name|
          branch.prepend_child("<%s/>" % name)
        }
        assert_equal leaves.length, branch.children.length
        assert_equal leaves.reverse, branch.children.map(&:name)
      end

      def test_prepend_child_fragment_with_single_node
        doc = Nokogiri::XML::Document.new
        fragment = doc.fragment("<hello />")
        doc.prepend_child fragment
        assert_equal "/hello", doc.at("//hello").path
        assert_equal "hello", doc.root.name
      end

      def test_prepend_child_fragment_with_multiple_nodes
        doc = Nokogiri::XML::Document.new
        fragment = doc.fragment("<hello /><goodbye />")
        assert_raises(RuntimeError) do
          doc.prepend_child fragment
        end
      end

      def test_prepend_child_with_multiple_roots
        assert_raises(RuntimeError) do
          @xml.prepend_child Node.new("foo", @xml)
        end
      end

      def test_prepend_child_with_string
        doc = Nokogiri::XML::Document.new
        doc.prepend_child "<div>quack!</div>"
        assert_equal 1, doc.root.children.length
        assert_equal "quack!", doc.root.children.first.content
      end

      def test_move_root_to_document_with_no_root
        sender = Nokogiri::XML("<root>foo</root>")
        newdoc = Nokogiri::XML::Document.new
        newdoc.root = sender.root
      end

      def test_move_root_with_existing_root_gets_gcd
        doc = Nokogiri::XML("<root>test</root>")
        doc2 = Nokogiri::XML("<root>#{"x" * 5000000}</root>")
        doc2.root = doc.root
      end

      def test_validate
        if Nokogiri.uses_libxml?
          assert_equal 45, @xml.validate.length
        else
          xml = Nokogiri::XML.parse(File.read(XML_FILE), XML_FILE) { |cfg| cfg.dtdvalid }
          assert_equal 40, xml.validate.length
        end
      end

      def test_validate_no_internal_subset
        doc = Nokogiri::XML("<test/>")
        assert_nil doc.validate
      end

      def test_clone
        assert @xml.clone
      end

      def test_document_should_not_have_default_ns
        doc = Nokogiri::XML::Document.new

        assert_raises NoMethodError do
          doc.default_namespace = "http://innernet.com/"
        end

        assert_raises NoMethodError do
          doc.add_namespace_definition("foo", "bar")
        end
      end

      def test_parse_handles_nil_gracefully
        @doc = Nokogiri::XML::Document.parse(nil)
        assert_instance_of Nokogiri::XML::Document, @doc
      end

      def test_parse_takes_block
        options = nil
        Nokogiri::XML.parse(File.read(XML_FILE), XML_FILE) do |cfg|
          options = cfg
        end
        assert options
      end

      def test_parse_yields_parse_options
        options = nil
        Nokogiri::XML.parse(File.read(XML_FILE), XML_FILE) do |cfg|
          options = cfg
          options.nonet.nowarning.dtdattr
        end
        assert options.nonet?
        assert options.nowarning?
        assert options.dtdattr?
      end

      def test_XML_takes_block
        options = nil
        Nokogiri::XML(File.read(XML_FILE), XML_FILE) do |cfg|
          options = cfg
          options.nonet.nowarning.dtdattr
        end
        assert options.nonet?
        assert options.nowarning?
        assert options.dtdattr?
      end

      def test_subclass
        klass = Class.new(Nokogiri::XML::Document)
        doc = klass.new
        assert_instance_of klass, doc
      end

      def test_subclass_initialize
        klass = Class.new(Nokogiri::XML::Document) do
          attr_accessor :initialized_with

          def initialize(*args)
            @initialized_with = args
          end
        end
        doc = klass.new("1.0", 1)
        assert_equal ["1.0", 1], doc.initialized_with
      end

      def test_subclass_dup
        klass = Class.new(Nokogiri::XML::Document)
        doc = klass.new.dup
        assert_instance_of klass, doc
      end

      def test_subclass_parse
        klass = Class.new(Nokogiri::XML::Document)
        doc = klass.parse(File.read(XML_FILE))
        # lame hack uses root to avoid comparing DOCTYPE tags which can appear out of order.
        # I should really finish lorax and use that here.
        assert_equal @xml.root.to_s, doc.root.to_s
        assert_instance_of klass, doc
      end

      def test_document_parse_method
        xml = Nokogiri::XML::Document.parse(File.read(XML_FILE))
        # lame hack uses root to avoid comparing DOCTYPE tags which can appear out of order.
        # I should really finish lorax and use that here.
        assert_equal @xml.root.to_s, xml.root.to_s
      end

      def test_encoding=
        @xml.encoding = "UTF-8"
        assert_match "UTF-8", @xml.to_xml

        @xml.encoding = "EUC-JP"
        assert_match "EUC-JP", @xml.to_xml
      end

      def test_namespace_should_not_exist
        assert_raises(NoMethodError) {
          @xml.namespace
        }
      end

      def test_non_existant_function
        # WTF.  I don't know why this is different between MRI and Jruby
        # They should be the same...  Either way, raising an exception
        # is the correct thing to do.
        exception = RuntimeError

        if !Nokogiri.uses_libxml? || (Nokogiri.uses_libxml? && Nokogiri::VERSION_INFO["libxml"]["platform"] == "jruby")
          exception = Nokogiri::XML::XPath::SyntaxError
        end

        assert_raises(exception) {
          @xml.xpath("//name[foo()]")
        }
      end

      def test_xpath_syntax_error
        assert_raises(Nokogiri::XML::XPath::SyntaxError) do
          @xml.xpath('\\')
        end
      end

      def test_ancestors
        assert_equal 0, @xml.ancestors.length
      end

      def test_root_node_parent_is_document
        parent = @xml.root.parent
        assert_equal @xml, parent
        assert_instance_of Nokogiri::XML::Document, parent
      end

      def test_xmlns_is_automatically_registered
        doc = Nokogiri::XML(<<-eoxml)
          <root xmlns="http://tenderlovemaking.com/">
            <foo>
              bar
            </foo>
          </root>
        eoxml
        assert_equal 1, doc.css("xmlns|foo").length
        assert_equal 1, doc.css("foo").length
        assert_equal 0, doc.css("|foo").length
        assert_equal 1, doc.xpath("//xmlns:foo").length
        assert_equal 1, doc.search("xmlns|foo").length
        assert_equal 1, doc.search("//xmlns:foo").length
        assert doc.at("xmlns|foo")
        assert doc.at("//xmlns:foo")
        assert doc.at("foo")
      end

      def test_xmlns_is_registered_for_nodesets
        doc = Nokogiri::XML(<<-eoxml)
          <root xmlns="http://tenderlovemaking.com/">
            <foo>
              <bar>
                baz
              </bar>
            </foo>
          </root>
        eoxml
        assert_equal 1, doc.css("xmlns|foo").css("xmlns|bar").length
        assert_equal 1, doc.css("foo").css("bar").length
        assert_equal 1, doc.xpath("//xmlns:foo").xpath("./xmlns:bar").length
        assert_equal 1, doc.search("xmlns|foo").search("xmlns|bar").length
        assert_equal 1, doc.search("//xmlns:foo").search("./xmlns:bar").length
      end

      def test_to_xml_with_indent
        doc = Nokogiri::XML("<root><foo><bar/></foo></root>")
        doc = Nokogiri::XML(doc.to_xml(:indent => 5))

        assert_indent 5, doc
      end

      def test_write_xml_to_with_indent
        io = StringIO.new
        doc = Nokogiri::XML("<root><foo><bar/></foo></root>")
        doc.write_xml_to io, :indent => 5
        io.rewind
        doc = Nokogiri::XML(io.read)
        assert_indent 5, doc
      end

      if ! Nokogiri.uses_libxml?("~> 2.6.0")
        def test_encoding
          xml = Nokogiri::XML(File.read(XML_FILE), XML_FILE, "UTF-8")
          assert_equal "UTF-8", xml.encoding
        end
      end

      def test_memory_explosion_on_invalid_xml
        doc = Nokogiri::XML("<<<")
        refute_nil doc
        refute_empty doc.errors
      end

      def test_memory_explosion_on_wrong_formatted_element_following_the_root_element
        doc = Nokogiri::XML("<a/><\n")
        refute_nil doc
        refute_empty doc.errors
      end

      def test_document_has_errors
        doc = Nokogiri::XML(<<-eoxml)
          <foo><bar></foo>
        eoxml
        assert doc.errors.length > 0
        doc.errors.each do |error|
          assert_match error.message, error.inspect
          assert_match error.message, error.to_s
        end
      end

      def test_strict_document_throws_syntax_error
        assert_raises(Nokogiri::XML::SyntaxError) {
          Nokogiri::XML("<foo><bar></foo>", nil, nil, 0)
        }

        assert_raises(Nokogiri::XML::SyntaxError) {
          Nokogiri::XML("<foo><bar></foo>") { |cfg|
            cfg.strict
          }
        }

        assert_raises(Nokogiri::XML::SyntaxError) {
          Nokogiri::XML(StringIO.new("<foo><bar></foo>")) { |cfg|
            cfg.strict
          }
        }
      end

      def test_XML_function
        xml = Nokogiri::XML(File.read(XML_FILE), XML_FILE)
        assert xml.xml?
      end

      def test_url
        assert @xml.url
        assert_equal XML_FILE, @xml.url
      end

      def test_document_parent
        xml = Nokogiri::XML(File.read(XML_FILE), XML_FILE)
        assert_raises(NoMethodError) {
          xml.parent
        }
      end

      def test_document_name
        xml = Nokogiri::XML(File.read(XML_FILE), XML_FILE)
        assert_equal "document", xml.name
      end

      def test_parse_can_take_io
        xml = nil
        File.open(XML_FILE, "rb") { |f|
          xml = Nokogiri::XML(f)
        }
        assert xml.xml?
        assert_equal XML_FILE, xml.url
        set = xml.search("//employee")
        assert set.length > 0
      end

      def test_parsing_empty_io
        doc = Nokogiri::XML.parse(StringIO.new(""))
        refute_nil doc
      end

      def test_parse_works_with_an_object_that_responds_to_read
        klass = Class.new do
          def initialize
            @contents = StringIO.new("<div>foo</div>")
          end

          def read(*args)
            @contents.read(*args)
          end
        end

        doc = Nokogiri::XML.parse klass.new
        assert_equal "foo", doc.at_css("div").content
      end

      def test_parse_works_with_an_object_that_responds_to_path
        xml = String.new("<root><sub>hello</sub></root>")
        def xml.path
          "/i/should/be/the/document/url"
        end

        doc = Nokogiri::XML.parse(xml)

        assert_equal "/i/should/be/the/document/url", doc.url
      end

      # issue #1821, #2110
      def test_parse_can_take_pathnames
        assert(File.size(XML_ATOM_FILE) > 4096) # file must be big enough to trip the read callback more than once

        doc = Nokogiri::XML.parse(Pathname.new(XML_ATOM_FILE))

        # an arbitrary assertion on the structure of the document
        assert_equal 20, doc.xpath("/xmlns:feed/xmlns:entry/xmlns:author",
                                   "xmlns" => "http://www.w3.org/2005/Atom").length
        assert_equal XML_ATOM_FILE, doc.url
      end

      def test_search_on_empty_documents
        doc = Nokogiri::XML::Document.new
        ns = doc.search("//foo")
        assert_equal 0, ns.length

        ns = doc.css("foo")
        assert_equal 0, ns.length

        ns = doc.xpath("//foo")
        assert_equal 0, ns.length
      end

      def test_document_search_with_multiple_queries
        xml = '<document>
                 <thing>
                   <div class="title">important thing</div>
                 </thing>
                 <thing>
                   <div class="content">stuff</div>
                 </thing>
                 <thing>
                   <p class="blah">more stuff</div>
                 </thing>
               </document>'
        document = Nokogiri::XML(xml)
        assert_kind_of Nokogiri::XML::Document, document

        assert_equal 3, document.xpath(".//div", ".//p").length
        assert_equal 3, document.css(".title", ".content", "p").length
        assert_equal 3, document.search(".//div", "p.blah").length
      end

      def test_bad_xpath_raises_syntax_error
        assert_raises(XML::XPath::SyntaxError) {
          @xml.xpath('\\')
        }
      end

      def test_find_with_namespace
        doc = Nokogiri::XML.parse(<<-eoxml)
        <x xmlns:tenderlove='http://tenderlovemaking.com/'>
          <tenderlove:foo awesome='true'>snuggles!</tenderlove:foo>
        </x>
        eoxml

        ctx = Nokogiri::XML::XPathContext.new(doc)
        ctx.register_ns "tenderlove", "http://tenderlovemaking.com/"
        set = ctx.evaluate("//tenderlove:foo")
        assert_equal 1, set.length
        assert_equal "foo", set.first.name

        # It looks like only the URI is important:
        ctx = Nokogiri::XML::XPathContext.new(doc)
        ctx.register_ns "america", "http://tenderlovemaking.com/"
        set = ctx.evaluate("//america:foo")
        assert_equal 1, set.length
        assert_equal "foo", set.first.name

        # Its so important that a missing slash will cause it to return nothing
        ctx = Nokogiri::XML::XPathContext.new(doc)
        ctx.register_ns "america", "http://tenderlovemaking.com"
        set = ctx.evaluate("//america:foo")
        assert_equal 0, set.length
      end

      def test_xml?
        assert @xml.xml?
      end

      def test_document
        assert @xml.document
      end

      def test_singleton_methods
        assert node_set = @xml.search("//name")
        assert node_set.length > 0
        node = node_set.first
        def node.test
          "test"
        end
        assert node_set = @xml.search("//name")
        assert_equal "test", node_set.first.test
      end

      def test_multiple_search
        assert node_set = @xml.search("//employee", "//name")
        employees = @xml.search("//employee")
        names = @xml.search("//name")
        assert_equal(employees.length + names.length, node_set.length)
      end

      def test_node_set_index
        assert node_set = @xml.search("//employee")

        assert_equal(5, node_set.length)
        assert node_set[4]
        assert_nil node_set[5]
      end

      def test_search
        assert node_set = @xml.search("//employee")

        assert_equal(5, node_set.length)

        node_set.each do |node|
          assert_equal("employee", node.name)
        end
      end

      def test_dump
        assert @xml.serialize
        assert @xml.to_xml
      end

      def test_dup
        dup = @xml.dup
        assert_instance_of Nokogiri::XML::Document, dup
        assert dup.xml?, "duplicate should be xml"
      end

      def test_new
        doc = nil
        doc = Nokogiri::XML::Document.new
        assert doc
        assert doc.xml?
        assert_nil doc.root
      end

      def test_set_root
        doc = nil
        doc = Nokogiri::XML::Document.new
        assert doc
        assert doc.xml?
        assert_nil doc.root
        node = Nokogiri::XML::Node.new("b", doc) { |n|
          n.content = "hello world"
        }
        assert_equal("hello world", node.content)
        doc.root = node
        assert_equal(node, doc.root)
      end

      def test_remove_namespaces
        doc = Nokogiri::XML <<-EOX
          <root xmlns:a="http://a.flavorjon.es/" xmlns:b="http://b.flavorjon.es/">
            <a:foo>hello from a</a:foo>
            <b:foo>hello from b</b:foo>
            <container xmlns:c="http://c.flavorjon.es/">
              <c:foo c:attr='attr-value'>hello from c</c:foo>
            </container>
          </root>
        EOX

        namespaces = doc.root.namespaces

        # assert on setup
        assert_equal 2, doc.root.namespaces.length
        assert_equal 3, doc.at_xpath("//container").namespaces.length
        assert_equal 0, doc.xpath("//foo").length
        assert_equal 1, doc.xpath("//a:foo").length
        assert_equal 1, doc.xpath("//a:foo").length
        assert_equal 1, doc.xpath("//x:foo", "x" => "http://c.flavorjon.es/").length
        assert_match %r{foo c:attr}, doc.to_xml
        doc.at_xpath("//x:foo", "x" => "http://c.flavorjon.es/").tap do |node|
          assert_nil node["attr"]
          assert_equal "attr-value", node["c:attr"]
          assert_nil node.attribute_with_ns("attr", nil)
          assert_equal "attr-value", node.attribute_with_ns("attr", "http://c.flavorjon.es/").value
          assert_equal "attr-value", node.attributes["attr"].value
        end

        doc.remove_namespaces!

        assert_equal 0, doc.root.namespaces.length
        assert_equal 0, doc.at_xpath("//container").namespaces.length
        assert_equal 3, doc.xpath("//foo").length
        assert_equal 0, doc.xpath("//a:foo", namespaces).length
        assert_equal 0, doc.xpath("//a:foo", namespaces).length
        assert_equal 0, doc.xpath("//x:foo", "x" => "http://c.flavorjon.es/").length
        assert_match %r{foo attr}, doc.to_xml
        doc.at_xpath("//container/foo").tap do |node|
          assert_equal "attr-value", node["attr"]
          assert_nil node["c:attr"]
          assert_equal "attr-value", node.attribute_with_ns("attr", nil).value
          assert_nil node.attribute_with_ns("attr", "http://c.flavorjon.es/")
          assert_equal "attr-value", node.attributes["attr"].value # doesn't change!
        end
      end

      # issue #785
      def test_attribute_decoration
        decorator = Module.new do
          def test_method
          end
        end

        util_decorate(@xml, decorator)

        assert @xml.search("//@street").first.respond_to?(:test_method)
      end

      def test_subset_is_decorated
        x = Module.new do
          def awesome!
          end
        end
        util_decorate(@xml, x)

        assert @xml.respond_to?(:awesome!)
        assert node_set = @xml.search("//staff")
        assert node_set.respond_to?(:awesome!)
        assert subset = node_set.search(".//employee")
        assert subset.respond_to?(:awesome!)
        assert sub_subset = node_set.search(".//name")
        assert sub_subset.respond_to?(:awesome!)
      end

      def test_decorator_is_applied
        x = Module.new do
          def awesome!
          end
        end
        util_decorate(@xml, x)

        assert @xml.respond_to?(:awesome!)
        assert node_set = @xml.search("//employee")
        assert node_set.respond_to?(:awesome!)
        node_set.each do |node|
          assert node.respond_to?(:awesome!), node.class
        end
        assert @xml.root.respond_to?(:awesome!)
        assert @xml.children.respond_to?(:awesome!)
      end

      if Nokogiri.jruby?
        def wrap_java_document
          require "java"
          factory = javax.xml.parsers.DocumentBuilderFactory.newInstance
          builder = factory.newDocumentBuilder
          document = builder.newDocument
          root = document.createElement("foo")
          document.appendChild(root)
          Nokogiri::XML::Document.wrap(document)
        end
      end

      def test_java_integration
        skip("CRuby doesn't have the Document#wrap method") unless Nokogiri.jruby?
        noko_doc = wrap_java_document
        assert_equal "foo", noko_doc.root.name

        noko_doc = Nokogiri::XML(<<eoxml)
<foo xmlns='hello'>
  <bar xmlns:foo='world' />
</foo>
eoxml
        dom = noko_doc.to_java
        assert dom.kind_of? org.w3c.dom.Document
        assert_equal "foo", dom.getDocumentElement().getTagName()
      end

      def test_add_child
        skip("CRuby doesn't have the Document#wrap method") unless Nokogiri.jruby?
        doc = wrap_java_document
        doc.root.add_child "<bar />"
      end

      def test_can_be_closed
        f = File.open XML_FILE
        Nokogiri::XML f
        f.close
      end

      describe "XML::Document.parse" do
        # establish baseline behavior for HTML document behavior in
        # https://github.com/sparklemotion/nokogiri/issues/2130
        # (see similar tests in test/html/test_document.rb)
        let(:xml_strict) do
          Nokogiri::XML::ParseOptions.new(Nokogiri::XML::ParseOptions::DEFAULT_XML).norecover
        end

        it "sets the test up correctly" do
          assert(xml_strict.strict?)
        end

        describe "read memory" do
          let(:input) { "<html><body><div" }

          describe "strict parsing" do
            let(:parse_options) { xml_strict }

            it "raises exception on parse error" do
              assert_raises Nokogiri::SyntaxError do
                Nokogiri::XML.parse(input, nil, nil, parse_options)
              end
            end
          end

          describe "default options" do
            it "does not raise exception on parse error" do
              doc = Nokogiri::XML.parse(input)
              assert_operator(doc.errors.length, :>, 0)
            end
          end
        end

        describe "read io" do
          let(:input) { StringIO.new("<html><body><div") }

          describe "strict parsing" do
            let(:parse_options) { xml_strict }

            it "raises exception on parse error" do
              assert_raises Nokogiri::SyntaxError do
                Nokogiri::XML.parse(input, nil, nil, parse_options)
              end
            end
          end

          describe "default options" do
            it "does not raise exception on parse error" do
              doc = Nokogiri::XML.parse(input)
              assert_operator(doc.errors.length, :>, 0)
            end
          end
        end
      end
    end
  end
end