Sibling and ancestor queries should support Simple::Node

lib/capybara/node/simple.rb

@@ -191,6 +191,9 @@ module Capybara
         {}
       end
 
+      def ==(other)
+        native == other.native
+      end
     private
 
       def option_value(option)

lib/capybara/queries/ancestor_query.rb

@@ -8,7 +8,8 @@ module Capybara
         @child_node = node
 
         node.synchronize do
-          match_results = super(node.session.current_scope, exact)
+          scope = node.respond_to?(:session) ? node.session.current_scope : node.find(:xpath, '/*')
+          match_results = super(scope, exact)
           ancestors = node.find_xpath(XPath.ancestor.to_s)
                           .map(&method(:to_element))
                           .select { |el| match_results.include?(el) }

lib/capybara/queries/sibling_query.rb

@@ -7,7 +7,8 @@ module Capybara
       def resolve_for(node, exact = nil)
         @sibling_node = node
         node.synchronize do
-          match_results = super(node.session.current_scope, exact)
+          scope = node.respond_to?(:session) ? node.session.current_scope : node.find(:xpath, '/*')
+          match_results = super(scope, exact)
           siblings = node.find_xpath((XPath.preceding_sibling + XPath.following_sibling).to_s)
                          .map(&method(:to_element))
                          .select { |el| match_results.include?(el) }

spec/basic_node_spec.rb

@@ -111,6 +111,18 @@ RSpec.describe Capybara do
       expect(string.find('//form/input[@name="meh"]')).not_to be_disabled
     end
 
+    it 'allows finding siblings' do
+      h1 = string.find(:css, 'h1')
+      expect(h1).to have_sibling(:css, 'p', text: 'Yes it is')
+      expect(h1).not_to have_sibling(:css, 'p', text: 'Jonas Nicklas')
+    end
+
+    it 'allows finding ancestor' do
+      h1 = string.find(:css, 'h1')
+      expect(h1).to have_ancestor(:css, '#content')
+      expect(h1).not_to have_ancestor(:css, '#footer')
+    end
+
     it 'drops illegal fragments when using gumbo' do
       skip 'libxml is less strict than Gumbo' unless Nokogiri.respond_to?(:HTML5)
       expect(described_class.string('<td>1</td>')).not_to have_css('td')