have_xml.rb

require 'nokogiri'
+
+RSpec::Matchers.define :have_xml do |xpath, condition|
+  match do |body|
+    doc = Nokogiri::XML::Document.parse(body)
+    nodes = doc.xpath(xpath)
+    expect(nodes).not_to be_empty
+
+    if condition
+      condition.keys.each do |key|
+        case key
+        when :text
+          nodes.each do |node|
+          expect(node.content).to eq condition[key]
+        end
+        when :attribute
+          nodes.each do |node|
+            condition_hash = condition[key].stringify_keys
+            values = condition_hash.values
+            keys = condition_hash.keys
+
+            expect(node.attributes.keys).to include *keys
+            expect(node.attributes[condition_hash.keys[0]].value).to eq values[0]
+          end
+        end
+      end
+    end
+    true
+  end
+
+  failure_message do |body|
+    "expected to find xml tag #{xpath} in:\n#{body}"
+  end
+
+  failure_message_when_negated do |response|
+    "expected not to find xml tag #{xpath} in:\n#{body}"
+  end
+
+  description do
+    "have xml tag #{xpath}"
+  end
+end