Datetime select extension fixes with help from @johncarney's fork

spec/support/tag_matcher.rb

@@ -0,0 +1,35 @@
+require 'nokogiri'
+
+module TagMatcher
+  extend RSpec::Matchers::DSL
+
+  matcher :have_tag do |selector|
+    match do |subject|
+      matches = doc(subject).search(selector)
+
+      if @inner_text
+        matches = matches.select { |element| element.inner_text == @inner_text }
+      end
+
+      matches.any?
+    end
+
+    chain :with_inner_text do |inner_text|
+      @inner_text = inner_text
+    end
+
+    private
+
+    def body(subject)
+      if subject.respond_to?(:body)
+        subject.body
+      else
+        subject.to_s
+      end
+    end
+
+    def doc(subject)
+      @doc ||= Nokogiri::HTML(body(subject))
+    end
+  end
+end