Rewind StringIO instances before be parsed again

activesupport/test/xml_mini/libxml_engine_test.rb

@@ -195,6 +195,7 @@ class LibxmlEngineTest < ActiveSupport::TestCase
   private
     def assert_equal_rexml(xml)
       parsed_xml = XmlMini.parse(xml)
+      xml.rewind if xml.respond_to?(:rewind)
       hash = XmlMini.with_backend('REXML') { XmlMini.parse(xml) }
       assert_equal(hash, parsed_xml)
     end

activesupport/test/xml_mini/libxmlsax_engine_test.rb

@@ -186,6 +186,7 @@ class LibXMLSAXEngineTest < ActiveSupport::TestCase
   private
     def assert_equal_rexml(xml)
       parsed_xml = XmlMini.parse(xml)
+      xml.rewind if xml.respond_to?(:rewind)
       hash = XmlMini.with_backend('REXML') { XmlMini.parse(xml) }
       assert_equal(hash, parsed_xml)
     end

activesupport/test/xml_mini/nokogiri_engine_test.rb

@@ -208,6 +208,7 @@ class NokogiriEngineTest < ActiveSupport::TestCase
   private
     def assert_equal_rexml(xml)
       parsed_xml = XmlMini.parse(xml)
+      xml.rewind if xml.respond_to?(:rewind)
       hash = XmlMini.with_backend('REXML') { XmlMini.parse(xml) }
       assert_equal(hash, parsed_xml)
     end

activesupport/test/xml_mini/nokogirisax_engine_test.rb

@@ -209,6 +209,7 @@ class NokogiriSAXEngineTest < ActiveSupport::TestCase
   private
     def assert_equal_rexml(xml)
       parsed_xml = XmlMini.parse(xml)
+      xml.rewind if xml.respond_to?(:rewind)
       hash = XmlMini.with_backend('REXML') { XmlMini.parse(xml) }
       assert_equal(hash, parsed_xml)
     end

activesupport/test/xml_mini/rexml_engine_test.rb

@@ -30,6 +30,7 @@ class REXMLEngineTest < ActiveSupport::TestCase
   private
     def assert_equal_rexml(xml)
       parsed_xml = XmlMini.parse(xml)
+      xml.rewind if xml.respond_to?(:rewind)
       hash = XmlMini.with_backend('REXML') { XmlMini.parse(xml) }
       assert_equal(hash, parsed_xml)
     end