diff --git a/mpd/base/xml/xml_node_unittest.cc b/mpd/base/xml/xml_node_unittest.cc
new file mode 100644
index 0000000000..7793f3fb63
--- /dev/null
+++ b/mpd/base/xml/xml_node_unittest.cc
@@ -0,0 +1,99 @@
+#include "base/logging.h"
+#include "base/strings/string_util.h"
+#include "mpd/base/xml/xml_node.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/libxml/src/include/libxml/tree.h"
+
+namespace dash_packager {
+namespace xml {
+
+namespace {
+
+// TODO(rkuroiwa): Add XmlStringCompare() that does not care about the
+// prettiness of the string representation of the XML. We currently use
+// CollapseWhitespaceASCII() with carefully handcrafted expectations so that we
+// can compare the result.
+
+// Template so that it works for ContentProtectionXml and
+// ContentProtectionXml::Element.
+template <typename XmlElement>
+void AddAttribute(const std::string& name,
+                  const std::string& value,
+                  XmlElement* content_protection_xml) {
+  MediaInfo::ContentProtectionXml::AttributeNameValuePair* attribute =
+      content_protection_xml->add_attributes();
+  attribute->set_name(name);
+  attribute->set_value(value);
+}
+
+std::string GetDocAsFlatString(xmlDocPtr doc) {
+  static const int kFlatFormat = 0;
+  int doc_str_size = 0;
+  xmlChar* doc_str = NULL;
+  xmlDocDumpFormatMemoryEnc(doc, &doc_str, &doc_str_size, "UTF-8", kFlatFormat);
+  DCHECK(doc_str);
+
+  std::string output(doc_str, doc_str + doc_str_size);
+  xmlFree(doc_str);
+  return output;
+}
+
+// Ownership transfers, IOW this function will release the resource for |node|.
+// Returns |node| in string format.
+std::string GetStringFormat(ScopedXmlPtr<xmlNode>::type node) {
+  xml::ScopedXmlPtr<xmlDoc>::type doc(xmlNewDoc(BAD_CAST ""));
+
+  // Because you cannot easily get the string format of a xmlNodePtr, it gets
+  // attached to a temporary xml doc.
+  xmlDocSetRootElement(doc.get(), node.release());
+  std::string doc_str = GetDocAsFlatString(doc.get());
+
+  // GetDocAsFlatString() adds
+  // <?xml version="" encoding="UTF-8"?>
+  // to the first line. So this removes the first line.
+  const size_t first_newline_char_pos = doc_str.find('\n');
+  DCHECK_NE(first_newline_char_pos, std::string::npos);
+  return doc_str.substr(first_newline_char_pos + 1);
+}
+
+}  // namespace
+
+TEST(Representation, AddContentProtectionXml) {
+  static const char kExpectedRepresentaionString[] =
+      "<Representation>\n\
+        <ContentProtection \
+          a=\"1\" \
+          b=\"2\" \
+          schemeIdUri=\"http://www.foo.com/drm\" \
+          value=\"somevalue\">\n\
+            <TestSubElement c=\"3\" d=\"4\"/>\n\
+        </ContentProtection>\n\
+      </Representation>";
+
+  MediaInfo media_info;
+  MediaInfo::ContentProtectionXml* content_protection_xml =
+      media_info.add_content_protections();
+  content_protection_xml->set_scheme_id_uri("http://www.foo.com/drm");
+  content_protection_xml->set_value("somevalue");
+  AddAttribute("a", "1", content_protection_xml);
+  AddAttribute("b", "2", content_protection_xml);
+
+  MediaInfo::ContentProtectionXml::Element* subelement =
+      content_protection_xml->add_subelements();
+  subelement->set_name("TestSubElement");
+  AddAttribute("c", "3", subelement);
+  AddAttribute("d", "4", subelement);
+
+  RepresentationXmlNode representation;
+  ASSERT_TRUE(
+      representation.AddContentProtectionElementsFromMediaInfo(media_info));
+
+  std::string representation_xml_string =
+      GetStringFormat(representation.PassScopedPtr());
+  // Compare with expected output (both flattened).
+  ASSERT_EQ(CollapseWhitespaceASCII(kExpectedRepresentaionString, true),
+            CollapseWhitespaceASCII(representation_xml_string, true));
+}
+
+}  // namespace xml
+}  // namespace dash_packager
diff --git a/mpd/mpd.gyp b/mpd/mpd.gyp
index df4f1aaad3..600388076c 100644
--- a/mpd/mpd.gyp
+++ b/mpd/mpd.gyp
@@ -55,6 +55,7 @@
       'type': 'executable',
       'sources': [
         'base/mpd_builder_unittest.cc',
+        'base/xml/xml_node_unittest.cc',
       ],
       'dependencies': [
         '../base/base.gyp:base',