Add tests that check the 'id' attributes.

Change-Id: I487ec7c658fd5a3a8bae03800e23b37cc44066f4

mpd/base/mpd_builder_unittest.cc

@@ -6,12 +6,59 @@
 
 #include "base/file_util.h"
 #include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
 #include "mpd/base/mpd_builder.h"
 #include "mpd/test/mpd_builder_test_helper.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/libxml/src/include/libxml/xmlstring.h"
 
 namespace dash_packager {
 
+namespace {
+// Get 'id' attribute from |node|, convert it to std::string and convert it to a
+// number.
+void ExpectXmlElementIdEqual(xmlNodePtr node, uint32 id) {
+  const char kId[] = "id";
+  xml::ScopedXmlPtr<xmlChar>::type id_attribute_xml_str(
+      xmlGetProp(node, BAD_CAST kId));
+  ASSERT_TRUE(id_attribute_xml_str);
+
+  unsigned id_attribute_unsigned = 0;
+  std::string id_attribute_str =
+      reinterpret_cast<const char*>(id_attribute_xml_str.get());
+  ASSERT_TRUE(base::StringToUint(id_attribute_str, &id_attribute_unsigned));
+
+  ASSERT_EQ(id, id_attribute_unsigned);
+}
+
+// Using template to support both AdaptationSet and Representation.
+template <typename T>
+void CheckIdEqual(uint32 expected_id, T* node) {
+  ASSERT_EQ(expected_id, node->id());
+
+  // Also check if the XML generated by libxml2 has the correct id attribute.
+  xml::ScopedXmlPtr<xmlNode>::type node_xml(node->GetXml());
+  ASSERT_NO_FATAL_FAILURE(ExpectXmlElementIdEqual(node_xml.get(), expected_id));
+}
+}  // namespace
+
+TEST(AdaptationSetTest, CheckId) {
+  base::AtomicSequenceNumber sequence_counter;
+  const uint32 kAdaptationSetId = 42;
+
+  AdaptationSet adaptation_set(kAdaptationSetId, &sequence_counter);
+  ASSERT_NO_FATAL_FAILURE(CheckIdEqual(kAdaptationSetId, &adaptation_set));
+}
+
+TEST(RepresentationTest, CheckId) {
+  const MediaInfo video_media_info = GetTestMediaInfo(kFileNameVideoMediaInfo1);
+  const uint32 kRepresentationId = 1;
+
+  Representation representation(video_media_info, kRepresentationId);
+  EXPECT_TRUE(representation.Init());
+  ASSERT_NO_FATAL_FAILURE(CheckIdEqual(kRepresentationId, &representation));
+}
+
 class StaticMpdBuilderTest : public ::testing::Test {
  public:
   StaticMpdBuilderTest() : mpd_(MpdBuilder::kStatic) {}