Updated "testFirstStream" to use DiffDir

Change-Id: I8c279ba0c208f1e56d53460ae134b3ed8c5f552c

packager/app/test/packager_test.py

@@ -462,8 +462,7 @@ class PackagerFunctionalTest(PackagerAppTest):
 
   def testPackageFirstStream(self):
     self.assertPackageSuccess(self._GetStreams(['0']), self._GetFlags())
-    self._DiffGold(self.output[0], 'bear-640x360-v-golden.mp4')
-    self._DiffGold(self.mpd_output, 'bear-640x360-v-golden.mpd')
+    self._CheckTestResults('first-stream')
 
   def testPackageText(self):
     self.assertPackageSuccess(

packager/app/test/testdata/first-stream/output.mpd

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--Generated with https://github.com/google/shaka-packager version <tag>-<hash>-<test>-->
+<MPD xmlns="urn:mpeg:dash:schema:mpd:2011" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="urn:mpeg:dash:schema:mpd:2011 DASH-MPD.xsd" xmlns:cenc="urn:mpeg:cenc:2013" profiles="urn:mpeg:dash:profile:isoff-on-demand:2011" minBufferTime="PT2S" type="static" mediaPresentationDuration="PT2.73607S">
+  <Period id="0">
+    <AdaptationSet id="0" contentType="video" width="640" height="360" frameRate="30000/1001" subsegmentAlignment="true" par="16:9">
+      <Representation id="0" bandwidth="882064" codecs="avc1.64001e" mimeType="video/mp4" sar="1:1">
+        <BaseURL>output_0.mp4</BaseURL>
+        <SegmentBase indexRange="823-890" timescale="30000">
+          <Initialization range="0-822"/>
+        </SegmentBase>
+      </Representation>
+    </AdaptationSet>
+  </Period>
+</MPD>