Bug 1307016 - Have puppeteer __str__ encode fields to ascii. r=maja_zf

At least some of the environments the tests are running in do not appear to play
nice with non-ascii characters. Some of the jenkins runs are currently unhappy
due to this. This patch sees that all fields are encoded as ascii with
non-compatible characters replaced.

MozReview-Commit-ID: 6qSCyUujMLE

--HG--
extra : rebase_source : bb19b261b10aeb9bb9a47a2d47fefc7604000430

dom/media/test/external/external_media_tests/media_utils/video_puppeteer.py

@@ -405,9 +405,10 @@ class VideoPuppeteer(object):
         messages += ['\ttimeout: {}'.format(self.timeout)]
         # Print each field on its own line
         for field in self._last_seen_video_state._fields:
-            messages += [('\t{}: {}'
-                          .format(field, getattr(self._last_seen_video_state,
-                                                 field)))]
+            # For compatibility with different test environments we force ascii
+            field_ascii = (str(getattr(self._last_seen_video_state, field))
+                           .encode('ascii','replace'))
+            messages += [('\t{}: {}'.format(field, field_ascii))]
         messages += '}'
         return '\n'.join(messages)
 

dom/media/test/external/external_media_tests/media_utils/youtube_puppeteer.py

@@ -484,8 +484,9 @@ class YouTubePuppeteer(VideoPuppeteer):
             return '\n'.join(messages)
         messages += ['.html5-media-player: {']
         for field in self._last_seen_player_state._fields:
-            messages += [('\t{}: {}'
-                          .format(field, getattr(self._last_seen_player_state,
-                                                 field)))]
+            # For compatibility with different test environments we force ascii
+            field_ascii = (str(getattr(self._last_seen_video_state, field))
+                           .encode('ascii', 'replace'))
+            messages += [('\t{}: {}'.format(field, field_ascii))]
         messages += '}'
         return '\n'.join(messages)