[Gamersyde] Improved robustness, added duration and tests

Fix for Json syntax is now less error prone for Json syntax inside of
values. Extractor is now also using native Json handling. Added tests
for several videos that were producing errors in the first place.

youtube_dl/extractor/gamersyde.py

@@ -8,7 +8,6 @@ from .common import InfoExtractor
 
 class GamersydeIE(InfoExtractor):
     _VALID_URL = r'https?://(?:www\.)?gamersyde\.com/hqstream_'
-    _TEST = {
         'url': 'http://www.gamersyde.com/hqstream_bloodborne_birth_of_a_hero-34371_en.html',
         'md5': 'f38d400d32f19724570040d5ce3a505f',
         'info_dict': {
@@ -17,6 +16,11 @@ class GamersydeIE(InfoExtractor):
             'title': 'Bloodborne - Birth of a hero',
             'thumbnail': 're:^https?://.*\.jpg$',
         }
+    },
+    {
+        'url': 'http://www.gamersyde.com/hqstream_dark_souls_ii_scholar_of_the_first_sin_gameplay_part_1-34417_en.html',
+        'info_dict': {
+            'ext': 'mp4',
     }
 
     def _calculateDuration(self, durationString):
@@ -27,7 +31,6 @@ class GamersydeIE(InfoExtractor):
 
         json = re.sub(r"{\s*(\w)", r'{"\1', json)
         json = re.sub(r",\s*(\w)", r',"\1', json)
-        json = re.sub(r"(\w): ", r'\1":', json)
         json = re.sub(r",\s*}", "}", json, flags=re.DOTALL)
         json = re.sub(r",\s*]", "]", json, flags=re.DOTALL)
 
@@ -40,7 +43,6 @@ class GamersydeIE(InfoExtractor):
 
         filesJson = self._search_regex(r'playlist: (.*?)\}\);', webpage, 'files', flags=re.DOTALL)
         filesJson = self._fixJsonSyntax(filesJson)
-
         data = json.loads(filesJson)
         playlist = data[0]