Bubble up all the stack of exceptions and retry download tests on timeout errors

test/test_download.py

@@ -20,6 +20,8 @@ from youtube_dl.utils import *
 DEF_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'tests.json')
 PARAMETERS_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "parameters.json")
 
+RETRIES = 3
+
 # General configuration (from __init__, not very elegant...)
 jar = compat_cookiejar.CookieJar()
 cookie_processor = compat_urllib_request.HTTPCookieProcessor(jar)
@@ -94,7 +96,19 @@ def generator(test_case):
             _try_rm(tc['file'] + '.part')
             _try_rm(tc['file'] + '.info.json')
         try:
-            fd.download([test_case['url']])
+            for retry in range(1, RETRIES + 1):
+                try:
+                    fd.download([test_case['url']])
+                except (DownloadError, ExtractorError) as err:
+                    if retry == RETRIES: raise
+
+                    # Check if the exception is not a network related one
+                    if not err.exc_info[0] in (ZeroDivisionError, compat_urllib_error.URLError, socket.timeout):
+                        raise
+
+                    print('Retrying: {0} failed tries\n\n##########\n\n'.format(retry))
+                else:
+                    break
 
             for tc in test_cases:
                 if not test_case.get('params', {}).get('skip_download', False):