Fall back to non-locked tests on systems without interprocess locking permission (eg. Travis).

tests/test_comics.py

@@ -54,8 +54,12 @@ class _ComicTester(TestCase):
         scraperobj = self.scraperclass()
         # Limit number of connections to one host.
         host = get_host(scraperobj.url)
+        try:
             with get_lock(host):
                 self._test_comic(scraperobj)
+        except OSError:
+            # interprocess lock not supported
+            self._test_comic(scraperobj)
 
     def _test_comic(self, scraperobj):
         num = 0