Speed up tests (#638)

sith/testrunner.py

@@ -0,0 +1,9 @@
+from django.core.management import call_command
+from django.test.runner import DiscoverRunner
+
+
+class SithTestRunner(DiscoverRunner):
+    def setup_databases(self, **kwargs):
+        res = super().setup_databases(**kwargs)
+        call_command("populate")
+        return res