set a default connection string

src/test/appsettings.Development.json

@@ -43,7 +43,10 @@
         }
     },
     "Data": {
-        "DevConnection": {
+      "DefaultConnection": {
+        "ConnectionString": "Server=localhost;Port=5432;Database=YavscDev;Username=yavscdev;Password=admin;"
+      },
+      "DevConnection": {
             "Database":"postgres",
             "Server": "localhost",
             "Port": 5432,