refactor(all): add test file

data/reports/violin/violin_style1.json

 [
 [
   {
   {
     "name": "total_bill",
     "name": "total_bill",
+    "x_series": "day",
+    "y_series": "total_bill",
     "points": "none",
     "points": "none",
     "box": {
     "box": {
       "visible": true
       "visible": true