Fix test

Author: zyc9012

tests/serpapi_test.ts

@@ -90,6 +90,7 @@ describe("getAccount", {
       "extra_credits",
       "last_hour_searches",
       "plan_id",
+      "plan_monthly_price",
       "plan_name",
       "plan_searches_left",
       "searches_per_month",
@@ -113,6 +114,7 @@ describe("getAccount", {
       "extra_credits",
       "last_hour_searches",
       "plan_id",
+      "plan_monthly_price",
       "plan_name",
       "plan_searches_left",
       "searches_per_month",
@@ -135,6 +137,7 @@ describe("getAccount", {
       "extra_credits",
       "last_hour_searches",
       "plan_id",
+      "plan_monthly_price",
       "plan_name",
       "plan_searches_left",
       "searches_per_month",