fix: failed to load overall pick_order strategy in parameters_setting

examples/hrp/parameters_test.json

@@ -9,14 +9,14 @@
       "username-password": "${parameterize($file)}"
     },
     "parameters_setting": {
+      "pick_order": "random",
       "strategies": {
         "user_agent": {
           "name": "user-identity",
           "pick_order": "sequential"
         },
         "username-password": {
-          "name": "user-info",
-          "pick_order": "random"
+          "name": "user-info"
         }
       },
       "limit": 6

examples/hrp/parameters_test.yaml

@@ -4,13 +4,13 @@ config:
     user_agent: [ "iOS/10.1", "iOS/10.2" ]
     username-password: ${parameterize($file)}
   parameters_setting:
+    pick_order: "random"
     strategies:
       user_agent:
         name: "user-identity"
         pick_order: "sequential"
       username-password:
         name: "user-info"
-        pick_order: "random"
     limit: 6
   variables:
     app_version: v1

hrp/parameters.go

@@ -12,7 +12,7 @@ import (
 )
 
 type TParamsConfig struct {
-	PickOrder  iteratorPickOrder           `json:"strategy,omitempty" yaml:"strategy,omitempty"`     // overall pick-order strategy
+	PickOrder  iteratorPickOrder           `json:"pick_order,omitempty" yaml:"pick_order,omitempty"` // overall pick-order strategy
 	Strategies map[string]iteratorStrategy `json:"strategies,omitempty" yaml:"strategies,omitempty"` // individual strategies for each parameters
 	Limit      int                         `json:"limit,omitempty" yaml:"limit,omitempty"`
 }
@@ -69,7 +69,7 @@ func newParametersIterator(parameters map[string]Parameters, config *TParamsConf
 	for paramName := range parameters {
 		// check parameter individual pick order strategy
 		strategy, ok := config.Strategies[paramName]
-		if !ok {
+		if !ok || strategy.PickOrder == "" {
 			// default to overall pick order strategy
 			strategy.PickOrder = config.PickOrder
 		}