MQE-486: action groups errors with parameterized selectors and array data

- fixed regexPattern for variables to include [] for cases like {{arg.street[0]}}
- added check for $variableName = null
- fixed camel casing issue with array key

Author: KevinBKozan

src/Magento/FunctionalTestingFramework/DataGenerator/Handlers/DataObjectHandler.php

@@ -201,7 +201,7 @@ private function parseDataEntities()
                         $arrayValues[] = $arrayValue[self::ARRAY_ELEMENT_ITEM_VALUE];
                     }
 
-                    $dataValues[$arrayKey] = $arrayValues;
+                    $dataValues[strtolower($arrayKey)] = $arrayValues;
                 }
             }
 

src/Magento/FunctionalTestingFramework/Test/Objects/ActionGroupObject.php

@@ -84,7 +84,7 @@ private function getResolvedActionsWithArgs($arguments, $actionReferenceKey)
         // $regexPattern match on:   $matches[0] {{section.element(arg.field)}}
         // $matches[1] = section.element
         // $matches[2] = arg.field
-        $regexPattern = '/{{([\w.]+)\(*([\w.$\']+)*\)*}}/';
+        $regexPattern = '/{{([\w.\[\]]+)\(*([\w.$\']+)*\)*}}/';
 
         foreach ($this->parsedActions as $action) {
             $varAttributes = array_intersect(self::VAR_ATTRIBUTES, array_keys($action->getCustomActionAttributes()));
@@ -140,10 +140,10 @@ private function replaceAttributeArguments($arguments, $attributeValue, $matches
                 if (empty($variable)) {
                     continue;
                 }
-                // Truncate arg.field into arg
+                // Truncate arg.field into arg. If 'Literal' was passed, variableName will be null.
                 $variableName = strstr($variable, '.', true);
                 // Check if arguments has a mapping for the given variableName
-                if (!array_key_exists($variableName, $arguments)) {
+                if ($variableName == null || !array_key_exists($variableName, $arguments)) {
                     continue;
                 }
                 $isPersisted = strstr($arguments[$variableName], '$');