ACQE-2580: extra validation added

Author: Ashish.Kumar18

src/Magento/FunctionalTestingFramework/Util/TestGenerator.php

@@ -264,12 +264,16 @@ public function assembleTestPhp($testObject)
             $fileToArr = explode("\n", file_get_contents($testObject->getFilename()));
             $argArr = [];
             foreach ($fileToArr as $key => $fileVal) {
-                if (strpos($fileVal, "<argument name") == true) {
+                if (!empty(strpos($fileVal, "<argument name"))) {
                     $argArr[$key] = explode(" ", trim($fileVal))[1];
                 }
             }
             foreach ($argArr as $key => $arrVal) {
-                if (@$argArr[$key + 1] == $arrVal || @$argArr[$key - 1] == $arrVal) {
+                if (!empty($argArr[$key + 1]) && $argArr[$key + 1] === $arrVal ) {
+                    $err[] = 'Duplicate argument name '.$arrVal.' not allowed in helper or actionGroup';
+                    throw new TestFrameworkException(implode(PHP_EOL, $err));
+                }
+                if (!empty($argArr[$key - 1]) && $argArr[$key - 1] === $arrVal) {
                     $err[] = 'Duplicate argument name '.$arrVal.' not allowed in helper or actionGroup';
                     throw new TestFrameworkException(implode(PHP_EOL, $err));
                 }