MAGETWO-96534: Changing random string generation

Author: Mark Berube

app/code/Magento/Captcha/Model/DefaultModel.php

@@ -378,6 +378,16 @@ protected function _generateWord()
         return $this->randomMath->getRandomString($wordLen, $symbols);
     }
 
+    /**
+     * Get symbols array to use for word generation
+     *
+     * @return array
+     */
+    protected function _getSymbols()
+    {
+        return str_split((string)$this->_captchaData->getConfig('symbols'));
+    }
+
     /**
      * Returns length for generating captcha word. This value may be dynamic.
      *

app/code/Magento/Captcha/Test/Unit/Model/DefaultTest.php

@@ -405,7 +405,7 @@ public function testGenerateWord($string)
     /**
      * @return array
      */
-    public function GenerateWordProvider()
+    public function generateWordProvider()
     {
         return [
             ['ABC123'],