Issue #3502216: Create a new Unit test for EmailValidator validation plugin

Related to #3502216

src/Plugin/FapiValidationValidator/EmailValidator.php

@@ -23,7 +23,7 @@ class EmailValidator implements FapiValidationValidatorsInterface {
    * {@inheritdoc}
    */
   public function validate(Validator $validator, array $element, FormStateInterface $form_state) {
-    return fapi_validation_validate_email($validator->getValue());
+    return \fapi_validation_validate_email($validator->getValue());
   }
 
 }