/**
  * Assert that success message is displayed after tax rule saved.
  *
  * @param TaxRuleIndex $taxRuleIndex
  * @return void
  */
 public function processAssert(TaxRuleIndex $taxRuleIndex)
 {
     \PHPUnit_Framework_Assert::assertEquals(self::SUCCESS_MESSAGE, $taxRuleIndex->getMessagesBlock()->getSuccessMessages());
 }