PHPUnit_Framework_Assert::assertEmpty PHP Method

    public static function assertEmpty($actual, $message = '')
    {
        static::assertThat($actual, static::isEmpty(), $message);
    }

 /**
  * Assert that data at the form corresponds to the fixture data
  *
  * @param SystemVariable $customVariable
  * @param SystemVariableIndex $systemVariableIndex
  * @param SystemVariableNew $systemVariableNew
  * @param Store $storeOrigin
  * @param SystemVariable $customVariableOrigin
  * @return void
  *
  * @SuppressWarnings(PHPMD.NPathComplexity)
  */
 public function processAssert(SystemVariable $customVariable, SystemVariableIndex $systemVariableIndex, SystemVariableNew $systemVariableNew, Store $storeOrigin = null, SystemVariable $customVariableOrigin = null)
 {
     // Prepare data
     $data = $customVariableOrigin === null ? $customVariable->getData() : array_merge($customVariableOrigin->getData(), $customVariable->getData());
     if ($customVariableOrigin !== null) {
         $dataOrigin = $data;
         $dataOrigin['html_value'] = $customVariableOrigin->getHtmlValue();
         $dataOrigin['plain_value'] = $customVariableOrigin->getPlainValue();
     } else {
         $dataOrigin = $data;
     }
     if ($data['html_value'] == '') {
         $data['html_value'] = $customVariableOrigin->getHtmlValue();
         $data['use_default_value'] = 'Yes';
     }
     $data['plain_value'] = $data['plain_value'] == '' ? $customVariableOrigin->getPlainValue() : $data['plain_value'];
     // Perform assert
     $systemVariableIndex->open();
     $systemVariableIndex->getSystemVariableGrid()->searchAndOpen(['code' => $data['code']]);
     $formData = $systemVariableNew->getSystemVariableForm()->getData($customVariable);
     $errors = $this->verifyData($dataOrigin, $formData);
     \PHPUnit_Framework_Assert::assertEmpty($errors, $errors);
     if ($storeOrigin !== null) {
         $systemVariableNew->getFormPageActions()->selectStoreView($storeOrigin->getName());
         $formData = $systemVariableNew->getSystemVariableForm()->getData($customVariable);
         $errors = $this->verifyData($data, $formData);
         \PHPUnit_Framework_Assert::assertEmpty($errors, $errors);
     }
 }