public function testGetUniqueFields()
 {
     $uniqueFieldsReflection = new \ReflectionProperty('Magento\\Framework\\Model\\ResourceModel\\Db\\AbstractDb', '_uniqueFields');
     $uniqueFieldsReflection->setAccessible(true);
     $uniqueFieldsReflection->setValue($this->_model, null);
     $this->assertEquals([], $this->_model->getUniqueFields());
 }