text: #include <catboost/libs/data/order.h>
  
  #include <library/unittest/registar.h>
  
  
  using namespace NCB;
  
  
  Y_UNIT_TEST_SUITE(EObjectsOrder) {
      Y_UNIT_TEST(Combine) {
          UNIT_ASSERT_VALUES_EQUAL(
              Combine(EObjectsOrder::Ordered, EObjectsOrder::Ordered),
              EObjectsOrder::Ordered
          );
          UNIT_ASSERT_VALUES_EQUAL(
              Combine(EObjectsOrder::Ordered, EObjectsOrder::RandomShuffled),
              EObjectsOrder::RandomShuffled
          );
          UNIT_ASSERT_VALUES_EQUAL(
              Combine(EObjectsOrder::Ordered, EObjectsOrder::Undefined),
              EObjectsOrder::Undefined
          );
          UNIT_ASSERT_VALUES_EQUAL(
              Combine(EObjectsOrder::RandomShuffled, EObjectsOrder::Ordered),
              EObjectsOrder::RandomShuffled
          );
          UNIT_ASSERT_VALUES_EQUAL(
              Combine(EObjectsOrder::RandomShuffled, EObjectsOrder::RandomShuffled),
              EObjectsOrder::RandomShuffled
          );
          UNIT_ASSERT_VALUES_EQUAL(
              Combine(EObjectsOrder::RandomShuffled, EObjectsOrder::Undefined),
              EObjectsOrder::RandomShuffled
          );
          UNIT_ASSERT_VALUES_EQUAL(
              Combine(EObjectsOrder::Undefined, EObjectsOrder::Ordered),
              EObjectsOrder::Undefined
          );
          UNIT_ASSERT_VALUES_EQUAL(
              Combine(EObjectsOrder::Undefined, EObjectsOrder::RandomShuffled),
              EObjectsOrder::RandomShuffled
          );
          UNIT_ASSERT_VALUES_EQUAL(
              Combine(EObjectsOrder::Undefined, EObjectsOrder::Undefined),
              EObjectsOrder::Undefined
          );
      }
  }
  
  