YugabyteDB (2.13.0.0-b42, bfc6a6643e7399ac8a0e81d06a3ee6d6571b33ab)

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#include <glog/logging.h>

#include <gtest/gtest.h>

#include "yb/server/logical_clock.h"

#include "yb/util/monotime.h"

#include "yb/util/test_util.h"

namespace yb {

namespace server {

class LogicalClockTest : public YBTest {

 public:

  LogicalClockTest()

      : clock_(LogicalClock::CreateStartingAt(HybridTime::kInitial)) {

  }

 protected:

  scoped_refptr<LogicalClock> clock_;

};

// Test that two subsequent time reads are monotonically increasing.

TEST_F(LogicalClockTest, TestNow_ValuesIncreaseMonotonically) {

  const HybridTime now1 = clock_->Now();

  const HybridTime now2 = clock_->Now();

  ASSERT_EQ(now1.value() + 1, now2.value());

}

// Tests that the clock gets updated if the incoming value is higher.

TEST_F(LogicalClockTest, TestUpdate_LogicalValueIncreasesByAmount) {

  HybridTime initial = clock_->Now();

  HybridTime future(initial.value() + 10);

  clock_->Update(future);

  HybridTime now = clock_->Now();

  // now should be 1 after future

  ASSERT_EQ(initial.value() + 11, now.value());

}

// Tests that the clock doesn't get updated if the incoming value is lower.

TEST_F(LogicalClockTest, TestUpdate_LogicalValueDoesNotIncrease) {

  HybridTime ht(1);

  // update the clock to 1, the initial value, should do nothing

  clock_->Update(ht);

  HybridTime now = clock_->Now();

  ASSERT_EQ(now.value(), 2);

}

}  // namespace server

}  // namespace yb