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#include "base/atomic.h"

#include "base/lock.h"
#include "testing/gtest/include/gtest/gtest.h"

TEST(AtomicTest, Increment) {
  int32 value = 38;
  int32 new_value = base::AtomicIncrement(&value);
  EXPECT_EQ(39, value);
  EXPECT_EQ(39, new_value);
}

TEST(AtomicTest, Decrement) {
  int32 value = 49;
  int32 new_value = base::AtomicDecrement(&value);
  EXPECT_EQ(48, value);
  EXPECT_EQ(48, new_value);
}

TEST(AtomicTest, Swap) {
  int32 value = 38;
  int32 old_value = base::AtomicSwap(&value, 49);
  EXPECT_EQ(49, value);
  EXPECT_EQ(38, old_value);

  // Now do another test.
  value = 0;
  old_value = base::AtomicSwap(&value, 1);
  EXPECT_EQ(0, old_value);
  old_value = base::AtomicSwap(&value, 1);
  EXPECT_EQ(1, old_value);
  old_value = base::AtomicSwap(&value, 1);
  EXPECT_EQ(1, old_value);
}