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Minimal test - lines (49, 65)

Code

TEST(AutoRefCnt, ThreadSafeAutoRefCntBalance)
{
  static const size_t kThreadCount = 4;
  nsCOMPtr threads[kThreadCount];
  for (size_t i = 0; i < kThreadCount; i++) {
    nsresult rv =
        NS_NewNamedThread("AutoRefCnt Test", getter_AddRefs(threads[i]),
                          new nsThreadSafeAutoRefCntRunner);
    EXPECT_TRUE(NS_SUCCEEDED(rv));
  }
  for (size_t i = 0; i < kThreadCount; i++) {
    threads[i]->Shutdown();
  }
  EXPECT_EQ(nsThreadSafeAutoRefCntRunner::sRefCnt, nsrefcnt(0));
  EXPECT_EQ(nsThreadSafeAutoRefCntRunner::sIncToOne,
            nsThreadSafeAutoRefCntRunner::sDecToZero);
}

Minimal test - lines (17, 39)

Code

class nsThreadSafeAutoRefCntRunner final : public Runnable {
 public:
  NS_IMETHOD Run() final {
    for (int i = 0; i < 10000; i++) {
      if (++sRefCnt == 1) {
        sIncToOne++;
      }
      if (--sRefCnt == 0) {
        sDecToZero++;
      }
    }
    return NS_OK;
  }

  static ThreadSafeAutoRefCnt sRefCnt;
  static Atomic sIncToOne;
  static Atomic sDecToZero;

  nsThreadSafeAutoRefCntRunner() : Runnable("nsThreadSafeAutoRefCntRunner") {}

 private:
  ~nsThreadSafeAutoRefCntRunner() = default;
};