}
	if readHash.Sum32() != wroteHash.Sum32() {
		t.Fatalf("expect read hash 0x%08x but got 0x%08x", readHash.Sum32(), wroteHash.Sum32())
	}
}

func TestRingBuffer_BlockingBig(t *testing.T) {
	// Typical runtime is ~5-10s.
	defer timeout(60 * time.Second)()
	const debug = false

	var readBytes int
	var wroteBytes int
	readHash := crc32.NewIEEE()