Add code to test SubmissionQueue::sync()

Add code to test SubmissionQueue::sync().

Signed-off-by: Liu Jiang <[email protected]>

Author: jiangliu

io-uring-test/src/tests/queue.rs

@@ -12,7 +12,9 @@ pub fn test_nop(ring: &mut IoUring, test: &Test) -> anyhow::Result<()> {
 
     unsafe {
         let mut queue = ring.submission();
+        assert_eq!(queue.len(), 0);
         queue.push(&nop_e).expect("queue is full");
+        assert_eq!(queue.len(), 1);
     }
 
     ring.submit_and_wait(1)?;
@@ -23,6 +25,12 @@ pub fn test_nop(ring: &mut IoUring, test: &Test) -> anyhow::Result<()> {
     assert_eq!(cqes[0].user_data(), 0x42);
     assert_eq!(cqes[0].result(), 0);
 
+    unsafe {
+        let mut queue = ring.submission();
+        queue.sync();
+        assert_eq!(queue.len(), 0);
+    }
+
     Ok(())
 }