You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: timestamp_to_versionstamp.rs
    path of file: ./repos/surrealdb/core/src/kvs/tests
    
    the code of the file until where you have to start completion: // Timestamp to versionstamp tests
// This translation mechanism is currently used by the garbage collector to determine which change feed entries to delete.
//
// FAQ:
// Q: Whatâ€™s the difference between database TS and database VS?
// A: Timestamps are basically seconds since the unix epoch.
//    Versionstamps can be anything that is provided by our TSO.
// Q: Why do we need to translate timestamps to versionstamps?
// A: The garbage collector needs to know which change feed entries to delete.
//    However our SQL syntax `DEFINE DATABASE foo CHANGEFEED 1h` let the user specify the expiration in a duration, not a delta in the versionstamp.
//    We need to translate the timestamp to the versionstamp due to 
    
async fn timestamp_to_versionstamp() {
	// Create a new datastore
	let node_id = Uuid::parse_str("A905CA25-56ED-49FB-B759-696AEA87C342").unwrap();
	let clock = Arc::new(SizedClock::Fake(FakeClock::new(Timestamp::default())));
	let (ds, _) = new_ds(node_id, clock).await;
	// Give the current versionstamp a timestamp of 0
	let mut tx = ds.transaction(Write, Optimistic).await.unwrap();
	tx.set_timestamp_for_versionstamp(0, "myns", "mydb", true).await.unwrap();
	tx.commit().await.unwrap();
	// Get the versionstamp for timestamp 0
	let mut tx = ds.transaction(Write, Optimistic).await.unwrap();
	let vs1 = tx.get_versionstamp_from_timestamp(0, "myns", "mydb", true).await.unwrap().unwrap();
	tx.commit().await.unwrap();
	// Give the current versionstamp a timestamp of 1
	let mut tx = ds.transaction(Write, Optimistic).await.unwrap();
	tx.set_timestamp_for_versionstamp(1, "myns", "mydb", true).await.unwrap();
	tx.commit().await.unwrap();
	// Get the versionstamp for timestamp 1
	let mut tx = ds.transaction(Write, Optimistic).await.unwrap();
	let vs2 = tx.get_versionstamp_from_timestamp(1, "myns", "mydb", true).await.unwrap().unwrap();
	tx.commit().await.unwrap();
	// Give the current versionstamp a timestamp of 2
	let mut tx = ds.transaction(Write, Optimistic).await.unwrap();
	tx.set_timestamp_for_versionstamp(2, "myns", "mydb", true).await.unwrap();
	tx.commit().await.unwrap();
	// Get the versionstamp for timestamp 2
	let mut tx = ds.transaction(Write, Optimistic).await.unwrap();
	let vs3 = tx.get_versionstamp_from_timestamp(2, "myns", "mydb", true).await.unwrap().unwrap();
	tx.commit().await.unwrap();
	assert!(vs1 < vs2);
	assert!(vs2 < vs3);
}