public void Snapshot()
{
using var log = Log();
using LevelDB.DB <string, string> db = GetTestDb();
IIterable <string, string> it = db.GetIterable().Snapshot();
db.Delete("a").Delete("c").Delete("m").Delete("n");
Assert.Equal(
"a=1;b=2;c=3;l=12;m=13;n=14;x=24;y=25;z=26",
string.Join(";", it.Select(kv => $"{kv.Key}={kv.Value}")));
it.Snapshot();
Assert.Equal(
"b=2;l=12;x=24;y=25;z=26",
string.Join(";", it.Select(kv => $"{kv.Key}={kv.Value}")));
}