def test_insert_delete():
for a in (5, 15, 60):
db = RefcountDB(EphemDB())
NODES = a
t1 = pruning_trie.Trie(db)
db.ttl = 0
db.logging = True
for i in range(NODES):
t1.update(to_string(i), to_string(i))
db.commit_refcount_changes(i)
db.cleanup(i)
check_db_tightness([t1], db)
for i in range(NODES):
t1.delete(to_string(NODES - 1 - i))
db.commit_refcount_changes(NODES + i)
db.cleanup(NODES + i)
check_db_tightness([t1], db)
assert len(db.kv) == 0