From 49ef9a1aa426e36282fbea2c7dc080d75422ee16 Mon Sep 17 00:00:00 2001
From: Robert Habermeier <rphmeier@gmail.com>
Date: Fri, 21 Oct 2016 20:36:40 +0200
Subject: [PATCH] Add empty account existence test from beta. (#2769)

* add bloom filter existence test from beta

* fix U256 instantiation for master
---
 ethcore/src/state/mod.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/ethcore/src/state/mod.rs b/ethcore/src/state/mod.rs
index e84a96ac2..b4e9178f1 100644
--- a/ethcore/src/state/mod.rs
+++ b/ethcore/src/state/mod.rs
@@ -1671,6 +1671,21 @@ fn remove() {
 	assert_eq!(state.nonce(&a), U256::from(0u64));
 }
 
+#[test]
+fn empty_account_exists() {
+	let a = Address::zero();
+	let path = RandomTempPath::new();
+	let db = get_temp_state_db_in(path.as_path());
+	let (root, db) = {
+		let mut state = State::new(db, U256::from(0), Default::default());
+		state.add_balance(&a, &U256::default()); // create an empty account
+		state.commit().unwrap();
+		state.drop()
+	};
+	let state = State::from_existing(db, root, U256::from(0u8), Default::default()).unwrap();
+	assert!(state.exists(&a));
+}
+
 #[test]
 fn remove_from_database() {
 	let a = Address::zero();