1 files changed, 40 insertions, 0 deletions
diff --git a/ethutil/trie_test.go b/ethutil/trie_test.go
new file mode 100644
index 000000000..b87d35e1a
--- /dev/null
+++ b/ethutil/trie_test.go
@@ -0,0 +1,40 @@
+package ethutil
+
+import (
+	_ "encoding/hex"
+	_ "fmt"
+	"testing"
+)
+
+type MemDatabase struct {
+	db map[string][]byte
+}
+
+func NewMemDatabase() (*MemDatabase, error) {
+	db := &MemDatabase{db: make(map[string][]byte)}
+	return db, nil
+}
+func (db *MemDatabase) Put(key []byte, value []byte) {
+	db.db[string(key)] = value
+}
+func (db *MemDatabase) Get(key []byte) ([]byte, error) {
+	return db.db[string(key)], nil
+}
+func (db *MemDatabase) Print()              {}
+func (db *MemDatabase) Close()              {}
+func (db *MemDatabase) LastKnownTD() []byte { return nil }
+
+func TestTrieSync(t *testing.T) {
+	db, _ := NewMemDatabase()
+	trie := NewTrie(db, "")
+
+	trie.Update("dog", "kindofalongsentencewhichshouldbeencodedinitsentirety")
+	if len(db.db) != 0 {
+		t.Error("Expected no data in database")
+	}
+
+	trie.Sync()
+	if len(db.db) == 0 {
+		t.Error("Expected data to be persisted")
+	}
+}