Add more test and fmt files.

db.go

@@ -534,7 +534,7 @@ func (db *RedisDB) setUnion(keys []string) (setKey, error) {
 }
 
 // fastForward proceeds the current timestamp with duration, works as a time machine
-func (db *RedisDB) fastForward(duration time.Duration) () {
+func (db *RedisDB) fastForward(duration time.Duration) {
 	for _, key := range db.allKeys() {
 		value, ok := db.ttl[key]
 		if ok {

example_test.go

@@ -32,6 +32,14 @@ func Example() {
 	if _, err := s.DB(42).Get("foo"); err != miniredis.ErrKeyNotFound {
 		panic("Didn't use a different DB")
 	}
+
+	// Test key with expiration
+	s.SetTTL("foo", 60)
+	s.FastForward(60)
+	if _, err := s.Get("foo"); err == nil {
+		panic("Expect key expired, but still get value.")
+	}
+
 	// Or use a Check* function which Fail()s if the key is not what we expect
 	// (checks for existence, key type and the value)
 	// s.CheckGet(t, "foo", "bar")

miniredis.go

@@ -250,7 +250,7 @@ func (m *Miniredis) TotalConnectionCount() int {
 }
 
 // FastForward proceeds the time of selected db by duration.
-func (m *Miniredis) FastForward(duration time.Duration) () {
+func (m *Miniredis) FastForward(duration time.Duration) {
 	for _, db := range m.dbs {
 		db.fastForward(duration)
 	}