diff --git a/p2c/least_loaded_test.go b/p2c/least_loaded_test.go
index 5a45b3c..7121edb 100644
--- a/p2c/least_loaded_test.go
+++ b/p2c/least_loaded_test.go
@@ -11,6 +11,7 @@ import (
 func TestLeastLoaded(t *testing.T) {
 	t.Run("0 item", func(t *testing.T) {
 		ll := p2c.NewLeastLoaded()
+		ll.Reset()
 		item, done := ll.Next()
 		done(balancer.DoneInfo{})
 		assert.Nil(t, item)
diff --git a/p2c/pewma_test.go b/p2c/pewma_test.go
index db8ede5..8d25965 100644
--- a/p2c/pewma_test.go
+++ b/p2c/pewma_test.go
@@ -50,6 +50,7 @@ func TestPeakEwma(t *testing.T) {
 
 	t.Run("1 item", func(t *testing.T) {
 		ll := NewPeakEwma()
+		ll.Reset()
 		ll.Add(1, 1)
 		item, done := ll.Next()
 		done(balancer.DoneInfo{})
diff --git a/roundrobin/roundrobin.go b/roundrobin/smooth_weighted.go
similarity index 100%
rename from roundrobin/roundrobin.go
rename to roundrobin/smooth_weighted.go
diff --git a/roundrobin/roundrobin_test.go b/roundrobin/smooth_weighted_test.go
similarity index 81%
rename from roundrobin/roundrobin_test.go
rename to roundrobin/smooth_weighted_test.go
index 005f2b1..47824ce 100644
--- a/roundrobin/roundrobin_test.go
+++ b/roundrobin/smooth_weighted_test.go
@@ -37,4 +37,8 @@ func TestSW_Next(t *testing.T) {
 	if results["server1"] != 500 || results["server2"] != 200 || results["server3"] != 300 {
 		t.Error("the algorithm is wrong")
 	}
+
+	w.(*smoothRoundrobin).items[0].EffectiveWeight = w.(*smoothRoundrobin).items[0].CurrentWeight - 1
+	s, _ = w.Next()
+	assert.Equal(t, "server3", s.(string))
 }