diff --git a/memmetrics/counter_test.go b/memmetrics/counter_test.go
index 5218358..b694fb1 100644
--- a/memmetrics/counter_test.go
+++ b/memmetrics/counter_test.go
@@ -1,6 +1,7 @@
 package memmetrics
 
 import (
+	"math"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -28,21 +29,24 @@ func TestCloneExpired(t *testing.T) {
 	assert.EqualValues(t, 2, out.Count())
 }
 
-func TestCleanup(t *testing.T) {
+func Test_cleanup(t *testing.T) {
 	clock.Freeze(clock.Date(2012, 3, 4, 5, 6, 7, 0, clock.UTC))
 
 	cnt, err := NewCounter(10, clock.Second)
 	require.NoError(t, err)
 
 	cnt.Inc(1)
+
 	for i := 0; i < 9; i++ {
 		clock.Advance(clock.Second)
-		cnt.Inc(1)
+		cnt.Inc(int(math.Pow10(i + 1)))
 	}
-	// cnt will be  [1 1 1 1 1 1 1 1 1 1]
+
+	assert.EqualValues(t, 1111111111, cnt.Count())
+	assert.Equal(t, []int{1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000, 1, 10, 100}, cnt.values)
 
 	clock.Advance(9 * clock.Second)
-	assert.EqualValues(t, 1, cnt.Count())
-	// cnt will be  [0 0 0 0 0 0 1 0 0 0]
-	// old behavior [1 1 0 1 0 0 1 1 1 0]
+
+	assert.EqualValues(t, 1000000000, cnt.Count())
+	assert.EqualValues(t, []int{0, 0, 0, 0, 0, 0, 1000000000, 0, 0, 0}, cnt.values)
 }