Test case for #21.

meter_test.go

@@ -1,6 +1,9 @@
 package metrics
 
-import "testing"
+import (
+	"testing"
+	"time"
+)
 
 func TestMeterZero(t *testing.T) {
 	m := NewMeter()
@@ -16,3 +19,18 @@ func TestMeterNonzero(t *testing.T) {
 		t.Errorf("m.Count(): 3 != %v\n", count)
 	}
 }
+
+func TestMeterDecay(t *testing.T) {
+	m := &StandardMeter{
+		make(chan int64),
+		make(chan meterV),
+		time.NewTicker(1),
+	}
+	go m.arbiter()
+	m.Mark(1)
+	rateMean := m.RateMean()
+	time.Sleep(1)
+	if m.RateMean() >= rateMean {
+		t.Error("m.RateMean() didn't decrease")
+	}
+}