func TestHistogramRotate(t *testing.T) {
defer TestingSetNow(nil)()
setNow(0)
h := NewHistogram(histWrapNum*time.Second, 1000+10*histWrapNum, 3)
var cur time.Duration
for i := 0; i < 3*histWrapNum; i++ {
v := int64(10 * i)
h.RecordValue(v)
cur += time.Second
setNow(cur)
cur := h.Current()
// When i == histWrapNum-1, we expect the entry from i==0 to move out
// of the window (since we rotated for the histWrapNum'th time).
expMin := int64((1 + i - (histWrapNum - 1)) * 10)
if expMin < 0 {
expMin = 0
}
if min := cur.Min(); min != expMin {
t.Fatalf("%d: unexpected minimum %d, expected %d", i, min, expMin)
}
if max, expMax := cur.Max(), v; max != expMax {
t.Fatalf("%d: unexpected maximum %d, expected %d", i, max, expMax)
}
}
}