func TestAddAndPushOnePeriod(t *testing.T) {
	a := &TestAggregator{}
	ra := NewRunningAggregator(a, &AggregatorConfig{
		Name: "TestRunningAggregator",
		Filter: Filter{
			NamePass: []string{"*"},
		},
		Period: time.Millisecond * 500,
	})
	assert.NoError(t, ra.Config.Filter.Compile())
	acc := testutil.Accumulator{}
	shutdown := make(chan struct{})

	var wg sync.WaitGroup
	wg.Add(1)
	go func() {
		defer wg.Done()
		ra.Run(&acc, shutdown)
	}()

	m := ra.MakeMetric(
		"RITest",
		map[string]interface{}{"value": int(101)},
		map[string]string{},
		telegraf.Untyped,
		time.Now().Add(time.Millisecond*100),
	)
	assert.False(t, ra.Add(m))

	for {
		time.Sleep(time.Millisecond)
		if acc.NMetrics() > 0 {
			break
		}
	}
	acc.AssertContainsFields(t, "TestMetric", map[string]interface{}{"sum": int64(101)})

	close(shutdown)
	wg.Wait()
}