test(processors.s2geo): Add unit-test for tracking metrics (#14809)

plugins/processors/s2geo/s2geo_test.go

@@ -1,10 +1,12 @@
 package s2geo
 
 import (
+	"sync"
 	"testing"
 	"time"
 
 	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/metric"
 	"github.com/influxdata/telegraf/testutil"
 	"github.com/stretchr/testify/require"
 )
@@ -24,7 +26,7 @@ func TestGeo(t *testing.T) {
 	err := plugin.Init()
 	require.NoError(t, err)
 
-	metric := testutil.MustMetric(
+	m := testutil.MustMetric(
 		"mta",
 		map[string]string{},
 		map[string]interface{}{
@@ -48,8 +50,74 @@ func TestGeo(t *testing.T) {
 		),
 	}
 
-	actual := plugin.Apply(metric)
+	actual := plugin.Apply(m)
 	testutil.RequireMetricsEqual(t, expected, actual)
-	actual = pluginMostlyDefault.Apply(metric)
+	actual = pluginMostlyDefault.Apply(m)
 	testutil.RequireMetricsEqual(t, expected, actual)
 }
+
+func TestTracking(t *testing.T) {
+	inputRaw := []telegraf.Metric{
+		metric.New("foo", map[string]string{}, map[string]interface{}{"lat": 40.878738, "lon": 72.517572}, time.Unix(0, 0)),
+		metric.New("bar", map[string]string{}, map[string]interface{}{"lat": 42.842451, "lon": 74.211361}, time.Unix(0, 0)),
+		metric.New("baz", map[string]string{}, map[string]interface{}{"lat": 32.300963, "lon": 14.123442}, time.Unix(0, 0)),
+	}
+
+	var mu sync.Mutex
+	delivered := make([]telegraf.DeliveryInfo, 0, len(inputRaw))
+	notify := func(di telegraf.DeliveryInfo) {
+		mu.Lock()
+		defer mu.Unlock()
+		delivered = append(delivered, di)
+	}
+
+	input := make([]telegraf.Metric, 0, len(inputRaw))
+	for _, m := range inputRaw {
+		tm, _ := metric.WithTracking(m, notify)
+		input = append(input, tm)
+	}
+
+	expected := []telegraf.Metric{
+		metric.New(
+			"foo",
+			map[string]string{"s2_cell_id": "3"},
+			map[string]interface{}{"lat": 40.878738, "lon": 72.517572},
+			time.Unix(0, 0),
+		),
+		metric.New(
+			"bar",
+			map[string]string{"s2_cell_id": "3"},
+			map[string]interface{}{"lat": 42.842451, "lon": 74.211361},
+			time.Unix(0, 0),
+		),
+		metric.New(
+			"baz",
+			map[string]string{"s2_cell_id": "1"},
+			map[string]interface{}{"lat": 32.300963, "lon": 14.123442},
+			time.Unix(0, 0),
+		),
+	}
+
+	plugin := &Geo{
+		LatField: "lat",
+		LonField: "lon",
+		TagKey:   "s2_cell_id",
+	}
+	require.NoError(t, plugin.Init())
+
+	// Process expected metrics and compare with resulting metrics
+	actual := plugin.Apply(input...)
+	testutil.RequireMetricsEqual(t, expected, actual)
+
+	// Simulate output acknowledging delivery
+	for _, m := range actual {
+		m.Accept()
+	}
+
+	// Check delivery
+	require.Eventuallyf(t, func() bool {
+		mu.Lock()
+		defer mu.Unlock()
+		return len(expected) == len(delivered)
+	}, time.Second, 100*time.Millisecond, "%d delivered but %d expected", len(delivered), len(expected))
+}