Add Date Processor Plugin (#5895)

plugins/processors/date/date_test.go

@@ -0,0 +1,67 @@
+package date
+
+import (
+	"testing"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/metric"
+	"github.com/stretchr/testify/assert"
+)
+
+func MustMetric(name string, tags map[string]string, fields map[string]interface{}, metricTime time.Time) telegraf.Metric {
+	if tags == nil {
+		tags = map[string]string{}
+	}
+	if fields == nil {
+		fields = map[string]interface{}{}
+	}
+	m, _ := metric.New(name, tags, fields, metricTime)
+	return m
+}
+
+func TestMonthTag(t *testing.T) {
+	dateFormatMonth := Date{
+		TagKey:     "month",
+		DateFormat: "Jan",
+	}
+
+	currentTime := time.Now()
+	month := currentTime.Format("Jan")
+
+	m1 := MustMetric("foo", nil, nil, currentTime)
+	m2 := MustMetric("bar", nil, nil, currentTime)
+	m3 := MustMetric("baz", nil, nil, currentTime)
+	monthApply := dateFormatMonth.Apply(m1, m2, m3)
+	assert.Equal(t, map[string]string{"month": month}, monthApply[0].Tags(), "should add tag 'month'")
+	assert.Equal(t, map[string]string{"month": month}, monthApply[1].Tags(), "should add tag 'month'")
+	assert.Equal(t, map[string]string{"month": month}, monthApply[2].Tags(), "should add tag 'month'")
+}
+
+func TestYearTag(t *testing.T) {
+	dateFormatYear := Date{
+		TagKey:     "year",
+		DateFormat: "2006",
+	}
+	currentTime := time.Now()
+	year := currentTime.Format("2006")
+
+	m4 := MustMetric("foo", nil, nil, currentTime)
+	m5 := MustMetric("bar", nil, nil, currentTime)
+	m6 := MustMetric("baz", nil, nil, currentTime)
+	yearApply := dateFormatYear.Apply(m4, m5, m6)
+	assert.Equal(t, map[string]string{"year": year}, yearApply[0].Tags(), "should add tag 'year'")
+	assert.Equal(t, map[string]string{"year": year}, yearApply[1].Tags(), "should add tag 'year'")
+	assert.Equal(t, map[string]string{"year": year}, yearApply[2].Tags(), "should add tag 'year'")
+}
+
+func TestOldDateTag(t *testing.T) {
+	dateFormatYear := Date{
+		TagKey:     "year",
+		DateFormat: "2006",
+	}
+
+	m7 := MustMetric("foo", nil, nil, time.Date(1993, 05, 27, 0, 0, 0, 0, time.UTC))
+	customDateApply := dateFormatYear.Apply(m7)
+	assert.Equal(t, map[string]string{"year": "1993"}, customDateApply[0].Tags(), "should add tag 'year'")
+}