Provide function to test metric equality (#4464)

testutil/metric.go

@@ -0,0 +1,16 @@
+package testutil
+
+import (
+	"testing"
+
+	"github.com/influxdata/telegraf"
+	"github.com/stretchr/testify/require"
+)
+
+// MustEqual requires a and b to be identical.
+func MustEqual(t *testing.T, got telegraf.Metric, want Metric) {
+	require.Equal(t, want.Measurement, got.Name())
+	require.Equal(t, want.Fields, got.Fields())
+	require.Equal(t, want.Tags, got.Tags())
+	require.Equal(t, want.Time, got.Time())
+}

testutil/metric_test.go

@@ -0,0 +1,57 @@
+package testutil
+
+import (
+	"testing"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/metric"
+)
+
+func TestMustEqual(t *testing.T) {
+	type args struct {
+	}
+	tests := []struct {
+		name string
+		got  telegraf.Metric
+		want Metric
+	}{
+		{
+			name: "telegraf and testutil metrics should be equal",
+			got: func() telegraf.Metric {
+				m, _ := metric.New(
+					"test",
+					map[string]string{
+						"t1": "v1",
+						"t2": "v2",
+					},
+					map[string]interface{}{
+						"f1": 1,
+						"f2": 3.14,
+						"f3": "v3",
+					},
+					time.Unix(0, 0),
+				)
+				return m
+			}(),
+			want: Metric{
+				Measurement: "test",
+				Tags: map[string]string{
+					"t1": "v1",
+					"t2": "v2",
+				},
+				Fields: map[string]interface{}{
+					"f1": int64(1),
+					"f2": 3.14,
+					"f3": "v3",
+				},
+				Time: time.Unix(0, 0),
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			MustEqual(t, tt.got, tt.want)
+		})
+	}
+}