Add health output plugin (#5882)

plugins/outputs/health/contains_test.go

@@ -0,0 +1,68 @@
+package health_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/outputs/health"
+	"github.com/influxdata/telegraf/testutil"
+	"github.com/stretchr/testify/require"
+)
+
+func TestFieldFound(t *testing.T) {
+	metrics := []telegraf.Metric{
+		testutil.MustMetric(
+			"cpu",
+			map[string]string{},
+			map[string]interface{}{
+				"time_idle": 42.0,
+			},
+			time.Now()),
+	}
+
+	contains := &health.Contains{
+		Field: "time_idle",
+	}
+	result := contains.Check(metrics)
+	require.True(t, result)
+}
+
+func TestFieldNotFound(t *testing.T) {
+	metrics := []telegraf.Metric{
+		testutil.MustMetric(
+			"cpu",
+			map[string]string{},
+			map[string]interface{}{},
+			time.Now()),
+	}
+
+	contains := &health.Contains{
+		Field: "time_idle",
+	}
+	result := contains.Check(metrics)
+	require.False(t, result)
+}
+
+func TestOneMetricWithFieldIsSuccess(t *testing.T) {
+	metrics := []telegraf.Metric{
+		testutil.MustMetric(
+			"cpu",
+			map[string]string{},
+			map[string]interface{}{},
+			time.Now()),
+		testutil.MustMetric(
+			"cpu",
+			map[string]string{},
+			map[string]interface{}{
+				"time_idle": 42.0,
+			},
+			time.Now()),
+	}
+
+	contains := &health.Contains{
+		Field: "time_idle",
+	}
+	result := contains.Check(metrics)
+	require.True(t, result)
+}