Add Kibana input plugin (#4585)

plugins/inputs/kibana/kibana_test.go

@@ -0,0 +1,66 @@
+package kibana
+
+import (
+	"io/ioutil"
+	"net/http"
+	"strings"
+	"testing"
+
+	"github.com/influxdata/telegraf/testutil"
+)
+
+func defaultTags() map[string]string {
+	return map[string]string{
+		"name":    "my-kibana",
+		"source":  "example.com:5601",
+		"version": "6.3.2",
+		"status":  "green",
+	}
+}
+
+type transportMock struct {
+	statusCode int
+	body       string
+}
+
+func newTransportMock(statusCode int, body string) http.RoundTripper {
+	return &transportMock{
+		statusCode: statusCode,
+		body:       body,
+	}
+}
+
+func (t *transportMock) RoundTrip(r *http.Request) (*http.Response, error) {
+	res := &http.Response{
+		Header:     make(http.Header),
+		Request:    r,
+		StatusCode: t.statusCode,
+	}
+	res.Header.Set("Content-Type", "application/json")
+	res.Body = ioutil.NopCloser(strings.NewReader(t.body))
+	return res, nil
+}
+
+func checkKibanaStatusResult(t *testing.T, acc *testutil.Accumulator) {
+	tags := defaultTags()
+	acc.AssertContainsTaggedFields(t, "kibana", kibanaStatusExpected, tags)
+}
+
+func TestGather(t *testing.T) {
+	ks := newKibanahWithClient()
+	ks.Servers = []string{"http://example.com:5601"}
+	ks.client.Transport = newTransportMock(http.StatusOK, kibanaStatusResponse)
+
+	var acc testutil.Accumulator
+	if err := acc.GatherError(ks.Gather); err != nil {
+		t.Fatal(err)
+	}
+
+	checkKibanaStatusResult(t, &acc)
+}
+
+func newKibanahWithClient() *Kibana {
+	ks := NewKibana()
+	ks.client = &http.Client{}
+	return ks
+}