reorganize packages and add tests for zabbix datasource instance methods

pkg/zabbixapi/testing.go

@@ -0,0 +1,44 @@
+package zabbixapi
+
+import (
+	"bytes"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+
+	"github.com/grafana/grafana-plugin-sdk-go/backend/log"
+)
+
+type RoundTripFunc func(req *http.Request) *http.Response
+
+func (f RoundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) {
+	return f(req), nil
+}
+
+//NewTestClient returns *http.Client with Transport replaced to avoid making real calls
+func NewTestClient(fn RoundTripFunc) *http.Client {
+	return &http.Client{
+		Transport: RoundTripFunc(fn),
+	}
+}
+
+func MockZabbixAPI(body string, statusCode int) (*ZabbixAPI, error) {
+	apiLogger := log.New()
+	zabbixURL, err := url.Parse("http://zabbix.org/zabbix")
+	if err != nil {
+		return nil, err
+	}
+
+	return &ZabbixAPI{
+		url:    zabbixURL,
+		logger: apiLogger,
+
+		httpClient: NewTestClient(func(req *http.Request) *http.Response {
+			return &http.Response{
+				StatusCode: statusCode,
+				Body:       ioutil.NopCloser(bytes.NewBufferString(body)),
+				Header:     make(http.Header),
+			}
+		}),
+	}, nil
+}