fix: flaky test for api/v1/targets/metadata. (#6436)

* Allows sorting of responses from the API in tests

Fixes flaky test for api/v1/targets/metadata.

Allows sorting of responses from the API. For our tests to be deterministic, we need to ensure the response from the API follows an order. This structure allows us to define one.

Fixes #6431
Signed-off-by: Ngotjosh <josue@grafana.com>

web/api/v1/api_test.go

@@ -27,6 +27,7 @@ import (
 	"net/url"
 	"os"
 	"reflect"
+	"sort"
 	"strings"
 	"testing"
 	"time"
@@ -539,6 +540,7 @@ func testEndpoints(t *testing.T, api *API, testLabelAPI bool) {
 		query    url.Values
 		response interface{}
 		errType  errorType
+		sorter   func(interface{})
 	}
 
 	var tests = []test{
@@ -1009,6 +1011,12 @@ func testEndpoints(t *testing.T, api *API, testLabelAPI bool) {
 					Unit:   "",
 				},
 			},
+			sorter: func(m interface{}) {
+				sort.Slice(m.([]metricMetadata), func(i, j int) bool {
+					s := m.([]metricMetadata)
+					return s[i].Metric < s[j].Metric
+				})
+			},
 		},
 		// Without a matching metric.
 		{
@@ -1162,6 +1170,11 @@ func testEndpoints(t *testing.T, api *API, testLabelAPI bool) {
 			}
 			res := test.endpoint(req.WithContext(ctx))
 			assertAPIError(t, res.err, test.errType)
+
+			if test.sorter != nil {
+				test.sorter(res.data)
+			}
+
 			assertAPIResponse(t, res.data, test.response)
 		}
 	}
@@ -1185,6 +1198,8 @@ func assertAPIError(t *testing.T, got *apiError, exp errorType) {
 }
 
 func assertAPIResponse(t *testing.T, got interface{}, exp interface{}) {
+	t.Helper()
+
 	if !reflect.DeepEqual(exp, got) {
 		respJSON, err := json.Marshal(got)
 		if err != nil {