promtool: use go-cmp instead of DeepEqual

go-cmp allows more control over unexported fields and implementation
details.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

cmd/promtool/sd.go

@@ -18,10 +18,10 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
-	"reflect"
 	"time"
 
 	"github.com/go-kit/log"
+	"github.com/google/go-cmp/cmp"
 	"github.com/prometheus/client_golang/prometheus"
 
 	"github.com/prometheus/prometheus/config"
@@ -153,7 +153,7 @@ func getSDCheckResult(targetGroups []*targetgroup.Group, scrapeConfig *config.Sc
 
 			duplicateRes := false
 			for _, sdCheckRes := range sdCheckResults {
-				if reflect.DeepEqual(sdCheckRes, result) {
+				if cmp.Equal(sdCheckRes, result, cmp.Comparer(labels.Equal)) {
 					duplicateRes = true
 					break
 				}

cmd/promtool/unittest.go

@@ -20,13 +20,13 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
-	"reflect"
 	"sort"
 	"strconv"
 	"strings"
 	"time"
 
 	"github.com/go-kit/log"
+	"github.com/google/go-cmp/cmp"
 	"github.com/grafana/regexp"
 	"github.com/nsf/jsondiff"
 	"github.com/prometheus/common/model"
@@ -340,7 +340,7 @@ func (tg *testGroup) test(evalInterval time.Duration, groupOrderMap map[string]i
 				sort.Sort(gotAlerts)
 				sort.Sort(expAlerts)
 
-				if !reflect.DeepEqual(expAlerts, gotAlerts) {
+				if !cmp.Equal(expAlerts, gotAlerts, cmp.Comparer(labels.Equal)) {
 					var testName string
 					if tg.TestGroupName != "" {
 						testName = fmt.Sprintf("    name: %s,\n", tg.TestGroupName)
@@ -448,7 +448,7 @@ Outer:
 		sort.Slice(gotSamples, func(i, j int) bool {
 			return labels.Compare(gotSamples[i].Labels, gotSamples[j].Labels) <= 0
 		})
-		if !reflect.DeepEqual(expSamples, gotSamples) {
+		if !cmp.Equal(expSamples, gotSamples, cmp.Comparer(labels.Equal)) {
 			errs = append(errs, fmt.Errorf("    expr: %q, time: %s,\n        exp: %v\n        got: %v", testCase.Expr,
 				testCase.EvalTime.String(), parsedSamplesString(expSamples), parsedSamplesString(gotSamples)))
 		}