Update tag list conformance test to verify sort order

> If the list is not empty, the tags MUST be in lexical order (i.e. case-insensitive alphanumeric order).

Signed-off-by: Tianon Gravi <[email protected]>

Author: tianon

conformance/03_discovery_test.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net/http"
 	"os"
+	"sort"
 	"strconv"
 	"strings"
 
@@ -253,14 +254,18 @@ var test03ContentDiscovery = func() {
 		})
 
 		g.Context("Test content discovery endpoints (listing tags)", func() {
-			g.Specify("GET request to list tags should yield 200 response", func() {
+			g.Specify("GET request to list tags should yield 200 response and be in sorted order", func() {
 				SkipIfDisabled(contentDiscovery)
 				req := client.NewRequest(reggie.GET, "/v2/<name>/tags/list")
 				resp, err := client.Do(req)
 				Expect(err).To(BeNil())
 				Expect(resp.StatusCode()).To(Equal(http.StatusOK))
 				tagList = getTagList(resp)
 				numTags = len(tagList)
+				// If the list is not empty, the tags MUST be in lexical order (i.e. case-insensitive alphanumeric order).
+				sortedTagList := append([]string{}, tagList...)
+				sort.Slice(sortedTagList, func(i, j int) bool { return strings.ToLower(sortedTagList[i]) < strings.ToLower(sortedTagList[j]) })
+				Expect(tagList).To(Equal(sortedTagList))
 			})
 
 			g.Specify("GET number of tags should be limitable by `n` query parameter", func() {