Adapt crawl test

also, only insert alternateIds when not empty

Author: dontcallmedom

src/browserlib/map-ids-to-headings.mjs

@@ -86,7 +86,7 @@ export default function () {
     let href = nodeid;
 
     if (parentSection) {
-      const alternateIds = [];
+      let alternateIds = [];
       let id;
 
       const heading = parentSection.heading;
@@ -117,9 +117,12 @@ export default function () {
       if (id) {
         mapping.id = id;
       }
+      alternateIds = alternateIds.filter(id => id !== mapping.id);
       mapping.href = href;
       mapping.title = trimmedText.replace(reNumber, '');
-      mapping.alternateIds = alternateIds.filter(id => id !== mapping.id);
+      if (alternateIds.length) {
+	mapping.alternateIds = alternateIds;
+      }
       mappingTable[nodeid] = mapping;
 
       if (number) {

test/crawl-test.json

@@ -161,21 +161,24 @@
         "id": "toc",
         "href": "https://w3c.github.io/mediacapture-output/#toc",
         "level": 2,
-        "title": "Table of Contents"
+        "title": "Table of Contents",
+	"alternateIds": ["table-of-contents"]
       },
       {
         "id": "references",
         "href": "https://w3c.github.io/mediacapture-output/#references",
         "level": 2,
         "title": "References",
-        "number": "A"
+        "number": "A",
+	"alternateIds": ["a-references"]
       },
       {
         "id": "informative-references",
         "href": "https://w3c.github.io/mediacapture-output/#informative-references",
         "level": 3,
         "title": "Informative references",
-        "number": "A.1"
+        "number": "A.1",
+	"alternateIds": ["a-1-informative-references"]
       }
     ],
     "ids": [