highlighting merged document results

test/highlight.js

@@ -840,6 +840,66 @@ if(!build_light) describe("Result Highlighting", function(){
         expect(result[1].highlight.length).to.below(80 + (7 * 7));
     });
 
+    it("Should have been highlighted merged results properly", function(){
+
+        // some test data
+        const data = [{
+            "id": 1,
+            "title": "Carmencita",
+            "description": "Description: Carmencita"
+        },{
+            "id": 2,
+            "title": "Le clown et ses chiens",
+            "description": "Description: Le clown et ses chiens"
+        }];
+
+        // create the document index
+        const index = new Document({
+            encoder: Charset.LatinBalance,
+            document: {
+                store: true,
+                index: [{
+                    field: "title",
+                    tokenize: "forward"
+                },{
+                    field: "description",
+                    tokenize: "forward"
+                }]
+            }
+        });
+
+        // add test data
+        for(let i = 0; i < data.length; i++){
+            index.add(data[i]);
+        }
+
+        let result = index.search({
+            query: "karmen or clown or not found",
+            suggest: true,
+            enrich: true,
+            merge: true,
+            highlight: "<b>$1</b>"
+        });
+
+        expect(result).to.eql([{
+            id: 1,
+            doc: data[0],
+            field: ["title", "description"],
+            highlight: {
+                "title": '<b>Carmen</b>cita',
+                "description": 'Description: <b>Carmen</b>cita',
+            }
+        },{
+            id: 2,
+            doc: data[1],
+            field: ["title", "description"],
+            highlight: {
+                "title": 'Le <b>clown</b> et ses chiens',
+                "description": 'Description: Le <b>clown</b> et ses chiens',
+            }
+        }]);
+    });
+
     it("Should have been highlighted results properly (#480)", function(){
 
         const index = new Document({