added mutation spec

app/assets/javascripts/notes/stores/mutations.js

@@ -93,16 +93,18 @@ export default {
       // To support legacy notes, should be very rare case.
       if (note.individual_note && note.notes.length > 1) {
         note.notes.forEach((n) => {
-          const nn = Object.assign({}, note);
-          nn.notes = [n]; // override notes array to only have one item to mimick individual_note
-          notes.push(nn);
+          notes.push({
+            ...note,
+            notes: [n], // override notes array to only have one item to mimick individual_note
+          });
         });
       } else {
-        const nn = Object.assign({}, note);
         const oldNote = utils.findNoteObjectById(state.notes, note.id);
-        nn.expanded = oldNote ? oldNote.expanded : note.expanded;
 
-        notes.push(nn);
+        notes.push({
+          ...note,
+          expanded: (oldNote ? oldNote.expanded : note.expanded),
+        });
       }
     });
 

spec/javascripts/notes/stores/mutation_spec.js

@@ -101,10 +101,21 @@ describe('Notes Store mutations', () => {
       const state = {
         notes: [],
       };
+      const legacyNote = {
+        id: 2,
+        individual_note: true,
+        notes: [{
+          note: '1',
+        }, {
+          note: '2',
+        }],
+      };
 
-      mutations.SET_INITIAL_NOTES(state, [note]);
+      mutations.SET_INITIAL_NOTES(state, [note, legacyNote]);
       expect(state.notes[0].id).toEqual(note.id);
-      expect(state.notes.length).toEqual(1);
+      expect(state.notes[1].notes[0].note).toBe(legacyNote.notes[0].note);
+      expect(state.notes[2].notes[0].note).toBe(legacyNote.notes[1].note);
+      expect(state.notes.length).toEqual(3);
     });
   });