Merge pull request #20869 from overleaf/em-ranges-tracker-duplicate-ids

Fix handling of duplicate change ids in RangesTracker

GitOrigin-RevId: 1a75d1dc7e7931c459d2d004973f34d931100d33

libraries/ranges-tracker/test/unit/ranges-tracker-test.js

@@ -0,0 +1,29 @@
+const { expect } = require('chai')
+const RangesTracker = require('../..')
+
+describe('RangesTracker', function () {
+  describe('with duplicate change ids', function () {
+    beforeEach(function () {
+      this.changes = [
+        { id: 'id1', op: { p: 1, i: 'hello' } },
+        { id: 'id2', op: { p: 10, i: 'world' } },
+        { id: 'id3', op: { p: 20, i: '!!!' } },
+        { id: 'id1', op: { p: 30, d: 'duplicate' } },
+      ]
+      this.rangesTracker = new RangesTracker(this.changes, this.comments)
+    })
+
+    it('getChanges() returns all changes with the given ids', function () {
+      expect(this.rangesTracker.getChanges(['id1', 'id2'])).to.deep.equal([
+        this.changes[0],
+        this.changes[1],
+        this.changes[3],
+      ])
+    })
+
+    it('removeChangeIds() removes all changes with the given ids', function () {
+      this.rangesTracker.removeChangeIds(['id1', 'id2'])
+      expect(this.rangesTracker.changes).to.deep.equal([this.changes[2]])
+    })
+  })
+})