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services/document-updater/test/unit/js/DiffCodec/DiffCodecTests.js

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+const sinon = require('sinon')
+const { expect } = require('chai')
+const modulePath = '../../../../app/js/DiffCodec.js'
+const SandboxedModule = require('sandboxed-module')
+
+describe('DiffCodec', function () {
+  beforeEach(function () {
+    this.callback = sinon.stub()
+    this.DiffCodec = SandboxedModule.require(modulePath)
+  })
+
+  describe('diffAsShareJsOps', function () {
+    it('should insert new text correctly', function () {
+      this.before = ['hello world']
+      this.after = ['hello beautiful world']
+      const ops = this.DiffCodec.diffAsShareJsOp(this.before, this.after)
+      expect(ops).to.deep.equal([
+        {
+          i: 'beautiful ',
+          p: 6,
+        },
+      ])
+    })
+
+    it('should shift later inserts by previous inserts', function () {
+      this.before = ['the boy played with the ball']
+      this.after = ['the tall boy played with the red ball']
+      const ops = this.DiffCodec.diffAsShareJsOp(this.before, this.after)
+      expect(ops).to.deep.equal([
+        { i: 'tall ', p: 4 },
+        { i: 'red ', p: 29 },
+      ])
+    })
+
+    it('should delete text correctly', function () {
+      this.before = ['hello beautiful world']
+      this.after = ['hello world']
+      const ops = this.DiffCodec.diffAsShareJsOp(this.before, this.after)
+      expect(ops).to.deep.equal([
+        {
+          d: 'beautiful ',
+          p: 6,
+        },
+      ])
+    })
+
+    it('should shift later deletes by the first deletes', function () {
+      this.before = ['the tall boy played with the red ball']
+      this.after = ['the boy played with the ball']
+      const ops = this.DiffCodec.diffAsShareJsOp(this.before, this.after)
+      expect(ops).to.deep.equal([
+        { d: 'tall ', p: 4 },
+        { d: 'red ', p: 24 },
+      ])
+    })
+  })
+})