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269 lines
7.2 KiB
JavaScript
269 lines
7.2 KiB
JavaScript
//
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// These tests are based on the OT.js tests:
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// https://github.com/Operational-Transformation/ot.js/blob/
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// 8873b7e28e83f9adbf6c3a28ec639c9151a838ae/test/lib/test-text-operation.js
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//
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'use strict'
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const { expect } = require('chai')
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const random = require('./support/random')
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const ot = require('..')
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const TextOperation = ot.TextOperation
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function randomOperation(str) {
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const operation = new TextOperation()
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let left
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while (true) {
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left = str.length - operation.baseLength
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if (left === 0) break
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const r = Math.random()
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const l = 1 + random.int(Math.min(left - 1, 20))
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if (r < 0.2) {
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operation.insert(random.string(l))
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} else if (r < 0.4) {
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operation.remove(l)
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} else {
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operation.retain(l)
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}
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}
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if (Math.random() < 0.3) {
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operation.insert(1 + random.string(10))
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}
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return operation
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}
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describe('TextOperation', function () {
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const numTrials = 500
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it('tracks base and target lengths', function () {
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const o = new TextOperation()
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expect(o.baseLength).to.equal(0)
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expect(o.targetLength).to.equal(0)
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o.retain(5)
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expect(o.baseLength).to.equal(5)
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expect(o.targetLength).to.equal(5)
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o.insert('abc')
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expect(o.baseLength).to.equal(5)
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expect(o.targetLength).to.equal(8)
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o.retain(2)
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expect(o.baseLength).to.equal(7)
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expect(o.targetLength).to.equal(10)
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o.remove(2)
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expect(o.baseLength).to.equal(9)
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expect(o.targetLength).to.equal(10)
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})
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it('supports chaining', function () {
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const o = new TextOperation()
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.retain(5)
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.retain(0)
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.insert('lorem')
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.insert('')
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.remove('abc')
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.remove(3)
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.remove(0)
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.remove('')
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expect(o.ops.length).to.equal(3)
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})
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it('ignores empty operations', function () {
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const o = new TextOperation()
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o.retain(0)
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o.insert('')
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o.remove('')
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expect(o.ops.length).to.equal(0)
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})
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it('checks for equality', function () {
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const op1 = new TextOperation().remove(1).insert('lo').retain(2).retain(3)
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const op2 = new TextOperation().remove(-1).insert('l').insert('o').retain(5)
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expect(op1.equals(op2)).to.be.true
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op1.remove(1)
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op2.retain(1)
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expect(op1.equals(op2)).to.be.false
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})
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it('merges ops', function () {
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function last(arr) {
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return arr[arr.length - 1]
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}
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const o = new TextOperation()
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expect(o.ops.length).to.equal(0)
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o.retain(2)
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expect(o.ops.length).to.equal(1)
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expect(last(o.ops)).to.equal(2)
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o.retain(3)
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expect(o.ops.length).to.equal(1)
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expect(last(o.ops)).to.equal(5)
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o.insert('abc')
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expect(o.ops.length).to.equal(2)
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expect(last(o.ops)).to.equal('abc')
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o.insert('xyz')
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expect(o.ops.length).to.equal(2)
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expect(last(o.ops)).to.equal('abcxyz')
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o.remove('d')
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expect(o.ops.length).to.equal(3)
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expect(last(o.ops)).to.equal(-1)
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o.remove('d')
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expect(o.ops.length).to.equal(3)
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expect(last(o.ops)).to.equal(-2)
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})
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it('checks for no-ops', function () {
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const o = new TextOperation()
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expect(o.isNoop()).to.be.true
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o.retain(5)
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expect(o.isNoop()).to.be.true
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o.retain(3)
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expect(o.isNoop()).to.be.true
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o.insert('lorem')
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expect(o.isNoop()).to.be.false
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})
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it('converts to string', function () {
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const o = new TextOperation()
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o.retain(2)
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o.insert('lorem')
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o.remove('ipsum')
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o.retain(5)
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expect(o.toString()).to.equal(
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"retain 2, insert 'lorem', remove 5, retain 5"
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)
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})
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it('converts from JSON', function () {
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const ops = [2, -1, -1, 'cde']
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const o = TextOperation.fromJSON(ops)
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expect(o.ops.length).to.equal(3)
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expect(o.baseLength).to.equal(4)
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expect(o.targetLength).to.equal(5)
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function assertIncorrectAfter(fn) {
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const ops2 = ops.slice(0)
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fn(ops2)
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expect(() => {
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TextOperation.fromJSON(ops2)
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}).to.throw
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}
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assertIncorrectAfter(ops2 => {
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ops2.push({ insert: 'x' })
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})
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assertIncorrectAfter(ops2 => {
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ops2.push(null)
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})
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})
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it(
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'applies (randomised)',
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random.test(numTrials, () => {
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const str = random.string(50)
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const o = randomOperation(str)
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expect(str.length).to.equal(o.baseLength)
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expect(o.apply(str).length).to.equal(o.targetLength)
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})
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)
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it(
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'inverts (randomised)',
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random.test(numTrials, () => {
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const str = random.string(50)
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const o = randomOperation(str)
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const p = o.invert(str)
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expect(o.baseLength).to.equal(p.targetLength)
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expect(o.targetLength).to.equal(p.baseLength)
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expect(p.apply(o.apply(str))).to.equal(str)
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})
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)
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it(
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'converts to/from JSON (randomised)',
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random.test(numTrials, () => {
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const doc = random.string(50)
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const operation = randomOperation(doc)
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const roundTripOperation = TextOperation.fromJSON(operation.toJSON())
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expect(operation.equals(roundTripOperation)).to.be.true
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})
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)
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it(
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'composes (randomised)',
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random.test(numTrials, () => {
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// invariant: apply(str, compose(a, b)) === apply(apply(str, a), b)
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const str = random.string(20)
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const a = randomOperation(str)
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const afterA = a.apply(str)
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expect(afterA.length).to.equal(a.targetLength)
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const b = randomOperation(afterA)
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const afterB = b.apply(afterA)
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expect(afterB.length).to.equal(b.targetLength)
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const ab = a.compose(b)
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expect(ab.targetLength).to.equal(b.targetLength)
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const afterAB = ab.apply(str)
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expect(afterAB).to.equal(afterB)
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})
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)
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it(
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'transforms (randomised)',
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random.test(numTrials, () => {
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// invariant: compose(a, b') = compose(b, a')
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// where (a', b') = transform(a, b)
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const str = random.string(20)
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const a = randomOperation(str)
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const b = randomOperation(str)
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const primes = TextOperation.transform(a, b)
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const aPrime = primes[0]
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const bPrime = primes[1]
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const abPrime = a.compose(bPrime)
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const baPrime = b.compose(aPrime)
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const afterAbPrime = abPrime.apply(str)
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const afterBaPrime = baPrime.apply(str)
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expect(abPrime.equals(baPrime)).to.be.true
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expect(afterAbPrime).to.equal(afterBaPrime)
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})
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)
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it('throws when invalid operations are applied', function () {
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const operation = new TextOperation().retain(1)
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expect(() => {
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operation.apply('')
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}).to.throw(TextOperation.ApplyError)
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expect(() => {
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operation.apply(' ')
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}).not.to.throw
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})
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it('throws when insert text contains non BMP chars', function () {
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const operation = new TextOperation()
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const str = '𝌆\n'
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expect(() => {
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operation.insert(str)
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}).to.throw(
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TextOperation.UnprocessableError,
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/inserted text contains non BMP characters/
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)
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})
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it('throws when base string contains non BMP chars', function () {
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const operation = new TextOperation()
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const str = '𝌆\n'
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expect(() => {
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operation.apply(str)
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}).to.throw(
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TextOperation.UnprocessableError,
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/string contains non BMP characters/
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)
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})
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it('throws at from JSON when it contains non BMP chars', function () {
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const operation = ['𝌆\n']
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expect(() => {
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TextOperation.fromJSON(operation)
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}).to.throw(
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TextOperation.UnprocessableError,
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/inserted text contains non BMP characters/
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)
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})
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})
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