mutation.test.js

import { mutationBuilder, _advancedQueryBuilder } from './index.js'

function createRemover (query) {
  const f = _advancedQueryBuilder(query, { parent: true })
  return function () {
    const result = f(...arguments)
    for (const [item, arr] of result) {
      const index = arr.indexOf(item)
      arr.splice(index, 1)
    }
    return arguments[0]
  }
}
const personCreator = () => ({
  age: 23,
  name: 'Jesse Mitchell',
  interests: ['programming', 'business'],
  friends: [{
    name: 'Bob',
    age: 25,
    interests: [{ type: 'fun' }]
  }, {
    name: 'Kevin',
    age: 23,
    interests: [{ type: 'fun' }, { type: 'see' }]
  }, {
    name: 'Steve',
    age: 32
  }, {
    name: 'Aaron',
    age: 17
  }]
})
describe('Mutation Tests', () => {
  test('Simple mutation (fixed)', () => {
    const person = personCreator()
    const f = mutationBuilder('$.age')
    expect(f(person, 24)).toStrictEqual({ ...person, age: 24 })
  })
  test('Simple mutation (variable)', () => {
    const person = personCreator()
    const f = mutationBuilder('$.age')
    expect(f(person, i => i + 1)).toStrictEqual({ ...person, age: 24 })
  })
  test('Complex nested mutation', () => {
    const person = personCreator()
    const f = mutationBuilder('$.friends.*.interests.*.type')
    f(person, 'changed')
    expect(person.friends.flatMap(i => i.interests).filter(i => i).map(i => i.type)).toStrictEqual(['changed', 'changed', 'changed'])
  })
  test('Complex mutation', () => {
    const person = personCreator()
    const f = mutationBuilder('$.interests.*')
    expect(f(person, i => i + 1).interests).toStrictEqual(['programming1', 'business1'])
  })
  test('Removal mutation (using a query w/o context)', () => {
    const person = personCreator()
    const f = createRemover('$.friends.*{ "<": [{ "var": "age" }, 30] }')
    expect(f(person).friends).toStrictEqual([{
      name: 'Steve',
      age: 32
    }])
  })
  test('Removal mutation (using a query w/ context)', () => {
    const person = personCreator()
    const f = createRemover('$.friends.*{ "<": [{ "var": "age" }, { "context": "" }] }')
    expect(f(person, 30).friends).toStrictEqual([{
      name: 'Steve',
      age: 32
    }])
  })
  test('Removal mutation (using a JSONPath query w/ context)', () => {
    const person = personCreator()
    const f = createRemover('$.friends.[?(@.age < $)]')
    expect(f(person, 30).friends).toStrictEqual([{
      name: 'Steve',
      age: 32
    }])
  })
})