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index.spec.js
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291 lines (241 loc) · 6.26 KB
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const Mapper = require('..')
const mapper = new Mapper()
it('should return first value if key is undefined', () => {
expect(Mapper.get()(true)).toBe(true)
expect(Mapper.assign()(true)).toBe(true)
})
it('should deeply get object fields', () => {
const deepObjectNesting = {
really: {
really: {
really: {
deep: 'deep'
}
}
}
}
expect(Mapper.get('really.really.really.deep')(deepObjectNesting)).toEqual(
'deep'
)
})
it('should deeply assign object fields', () => {
const shallowObj = {
shallow: false
}
const deepify = Mapper.assign('really.really.deep')
expect(deepify(shallowObj, true).really.really.deep).toEqual(true)
})
it('should be isomorphic', () => {
const complexKey = 'a.b.c.d.e.f'
const expected = 'ABCDEF'
const get = Mapper.get(complexKey)
const set = Mapper.assign(complexKey)
const isomorph = Mapper.compose(
get,
set
)
expect(isomorph({}, expected)).toEqual(expected)
})
it('should not fail if key is invalid', () => {
const obj = {
user: {
friends: [
{
name: 'Nick'
}
]
}
}
expect(Mapper.get('user.friends.1.name')(obj)).toBeUndefined()
})
it('should create an empty array for number keys', () => {
const obj = {}
const mapped = Mapper.assign('user.friends.0.name')(obj, 'Nick')
expect(mapped.user.friends).toBeInstanceOf(Array)
expect(mapped.user.friends[0].name).toBe('Nick')
})
it('should not override fields that already exist', () => {
const obj = {
user: {
id: 123
}
}
const mapped = Mapper.assign('user.name')(obj, 'Nick')
expect(mapped.user.id).toBe(123)
expect(mapped.user.name).toBe('Nick')
})
it.each([[undefined, {}], [null, { key: null }]])(
'map(() => %s) => %s',
(value, exp) => {
expect(mapper.map([{ field: 'key', type: () => value }], {})).toEqual(exp)
}
)
it('should work with basic string mappings', () => {
const curr = {
map: true,
morph: false
}
const mappings = ['map', 'morph']
const mapped = mapper.map(mappings, curr)
expect(mapped.map).toEqual(true)
expect(mapped.morph).toEqual(false)
})
it('should filter unmapped values', () => {
const curr = {
name: 'Mike',
email: 'hi@dawnlabs.io',
password: 'throw'
}
const mappings = ['name', 'email']
const mapped = mapper.map(mappings, curr)
expect(mapped).toEqual({ name: 'Mike', email: 'hi@dawnlabs.io' })
})
it('should handle deep transformations', () => {
const curr = {
here: {
there: {
anywhere: true
}
},
now: false
}
const mappings = ['here.there.anywhere:here', 'now:maybe.later.never']
expect(mapper.map(mappings, curr).here).toEqual(true)
expect(mapper.map(mappings, curr).maybe.later.never).toEqual(false)
})
it('should not set key if undefined is returned', () => {
const obj = { key: true }
const mappings = [{ field: 'key', type: () => undefined }]
expect(mapper.map(mappings, obj)).toEqual({})
})
it('should allow you to compose a type function', () => {
const curr = { beverage: Infinity }
const ENUM = [
'☕',
'🍸',
'🍹',
'🍵',
'🥛',
'🍺',
'🥃',
'🍼',
'🍷',
'🍶',
'🍾'
]
// Use, `Mapper.compose`, or your favorite functional library
const bestBeverage = Mapper.compose(
index => ENUM[index],
key => Math.min(key, 0)
)
const mappings = [
{
field: 'beverage:bestBeverage',
type: bestBeverage
}
]
expect(mapper.map(mappings, curr).bestBeverage).toEqual('☕')
})
it('should allow function composition for creating types', () => {
const curr = { binary: '0001 0001' }
const ENUM = {
0: '$',
1: '£',
2: '₩',
17: '¥'
}
// Contrived type
const currencyEnumFromBinary = [
v => ENUM[v] || '$',
v => parseInt(v, 2),
v => v.replace(/\s+/g, '')
]
const mappings = [
{
field: 'binary:decimal',
type: currencyEnumFromBinary
}
]
expect(mapper.map(mappings, curr).decimal).toEqual('¥')
})
it('should allow you to pass pre-mapping filters', () => {
const curr = { possiblyNull: null }
const USE_DEFAULT = (value, field) =>
value === null || value === undefined ? field.default : value
const mappings = [
{
field: 'possiblyNull:definitelyNotNull',
default: 'NOT TODAY!'
}
]
const preFilterMapper = new Mapper({
preFilters: [USE_DEFAULT]
})
const mapped = preFilterMapper.map(mappings, curr)
expect(mapped.definitelyNotNull).toEqual('NOT TODAY!')
})
it('should allow you to pass post-mapping filters', () => {
const curr = { possiblyNull: null }
const USE_GLOBAL_DEFAULTS = (value, field, options) => {
if (value === null || value === undefined) {
return options.GLOBAL_DEFAULTS && options.GLOBAL_DEFAULTS[field.type]
}
return value
}
const GLOBAL_DEFAULTS = {
nonNullable: 'THIS IS JUST A GLOBAL DEFAULT'
}
const mappings = [
{
field: 'possiblyNull:definitelyNotNull',
type: 'nonNullable'
}
]
const postFilterMapper = new Mapper({
postFilters: [USE_GLOBAL_DEFAULTS],
/**
* This field is not specific to this library, but allows you to build your
* own mapping system
*/
GLOBAL_DEFAULTS
})
expect(postFilterMapper.map(mappings, curr).definitelyNotNull).toEqual(
'THIS IS JUST A GLOBAL DEFAULT'
)
})
it('should allow you to specify a type system', () => {
const types = {
bool: Boolean,
upper: s => s.toUpperCase()
}
const mapper = new Mapper({ types })
const obj = { key: 'true' }
expect(mapper.map([{ field: 'key', type: 'bool' }], obj).key).toBe(true)
expect(mapper.map([{ field: 'key', type: 'upper' }], obj).key).toBe('TRUE')
})
it('should be able to reduce multiple values into one', () => {
const obj = {
user: {
firstName: 'Mike',
lastName: 'Fix',
professionInfo: {
title: 'Mr',
occupation: 'Software Engineer'
}
}
}
const field = {
field: [
'user.firstName',
'user.lastName',
'user.professionInfo.title',
'user.professionInfo.occupation',
'description'
],
type: ([name1, name2, title, occ]) =>
`${title}. ${name1} ${name2} is a ${occ}`
}
expect(mapper.map([field], obj).description).toBe(
'Mr. Mike Fix is a Software Engineer'
)
})