172 lines
3.9 KiB
TypeScript
172 lines
3.9 KiB
TypeScript
import { computed, ref } from '@vue/reactivity'
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import { toDisplayString } from '../src'
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describe('toDisplayString', () => {
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test('nullish values', () => {
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expect(toDisplayString(null)).toBe('')
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expect(toDisplayString(undefined)).toBe('')
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})
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test('primitive values', () => {
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expect(toDisplayString(1)).toBe('1')
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expect(toDisplayString(true)).toBe('true')
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expect(toDisplayString(false)).toBe('false')
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expect(toDisplayString('hello')).toBe('hello')
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})
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test('Object and Arrays', () => {
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const obj = { foo: 123 }
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expect(toDisplayString(obj)).toBe(JSON.stringify(obj, null, 2))
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const arr = [obj]
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expect(toDisplayString(arr)).toBe(JSON.stringify(arr, null, 2))
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const objWithToStringOverride = {
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foo: 555,
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toString() {
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return 'override'
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}
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}
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expect(toDisplayString(objWithToStringOverride)).toBe('override')
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const objWithNonInvokableToString = {
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foo: 555,
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toString: null
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}
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expect(toDisplayString(objWithNonInvokableToString)).toBe(
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`{
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"foo": 555,
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"toString": null
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}`
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)
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// object created from null does not have .toString in its prototype
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const nullObjectWithoutToString = Object.create(null)
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nullObjectWithoutToString.bar = 1
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expect(toDisplayString(nullObjectWithoutToString)).toBe(
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`{
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"bar": 1
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}`
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)
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// array toString override is ignored
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const arrWithToStringOverride = [1, 2, 3]
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arrWithToStringOverride.toString = () =>
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'override for array is not supported'
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expect(toDisplayString(arrWithToStringOverride)).toBe(
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`[
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1,
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2,
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3
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]`
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)
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})
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test('refs', () => {
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const n = ref(1)
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const np = computed(() => n.value + 1)
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expect(
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toDisplayString({
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n,
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np
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})
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).toBe(JSON.stringify({ n: 1, np: 2 }, null, 2))
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})
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test('objects with custom toString', () => {
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class TestClass {
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toString() {
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return 'foo'
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}
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}
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const instance = new TestClass()
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expect(toDisplayString(instance)).toBe('foo')
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const obj = { toString: () => 'bar' }
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expect(toDisplayString(obj)).toBe('bar')
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})
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test('native objects', () => {
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const div = document.createElement('div')
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expect(toDisplayString(div)).toBe('[object HTMLDivElement]')
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expect(toDisplayString({ div })).toMatchInlineSnapshot(`
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"{
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\\"div\\": \\"[object HTMLDivElement]\\"
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}"
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`)
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})
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test('Map and Set', () => {
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const m = new Map<any, any>([
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[1, 'foo'],
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[{ baz: 1 }, { foo: 'bar', qux: 2 }]
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])
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const s = new Set<any>([1, { foo: 'bar' }, m])
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expect(toDisplayString(m)).toMatchInlineSnapshot(`
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"{
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\\"Map(2)\\": {
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\\"1 =>\\": \\"foo\\",
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\\"[object Object] =>\\": {
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\\"foo\\": \\"bar\\",
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\\"qux\\": 2
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}
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}
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}"
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`)
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expect(toDisplayString(s)).toMatchInlineSnapshot(`
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"{
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\\"Set(3)\\": [
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1,
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{
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\\"foo\\": \\"bar\\"
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},
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{
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\\"Map(2)\\": {
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\\"1 =>\\": \\"foo\\",
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\\"[object Object] =>\\": {
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\\"foo\\": \\"bar\\",
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\\"qux\\": 2
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}
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}
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}
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]
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}"
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`)
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expect(
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toDisplayString({
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m,
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s
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})
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).toMatchInlineSnapshot(`
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"{
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\\"m\\": {
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\\"Map(2)\\": {
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\\"1 =>\\": \\"foo\\",
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\\"[object Object] =>\\": {
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\\"foo\\": \\"bar\\",
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\\"qux\\": 2
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}
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}
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},
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\\"s\\": {
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\\"Set(3)\\": [
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1,
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{
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\\"foo\\": \\"bar\\"
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},
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{
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\\"Map(2)\\": {
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\\"1 =>\\": \\"foo\\",
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\\"[object Object] =>\\": {
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\\"foo\\": \\"bar\\",
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\\"qux\\": 2
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}
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}
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}
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]
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}
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}"
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`)
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})
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})
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