62 lines
1.8 KiB
JavaScript
62 lines
1.8 KiB
JavaScript
import clone, { cloneInstance } from '@/utils/clone'
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describe('clone', () => {
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test('Basic objects stay the same', () => {
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const obj = { a: 123, b: 'hello' }
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expect(clone(obj)).toEqual(obj)
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})
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test('Basic nested objects stay the same', () => {
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const obj = { a: 123, b: { c: 'hello-world' } }
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expect(clone(obj)).toEqual(obj)
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})
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test('Simple pojo reference types are re-created', () => {
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const c = { c: 'hello-world' }
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expect(clone({ a: 123, b: c }).b === c).toBe(false)
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})
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test('Retains array structures inside of a pojo', () => {
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const obj = { a: 'abc', d: ['first', 'second'] }
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expect(Array.isArray(clone(obj).d)).toBe(true)
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})
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test('Removes references inside array structures', () => {
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const obj = { a: 'abc', d: ['first', { foo: 'bar' }] }
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expect(clone(obj).d[1] === obj.d[1]).toBe(false)
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})
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})
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describe('cloneInstance', () => {
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test('creates a copy of a class instance', () => {
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class Sample {
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constructor() {
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this.fieldA = 'fieldA'
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this.fieldB = 'fieldB'
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}
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doSomething () {}
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}
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const sample = new Sample()
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const copy = cloneInstance(sample)
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expect(sample === copy).toBeFalsy()
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expect(copy).toBeInstanceOf(Sample)
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expect(copy.fieldA).toEqual('fieldA')
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expect(copy.fieldB).toEqual('fieldB')
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expect(copy.doSomething).toBeTruthy()
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expect(copy.doSomething).not.toThrow()
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})
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test('creates a broken copy of builtins', () => {
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const sample = new Date()
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const copy = cloneInstance(sample)
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expect(sample === copy).toBeFalsy()
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expect(copy).toBeInstanceOf(Date)
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expect(() => copy.toISOString()).toThrow()
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})
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})
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