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| 1 | +/* global describe, it, expect */ |
| 2 | + |
| 3 | +import { SameLoopPromise } from '../../dist/lib/dynamic' |
| 4 | + |
| 5 | +describe('SameLoopPromise', () => { |
| 6 | + describe('basic api', () => { |
| 7 | + it('should support basic promise resolving', (done) => { |
| 8 | + const promise = new SameLoopPromise((resolve) => { |
| 9 | + setTimeout(() => { |
| 10 | + resolve(1000) |
| 11 | + }, 100) |
| 12 | + }) |
| 13 | + |
| 14 | + promise.then((value) => { |
| 15 | + expect(value).toBe(1000) |
| 16 | + done() |
| 17 | + }) |
| 18 | + }) |
| 19 | + |
| 20 | + it('should support resolving in the same loop', () => { |
| 21 | + let gotValue = null |
| 22 | + const promise = new SameLoopPromise((resolve) => { |
| 23 | + resolve(1000) |
| 24 | + }) |
| 25 | + |
| 26 | + promise.then((value) => { |
| 27 | + gotValue = value |
| 28 | + }) |
| 29 | + |
| 30 | + expect(gotValue).toBe(1000) |
| 31 | + }) |
| 32 | + |
| 33 | + it('should support basic promise rejecting', (done) => { |
| 34 | + const error = new Error('Hello Error') |
| 35 | + const promise = new SameLoopPromise((resolve, reject) => { |
| 36 | + setTimeout(() => { |
| 37 | + reject(error) |
| 38 | + }, 100) |
| 39 | + }) |
| 40 | + |
| 41 | + promise.catch((err) => { |
| 42 | + expect(err).toBe(error) |
| 43 | + done() |
| 44 | + }) |
| 45 | + }) |
| 46 | + |
| 47 | + it('should support rejecting in the same loop', () => { |
| 48 | + const error = new Error('Hello Error') |
| 49 | + let gotError = null |
| 50 | + const promise = new SameLoopPromise((resolve, reject) => { |
| 51 | + reject(error) |
| 52 | + }) |
| 53 | + |
| 54 | + promise.catch((err) => { |
| 55 | + gotError = err |
| 56 | + }) |
| 57 | + |
| 58 | + expect(gotError).toBe(error) |
| 59 | + }) |
| 60 | + }) |
| 61 | + |
| 62 | + describe('complex usage', () => { |
| 63 | + it('should support a chain of promises', (done) => { |
| 64 | + const promise = new SameLoopPromise((resolve) => { |
| 65 | + setTimeout(() => { |
| 66 | + resolve(1000) |
| 67 | + }, 100) |
| 68 | + }) |
| 69 | + |
| 70 | + promise |
| 71 | + .then((value) => value * 2) |
| 72 | + .then((value) => value + 10) |
| 73 | + .then((value) => { |
| 74 | + expect(value).toBe(2010) |
| 75 | + done() |
| 76 | + }) |
| 77 | + }) |
| 78 | + |
| 79 | + it('should handle the error inside the then', (done) => { |
| 80 | + const error = new Error('1000') |
| 81 | + const promise = new SameLoopPromise((resolve, reject) => { |
| 82 | + setTimeout(() => { |
| 83 | + reject(error) |
| 84 | + }, 100) |
| 85 | + }) |
| 86 | + |
| 87 | + promise |
| 88 | + .then( |
| 89 | + () => 4000, |
| 90 | + (err) => parseInt(err.message) |
| 91 | + ) |
| 92 | + .then((value) => value + 10) |
| 93 | + .then((value) => { |
| 94 | + expect(value).toBe(1010) |
| 95 | + done() |
| 96 | + }) |
| 97 | + }) |
| 98 | + |
| 99 | + it('should catch the error at the end', (done) => { |
| 100 | + const error = new Error('1000') |
| 101 | + const promise = new SameLoopPromise((resolve, reject) => { |
| 102 | + setTimeout(() => { |
| 103 | + reject(error) |
| 104 | + }, 100) |
| 105 | + }) |
| 106 | + |
| 107 | + promise |
| 108 | + .then((value) => value * 2) |
| 109 | + .then((value) => value + 10) |
| 110 | + .catch((err) => { |
| 111 | + expect(err).toBe(error) |
| 112 | + done() |
| 113 | + }) |
| 114 | + }) |
| 115 | + |
| 116 | + it('should catch and proceed', (done) => { |
| 117 | + const error = new Error('1000') |
| 118 | + const promise = new SameLoopPromise((resolve, reject) => { |
| 119 | + setTimeout(() => { |
| 120 | + reject(error) |
| 121 | + }, 100) |
| 122 | + }) |
| 123 | + |
| 124 | + promise |
| 125 | + .then((value) => value * 2) |
| 126 | + .then((value) => value + 10) |
| 127 | + .catch((err) => { |
| 128 | + expect(err).toBe(error) |
| 129 | + return 5000 |
| 130 | + }) |
| 131 | + .then((value) => { |
| 132 | + expect(value).toBe(5000) |
| 133 | + done() |
| 134 | + }) |
| 135 | + }) |
| 136 | + }) |
| 137 | +}) |
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