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| 1 | +import { describe, it } from 'node:test'; |
| 2 | +import { IllegalStateError, ValidationError } from '../errors'; |
| 3 | +import { AssertionError, assertTrue } from '../testing/assertions'; |
| 4 | +import { type Command, type Event } from '../typing'; |
| 5 | +import { DeciderSpecification } from './deciderSpecification'; |
| 6 | + |
| 7 | +type DoSomething = Command<'Do', { something: string }>; |
| 8 | +type SomethingHappened = Event<'Did', { something: string }>; |
| 9 | +type Entity = { something: string }; |
| 10 | + |
| 11 | +const decide = async ( |
| 12 | + { data: { something } }: DoSomething, |
| 13 | + _entity: Entity, |
| 14 | +): Promise<SomethingHappened | [] | [SomethingHappened]> => { |
| 15 | + const event: SomethingHappened = { type: 'Did', data: { something } }; |
| 16 | + |
| 17 | + if (something === 'Ignore!') return []; |
| 18 | + if (something === 'Array!') return [event]; |
| 19 | + if (something !== 'Yes!') throw new IllegalStateError('Nope!'); |
| 20 | + |
| 21 | + return Promise.resolve(event); |
| 22 | +}; |
| 23 | + |
| 24 | +const initialState = (): Entity => ({ something: 'Meh' }); |
| 25 | + |
| 26 | +const evolve = (_entity: Entity, _event: SomethingHappened): Entity => ({ |
| 27 | + something: 'Nothing', |
| 28 | +}); |
| 29 | + |
| 30 | +const given = DeciderSpecification.for({ |
| 31 | + decide: decide, |
| 32 | + evolve, |
| 33 | + initialState: initialState, |
| 34 | +}); |
| 35 | + |
| 36 | +void describe('AsyncDeciderSpecification', () => { |
| 37 | + void describe('then', () => { |
| 38 | + void it('then fails if returns event, but assertion has an empty array', async () => { |
| 39 | + try { |
| 40 | + await given([]) |
| 41 | + .when({ |
| 42 | + type: 'Do', |
| 43 | + data: { |
| 44 | + something: 'Yes!', |
| 45 | + }, |
| 46 | + }) |
| 47 | + .then([]); |
| 48 | + } catch (error) { |
| 49 | + assertTrue( |
| 50 | + error instanceof AssertionError && |
| 51 | + error.message === |
| 52 | + `Arrays lengths don't match:\nExpected: 1\nActual: 0`, |
| 53 | + ); |
| 54 | + } |
| 55 | + }); |
| 56 | + }); |
| 57 | + |
| 58 | + void describe('thenNothingHappened', () => { |
| 59 | + void it('thenNothingHappened succeeds if returns empty array', async () => { |
| 60 | + await given([]) |
| 61 | + .when({ |
| 62 | + type: 'Do', |
| 63 | + data: { |
| 64 | + something: 'Ignore!', |
| 65 | + }, |
| 66 | + }) |
| 67 | + .thenNothingHappened(); |
| 68 | + }); |
| 69 | + |
| 70 | + void it('thenNothingHappened fails if returns event', async () => { |
| 71 | + try { |
| 72 | + await given([]) |
| 73 | + .when({ |
| 74 | + type: 'Do', |
| 75 | + data: { |
| 76 | + something: 'Yes!', |
| 77 | + }, |
| 78 | + }) |
| 79 | + .thenNothingHappened(); |
| 80 | + } catch (error) { |
| 81 | + assertTrue( |
| 82 | + error instanceof AssertionError && |
| 83 | + error.message === |
| 84 | + `Array is not empty [{"type":"Did","data":{"something":"Yes!"}}]:\nExpected: 1\nActual: 0`, |
| 85 | + ); |
| 86 | + } |
| 87 | + }); |
| 88 | + |
| 89 | + void it('thenNothingHappened fails if returns array of events', async () => { |
| 90 | + try { |
| 91 | + await given([]) |
| 92 | + .when({ |
| 93 | + type: 'Do', |
| 94 | + data: { |
| 95 | + something: 'Array!', |
| 96 | + }, |
| 97 | + }) |
| 98 | + .thenNothingHappened(); |
| 99 | + } catch (error) { |
| 100 | + assertTrue( |
| 101 | + error instanceof AssertionError && |
| 102 | + error.message === |
| 103 | + `Array is not empty [{"type":"Did","data":{"something":"Array!"}}]:\nExpected: 1\nActual: 0`, |
| 104 | + ); |
| 105 | + } |
| 106 | + }); |
| 107 | + }); |
| 108 | + |
| 109 | + void describe('thenThrows', () => { |
| 110 | + void it('check error was thrown', async () => { |
| 111 | + await given([]) |
| 112 | + .when({ |
| 113 | + type: 'Do', |
| 114 | + data: { |
| 115 | + something: 'Nope!', |
| 116 | + }, |
| 117 | + }) |
| 118 | + .thenThrows(); |
| 119 | + }); |
| 120 | + |
| 121 | + void it('checks error condition', async () => { |
| 122 | + await given([]) |
| 123 | + .when({ |
| 124 | + type: 'Do', |
| 125 | + data: { |
| 126 | + something: 'Nope!', |
| 127 | + }, |
| 128 | + }) |
| 129 | + .thenThrows((error) => error.message === 'Nope!'); |
| 130 | + }); |
| 131 | + |
| 132 | + void it('checks error type', async () => { |
| 133 | + await given([]) |
| 134 | + .when({ |
| 135 | + type: 'Do', |
| 136 | + data: { |
| 137 | + something: 'Nope!', |
| 138 | + }, |
| 139 | + }) |
| 140 | + .thenThrows(IllegalStateError); |
| 141 | + }); |
| 142 | + |
| 143 | + void it('checks error type and condition', async () => { |
| 144 | + await given([]) |
| 145 | + .when({ |
| 146 | + type: 'Do', |
| 147 | + data: { |
| 148 | + something: 'Nope!', |
| 149 | + }, |
| 150 | + }) |
| 151 | + .thenThrows(IllegalStateError, (error) => error.message === 'Nope!'); |
| 152 | + }); |
| 153 | + |
| 154 | + void it('fails if no error was thrown', async () => { |
| 155 | + try { |
| 156 | + await given([]) |
| 157 | + .when({ |
| 158 | + type: 'Do', |
| 159 | + data: { |
| 160 | + something: 'Yes!', |
| 161 | + }, |
| 162 | + }) |
| 163 | + .thenThrows(); |
| 164 | + } catch (error) { |
| 165 | + assertTrue( |
| 166 | + error instanceof AssertionError && |
| 167 | + error.message === 'Handler did not fail as expected', |
| 168 | + ); |
| 169 | + } |
| 170 | + }); |
| 171 | + |
| 172 | + void it('fails if wrong error type', async () => { |
| 173 | + try { |
| 174 | + await given([]) |
| 175 | + .when({ |
| 176 | + type: 'Do', |
| 177 | + data: { |
| 178 | + something: 'Nope!', |
| 179 | + }, |
| 180 | + }) |
| 181 | + .thenThrows(ValidationError); |
| 182 | + } catch (error) { |
| 183 | + assertTrue( |
| 184 | + error instanceof AssertionError && |
| 185 | + error.message.startsWith( |
| 186 | + 'Caught error is not an instance of the expected type:', |
| 187 | + ), |
| 188 | + ); |
| 189 | + } |
| 190 | + }); |
| 191 | + |
| 192 | + void it('fails if wrong error type and correct condition', async () => { |
| 193 | + try { |
| 194 | + await given([]) |
| 195 | + .when({ |
| 196 | + type: 'Do', |
| 197 | + data: { |
| 198 | + something: 'Nope!', |
| 199 | + }, |
| 200 | + }) |
| 201 | + .thenThrows(ValidationError, (error) => error.message === 'Nope!'); |
| 202 | + } catch (error) { |
| 203 | + assertTrue( |
| 204 | + error instanceof AssertionError && |
| 205 | + error.message.startsWith( |
| 206 | + 'Caught error is not an instance of the expected type:', |
| 207 | + ), |
| 208 | + ); |
| 209 | + } |
| 210 | + }); |
| 211 | + |
| 212 | + void it('fails if correct error type but wrong correct condition', async () => { |
| 213 | + try { |
| 214 | + await given([]) |
| 215 | + .when({ |
| 216 | + type: 'Do', |
| 217 | + data: { |
| 218 | + something: 'Nope!', |
| 219 | + }, |
| 220 | + }) |
| 221 | + .thenThrows(IllegalStateError, (error) => error.message !== 'Nope!'); |
| 222 | + } catch (error) { |
| 223 | + assertTrue( |
| 224 | + error instanceof AssertionError && |
| 225 | + error.message === |
| 226 | + `Error didn't match the error condition: Error: Nope!`, |
| 227 | + ); |
| 228 | + } |
| 229 | + }); |
| 230 | + }); |
| 231 | +}); |
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