forked from ReactiveX/rxjs
/
delayWhen-spec.ts
379 lines (323 loc) · 13 KB
/
delayWhen-spec.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
import { of, EMPTY, interval, take } from 'rxjs';
import { delayWhen, tap } from 'rxjs/operators';
import { TestScheduler } from 'rxjs/testing';
import { observableMatcher } from '../helpers/observableMatcher';
import { expect } from 'chai';
/** @test {delayWhen} */
describe('delayWhen', () => {
let testScheduler: TestScheduler;
beforeEach(() => {
testScheduler = new TestScheduler(observableMatcher);
});
it('should delay by duration selector', () => {
testScheduler.run(({ cold, hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' ---a---b---c--| ');
const expected = '-----a------c----(b|)';
const subs = ' ^-------------! ';
const selector = [
cold(' --x--| '),
cold(' ----------(x|)'),
cold(' -x--| '),
];
const selectorSubs = [
' ---^-! ',
' -------^---------! ',
' -----------^! ',
];
let idx = 0;
function durationSelector(x: any) {
return selector[idx++];
}
const result = e1.pipe(delayWhen(durationSelector));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(selector[0].subscriptions).toBe(selectorSubs[0]);
expectSubscriptions(selector[1].subscriptions).toBe(selectorSubs[1]);
expectSubscriptions(selector[2].subscriptions).toBe(selectorSubs[2]);
});
});
it('should delay by selector', () => {
testScheduler.run(({ cold, hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--| ');
const expected = ' ---a--b-| ';
const subs = ' ^-------! ';
const selector = cold('-x--| ');
// -x--|
// prettier-ignore
const selectorSubs = [
' --^! ',
' -----^! ',
];
const result = e1.pipe(delayWhen((x: any) => selector));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(selector.subscriptions).toBe(selectorSubs);
});
});
it('should raise error if source raises error', () => {
testScheduler.run(({ cold, hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--# ');
const expected = ' ---a-# ';
const subs = ' ^----! ';
const selector = cold(' -x--|');
const selectorSubs = '--^! ';
const result = e1.pipe(delayWhen((x: any) => selector));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(selector.subscriptions).toBe(selectorSubs);
});
});
it('should raise error if selector raises error', () => {
testScheduler.run(({ cold, hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--|');
const expected = ' ---# ';
const subs = ' ^--! ';
const selector = cold(' -# ');
const selectorSubs = '--^! ';
const result = e1.pipe(delayWhen((x: any) => selector));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(selector.subscriptions).toBe(selectorSubs);
});
});
it('should delay by selector and completes after value emits', () => {
testScheduler.run(({ cold, hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--| ');
const expected = ' ---------a--(b|)';
const subs = ' ^-------! ';
const selector = cold('-------x--| ');
// -------x--|
// prettier-ignore
const selectorSubs = [
' --^------! ',
' -----^------! '
];
const result = e1.pipe(delayWhen((x: any) => selector));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(selector.subscriptions).toBe(selectorSubs);
});
});
it('should delay, but not emit if the selector never emits a notification', () => {
testScheduler.run(({ cold, hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--| ');
const expected = ' -----------|';
const subs = ' ^-------! ';
const selector = cold('------| ');
// ------|
// prettier-ignore
const selectorSubs = [
' --^-----! ',
' -----^-----!'
];
const result = e1.pipe(delayWhen((x: any) => selector));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(selector.subscriptions).toBe(selectorSubs);
});
});
it('should not emit for async source and sync empty selector', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' a--|');
const expected = '---|';
const subs = ' ^--!';
const result = e1.pipe(delayWhen((x: any) => EMPTY));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
});
});
it('should not emit if selector never emits', () => {
testScheduler.run(({ cold, hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--|');
const expected = ' - ';
const subs = ' ^-------!';
const selector = cold('- ');
// -
// prettier-ignore
const selectorSubs = [
' --^ ',
' -----^ ',
];
const result = e1.pipe(delayWhen((x: any) => selector));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(selector.subscriptions).toBe(selectorSubs);
});
});
it('should delay by first value from selector', () => {
testScheduler.run(({ cold, hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--| ');
const expected = ' ------a--(b|) ';
const subs = ' ^-------! ';
const selector = cold('----x--y--| ');
// ----x--y--|
// prettier-ignore
const selectorSubs = [
' --^---! ',
' -----^---! ',
];
const result = e1.pipe(delayWhen((x: any) => selector));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(selector.subscriptions).toBe(selectorSubs);
});
});
it('should delay by selector that does not completes', () => {
testScheduler.run(({ cold, hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--| ');
const expected = ' ------a--(b|) ';
const subs = ' ^-------! ';
const selector = cold('----x-----y--- ');
// ----x-----y---
// prettier-ignore
const selectorSubs = [
' --^---! ',
' -----^---! '
];
const result = e1.pipe(delayWhen((x: any) => selector));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(selector.subscriptions).toBe(selectorSubs);
});
});
it('should raise error if selector throws', () => {
testScheduler.run(({ hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--|');
const e1subs = ' ^-! ';
const expected = '--# ';
const err = new Error('error');
const result = e1.pipe(
delayWhen(<any>((x: any) => {
throw err;
}))
);
expectObservable(result).toBe(expected, null, err);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should start subscription when subscription delay emits', () => {
testScheduler.run(({ cold, hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' -----a---b---| ');
const expected = ' -------a---b-| ';
const subs = ' ---^---------! ';
const selector = cold(' --x--| ');
// --x--|
// prettier-ignore
const selectorSubs = [
' -----^-! ',
' ---------^-! '
];
const subDelay = cold('---x--| ');
const subDelaySub = ' ^--! ';
const result = e1.pipe(delayWhen((x: any) => selector, subDelay));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(selector.subscriptions).toBe(selectorSubs);
expectSubscriptions(subDelay.subscriptions).toBe(subDelaySub);
});
});
it('should start subscription when subscription delay completes without emit value', () => {
testScheduler.run(({ cold, hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' -----a---b---| ');
const expected = ' -------a---b-| ';
const subs = ' ---^---------! ';
const selector = cold(' --x--| ');
// --x--|
// prettier-ignore
const selectorSubs = [
' -----^-! ',
' ---------^-! '
];
const subDelay = cold('---| ');
const subDelaySub = ' ^--! ';
const result = e1.pipe(delayWhen((x: any) => selector, subDelay));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(selector.subscriptions).toBe(selectorSubs);
expectSubscriptions(subDelay.subscriptions).toBe(subDelaySub);
});
});
it('should raise error when subscription delay raises error', () => {
testScheduler.run(({ cold, hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' -----a---b---|');
const expected = ' ---# ';
const selector = cold(' --x--| ');
const subDelay = cold('---# ');
const subDelaySub = ' ^--! ';
const result = e1.pipe(delayWhen((x: any) => selector, subDelay));
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe([]);
expectSubscriptions(selector.subscriptions).toBe([]);
expectSubscriptions(subDelay.subscriptions).toBe(subDelaySub);
});
});
it('should complete when duration selector returns synchronous observable', () => {
let next: boolean = false;
let complete: boolean = false;
of(1)
.pipe(delayWhen(() => of(2)))
.subscribe({ next: () => (next = true), complete: () => (complete = true) });
expect(next).to.be.true;
expect(complete).to.be.true;
});
it('should call predicate with indices starting at 0', () => {
testScheduler.run(({ cold, hot, expectObservable, expectSubscriptions }) => {
const e1 = hot(' --a--b--c--|');
const e1subs = ' ^----------!';
const expected = ' --a--b--c--|';
const selector = cold(' (x|)');
// (x|)
// (x|)
let indices: number[] = [];
const predicate = (value: string, index: number) => {
indices.push(index);
return selector;
};
const result = e1.pipe(delayWhen(predicate));
expectObservable(
result.pipe(
tap({
complete: () => {
expect(indices).to.deep.equal([0, 1, 2]);
},
})
)
).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
});
it('should delayWhen Promise resolves', (done) => {
const e1 = interval(1).pipe(take(5));
const expected = [0, 1, 2, 3, 4];
e1.pipe(delayWhen(() => Promise.resolve(42))).subscribe({
next: (x: number) => {
expect(x).to.equal(expected.shift());
},
error: () => {
done(new Error('should not be called'));
},
complete: () => {
expect(expected.length).to.equal(0);
done();
},
});
});
it('should raise error when Promise rejects', (done) => {
const e1 = interval(1).pipe(take(10));
const expected = [0, 1, 2];
const error = new Error('err');
e1.pipe(delayWhen((x) => (x === 3 ? Promise.reject(error) : Promise.resolve(42)))).subscribe({
next: (x: number) => {
expect(x).to.equal(expected.shift());
},
error: (err: any) => {
expect(err).to.be.an('error');
expect(expected.length).to.equal(0);
done();
},
complete: () => {
done(new Error('should not be called'));
},
});
});
});