forked from ReactiveX/rxjs
-
Notifications
You must be signed in to change notification settings - Fork 0
/
bufferWhen-spec.ts
357 lines (308 loc) · 13.8 KB
/
bufferWhen-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
import { expect } from 'chai';
import { of, EMPTY } from 'rxjs';
import { bufferWhen, mergeMap, takeWhile } from 'rxjs/operators';
import { hot, cold, expectObservable, expectSubscriptions } from '../helpers/marble-testing';
declare function asDiagram(arg: string): Function;
/** @test {bufferWhen} */
describe('bufferWhen operator', () => {
asDiagram('bufferWhen')('should emit buffers that close and reopen', () => {
const e1 = hot('--a--^---b---c---d---e---f---g---------|');
const e2 = cold( '--------------(s|)');
// --------------(s|)
const expected = '--------------x-------------y-----(z|)';
const values = {
x: ['b', 'c', 'd'],
y: ['e', 'f', 'g'],
z: []
};
expectObservable(e1.pipe(bufferWhen(() => e2))).toBe(expected, values);
});
it('should emit buffers using constying cold closings', () => {
const e1 = hot('--a--^---b---c---d---e---f---g---h------| ');
const subs = '^ ! ';
const closings = [
cold( '---------------s--| '),
cold( '----------(s|) '),
cold( '-------------(s|)')];
const expected = '---------------x---------y---------(z|) ';
const values = {
x: ['b', 'c', 'd'],
y: ['e', 'f', 'g'],
z: ['h']
};
let i = 0;
const result = e1.pipe(bufferWhen(() => closings[i++]));
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
});
it('should emit buffers using constying hot closings', () => {
const e1 = hot('--a--^---b---c---d---e---f---g---h------| ');
const subs = '^ ! ';
const closings = [
{obs: hot( '-1--^--------------s---| '), // eslint-disable-line key-spacing
sub: '^ ! '}, // eslint-disable-line key-spacing
{obs: hot( '--1-^----3--------4----------s-| '), // eslint-disable-line key-spacing
sub: ' ^ ! '}, // eslint-disable-line key-spacing
{obs: hot( '1-2-^------3----4-------5--6-----------s--|'), // eslint-disable-line key-spacing
sub: ' ^ ! '}]; // eslint-disable-line key-spacing
const expected = '---------------x---------y---------(z|)';
const values = {
x: ['b', 'c', 'd'],
y: ['e', 'f', 'g'],
z: ['h']
};
let i = 0;
const result = e1.pipe(bufferWhen(() => closings[i++].obs));
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
for (let j = 0; j < closings.length; j++) {
expectSubscriptions(closings[j].obs.subscriptions).toBe(closings[j].sub);
}
});
it('should emit buffers using constying empty delayed closings', () => {
const e1 = hot('--a--^---b---c---d---e---f---g---h------| ');
const subs = '^ ! ';
const closings = [
cold( '---------------| '),
cold( '----------| '),
cold( '-------------|')];
const closeSubs = ['^ ! ',
' ^ ! ',
' ^ ! '];
const expected = '---------------x---------y---------(z|)';
const values = {
x: ['b', 'c', 'd'],
y: ['e', 'f', 'g'],
z: ['h']
};
let i = 0;
const result = e1.pipe(bufferWhen(() => closings[i++]));
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(closings[0].subscriptions).toBe(closeSubs[0]);
expectSubscriptions(closings[1].subscriptions).toBe(closeSubs[1]);
expectSubscriptions(closings[2].subscriptions).toBe(closeSubs[2]);
});
it('should emit buffers using constying cold closings, outer unsubscribed early', () => {
const e1 = hot('--a--^---b---c---d---e---f---g---h------| ');
const unsub = ' ! ';
const subs = '^ ! ';
const closings = [
cold( '---------------(s|) '),
cold( '----------(s|) '),
cold( '-------------(s|)')];
const closeSubs = ['^ ! ',
' ^ ! '];
const expected = '---------------x--- ';
const values = {
x: ['b', 'c', 'd']
};
let i = 0;
const result = e1.pipe(bufferWhen(() => closings[i++]));
expectObservable(result, unsub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(closings[0].subscriptions).toBe(closeSubs[0]);
expectSubscriptions(closings[1].subscriptions).toBe(closeSubs[1]);
expectSubscriptions(closings[2].subscriptions).toBe([]);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', () => {
const e1 = hot('--a--^---b---c---d---e---f---g---h------| ');
const subs = '^ ! ';
const closings = [
cold( '---------------(s|) '),
cold( '----------(s|) '),
cold( '-------------(s|)')];
const closeSubs = ['^ ! ',
' ^ ! '];
const expected = '---------------x--- ';
const unsub = ' ! ';
const values = {
x: ['b', 'c', 'd']
};
let i = 0;
const result = e1.pipe(
mergeMap((x: any) => of(x)),
bufferWhen(() => closings[i++]),
mergeMap((x: any) => of(x))
);
expectObservable(result, unsub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(closings[0].subscriptions).toBe(closeSubs[0]);
expectSubscriptions(closings[1].subscriptions).toBe(closeSubs[1]);
expectSubscriptions(closings[2].subscriptions).toBe([]);
});
it('should propagate error thrown from closingSelector', () => {
const e1 = hot('--a--^---b---c---d---e---f---g---h------| ');
const subs = '^ ! ';
const closings = [
cold( '---------------s--| '),
cold( '----------(s|) '),
cold( '-------------(s|)')];
const closeSubs0 = '^ ! ';
const expected = '---------------(x#) ';
const values = { x: ['b', 'c', 'd'] };
let i = 0;
const result = e1.pipe(
bufferWhen(() => {
if (i === 1) {
throw 'error';
}
return closings[i++];
})
);
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(closings[0].subscriptions).toBe(closeSubs0);
});
it('should propagate error emitted from a closing', () => {
const e1 = hot('--a--^---b---c---d---e---f---g---h------|');
const subs = '^ ! ';
const closings = [
cold( '---------------s--| '),
cold( '# ')];
const closeSubs = ['^ ! ',
' (^!) '];
const expected = '---------------(x#) ';
const values = { x: ['b', 'c', 'd'] };
let i = 0;
const result = e1.pipe(bufferWhen(() => closings[i++]));
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(closings[0].subscriptions).toBe(closeSubs[0]);
expectSubscriptions(closings[1].subscriptions).toBe(closeSubs[1]);
});
it('should propagate error emitted late from a closing', () => {
const e1 = hot('--a--^---b---c---d---e---f---g---h------|');
const subs = '^ ! ';
const closings = [
cold( '---------------s--| '),
cold( '------# ')];
const closeSubs = ['^ ! ',
' ^ ! '];
const expected = '---------------x-----# ';
const values = { x: ['b', 'c', 'd'] };
let i = 0;
const result = e1.pipe(bufferWhen(() => closings[i++]));
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
expectSubscriptions(closings[0].subscriptions).toBe(closeSubs[0]);
expectSubscriptions(closings[1].subscriptions).toBe(closeSubs[1]);
});
it('should handle errors', () => {
const e1 = hot('--a--^---b---c---d---e---f---#');
const e2 = cold( '---------------(s|)');
// ---------------(s|)
const e2subs = ['^ ! ',
' ^ !'];
const expected = '---------------x--------#';
const values = {
x: ['b', 'c', 'd']
};
const result = e1.pipe(bufferWhen(() => e2));
expectObservable(result).toBe(expected, values);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should handle empty', () => {
const e1 = cold('|');
const e2 = cold('--------(s|)');
const e1subs = '(^!)';
const expected = '(x|)';
const values = {
x: []
};
const result = e1.pipe(bufferWhen(() => e2));
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle throw', () => {
const e1 = cold('#');
const e2 = cold('--------(s|)');
const e1subs = '(^!)';
const expected = '#';
const values = {
x: []
};
const result = e1.pipe(bufferWhen(() => e2));
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should handle never', () => {
const e1 = hot('-');
const unsub = ' !';
const e1subs = '^ !';
const e2 = cold( '--------(s|) ');
const e2subs = ['^ ! ',
' ^ ! ',
' ^ ! ',
' ^ ! ',
' ^ ! ',
' ^ !'];
const expected = '--------x-------x-------x-------x-------x----';
const values = {
x: []
};
const source = e1.pipe(bufferWhen(() => e2));
expectObservable(source, unsub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should handle an inner never', () => {
const e1 = hot('--a--^---b---c---d---e---f---g---h------|');
const e2 = cold('-');
const expected = '-----------------------------------(x|)';
const values = {
x: ['b', 'c', 'd', 'e', 'f', 'g', 'h']
};
expectObservable(e1.pipe(bufferWhen(() => e2))).toBe(expected, values);
});
// bufferWhen is not supposed to handle a factory that returns always empty
// closing Observables, because doing such would constantly recreate a new
// buffer in a synchronous infinite loop until the stack overflows. This also
// happens with buffer in RxJS 4.
it('should NOT handle hot inner empty', (done: MochaDone) => {
const source = of(1, 2, 3, 4, 5, 6, 7, 8, 9);
const closing = EMPTY;
const TOO_MANY_INVOCATIONS = 30;
source.pipe(
bufferWhen(() => closing),
takeWhile((val: any, index: number) => index < TOO_MANY_INVOCATIONS)
).subscribe((val: any) => {
expect(Array.isArray(val)).to.be.true;
expect(val.length).to.equal(0);
}, (err: any) => {
done(new Error('should not be called'));
}, () => {
done();
});
});
it('should handle inner throw', () => {
const e1 = hot('--a--^---b---c---d---e---f---g---h------|');
const e1subs = '(^!)';
const e2 = cold( '#');
const e2subs = '(^!)';
const expected = '#';
const values = {
x: ['b', 'c', 'd', 'e', 'f', 'g', 'h']
};
const result = e1.pipe(bufferWhen(() => e2));
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
});
it('should handle disposing of source', () => {
const e1 = hot('--a--^---b---c---d---e---f---g---h------|');
const subs = '^ !';
const unsub = ' !';
const e2 = cold( '---------------(s|)');
// ---------------(s|)
const expected = '---------------x-----';
const values = {
x: ['b', 'c', 'd'],
y: ['e', 'f', 'g', 'h'],
z: []
};
const source = e1.pipe(bufferWhen(() => e2));
expectObservable(source, unsub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(subs);
});
});