-
Notifications
You must be signed in to change notification settings - Fork 3k
/
withLatestFrom-spec.ts
269 lines (228 loc) · 9.63 KB
/
withLatestFrom-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
import {expect} from 'chai';
import * as Rx from '../../dist/cjs/Rx';
import {lowerCaseO} from '../helpers/test-helper';
import marbleTestingSignature = require('../helpers/marble-testing'); // tslint:disable-line:no-require-imports
declare const { asDiagram };
declare const hot: typeof marbleTestingSignature.hot;
declare const cold: typeof marbleTestingSignature.cold;
declare const expectObservable: typeof marbleTestingSignature.expectObservable;
declare const expectSubscriptions: typeof marbleTestingSignature.expectSubscriptions;
const Observable = Rx.Observable;
/** @test {withLatestFrom} */
describe('Observable.prototype.withLatestFrom', () => {
asDiagram('withLatestFrom')('should combine events from cold observables', () => {
const e1 = cold('-a--b-----c-d-e-|');
const e2 = cold('--1--2-3-4---| ');
const expected = '----B-----C-D-E-|';
const result = e1.withLatestFrom(e2, (a: string, b: string) => String(a) + String(b));
expectObservable(result).toBe(expected, { B: 'b1', C: 'c4', D: 'd4', E: 'e4' });
});
it('should merge the value with the latest values from the other observables into arrays', () => {
const e1 = hot('--a--^---b---c---d-|');
const e1subs = '^ !';
const e2 = hot('--e--^-f---g---h------|');
const e2subs = '^ !';
const e3 = hot('--i--^-j---k---l------|');
const e3subs = '^ !';
const expected = '----x---y---z-|';
const values = {
x: ['b', 'f', 'j'],
y: ['c', 'g', 'k'],
z: ['d', 'h', 'l']
};
const result = e1.withLatestFrom(e2, e3);
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should merge the value with the latest values from the other observables into ' +
'arrays and a project argument', () => {
const e1 = hot('--a--^---b---c---d-|');
const e1subs = '^ !';
const e2 = hot('--e--^-f---g---h------|');
const e2subs = '^ !';
const e3 = hot('--i--^-j---k---l------|');
const e3subs = '^ !';
const expected = '----x---y---z-|';
const values = {
x: 'bfj',
y: 'cgk',
z: 'dhl'
};
const project = function (a, b, c) { return a + b + c; };
const result = e1.withLatestFrom(e2, e3, project);
expectObservable(result).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should allow unsubscribing early and explicitly', () => {
const e1 = hot('--a--^---b---c---d-|');
const e1subs = '^ ! ';
const e2 = hot('--e--^-f---g---h------|');
const e2subs = '^ ! ';
const e3 = hot('--i--^-j---k---l------|');
const e3subs = '^ ! ';
const expected = '----x---y--- ';
const unsub = ' ! ';
const values = {
x: 'bfj',
y: 'cgk',
z: 'dhl'
};
const project = function (a, b, c) { return a + b + c; };
const result = e1.withLatestFrom(e2, e3, project);
expectObservable(result, unsub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', () => {
const e1 = hot('--a--^---b---c---d-|');
const e1subs = '^ ! ';
const e2 = hot('--e--^-f---g---h------|');
const e2subs = '^ ! ';
const e3 = hot('--i--^-j---k---l------|');
const e3subs = '^ ! ';
const expected = '----x---y--- ';
const unsub = ' ! ';
const values = {
x: 'bfj',
y: 'cgk',
z: 'dhl'
};
const project = function (a, b, c) { return a + b + c; };
const result = e1
.mergeMap((x: string) => Observable.of(x))
.withLatestFrom(e2, e3, project)
.mergeMap((x: string) => Observable.of(x));
expectObservable(result, unsub).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle empty', () => {
const e1 = cold( '|');
const e1subs = '(^!)';
const e2 = hot('--e--^-f---g---h----|');
const e2subs = '(^!)';
const e3 = hot('--i--^-j---k---l----|');
const e3subs = '(^!)';
const expected = '|'; // empty
const result = e1.withLatestFrom(e2, e3);
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle never', () => {
const e1 = cold('-');
const e1subs = '^ ';
const e2 = hot('--e--^-f---g---h----|');
const e2subs = '^ !';
const e3 = hot('--i--^-j---k---l----|');
const e3subs = '^ !';
const expected = '--------------------'; // never
const result = e1.withLatestFrom(e2, e3);
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle throw', () => {
const e1 = cold('#');
const e1subs = '(^!)';
const e2 = hot('--e--^-f---g---h----|');
const e2subs = '(^!)';
const e3 = hot('--i--^-j---k---l----|');
const e3subs = '(^!)';
const expected = '#'; // throw
const result = e1.withLatestFrom(e2, e3);
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle error', () => {
const e1 = hot('--a--^---b---#', undefined, new Error('boo-hoo'));
const e1subs = '^ !';
const e2 = hot('--e--^-f---g---h----|');
const e2subs = '^ !';
const e3 = hot('--i--^-j---k---l----|');
const e3subs = '^ !';
const expected = '----x---#'; // throw
const values = {
x: ['b', 'f', 'j']
};
const result = e1.withLatestFrom(e2, e3);
expectObservable(result).toBe(expected, values, new Error('boo-hoo'));
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle error with project argument', () => {
const e1 = hot('--a--^---b---#', undefined, new Error('boo-hoo'));
const e1subs = '^ !';
const e2 = hot('--e--^-f---g---h----|');
const e2subs = '^ !';
const e3 = hot('--i--^-j---k---l----|');
const e3subs = '^ !';
const expected = '----x---#'; // throw
const values = {
x: 'bfj'
};
const project = function (a, b, c) { return a + b + c; };
const result = e1.withLatestFrom(e2, e3, project);
expectObservable(result).toBe(expected, values, new Error('boo-hoo'));
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle merging with empty', () => {
const e1 = hot('--a--^---b---c---d-| ');
const e1subs = '^ ! ';
const e2 = cold( '|' );
const e2subs = '(^!)';
const e3 = hot('--i--^-j---k---l------|');
const e3subs = '^ ! ';
const expected = '--------------| ';
const result = e1.withLatestFrom(e2, e3);
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle merging with never', () => {
const e1 = hot('--a--^---b---c---d-| ');
const e1subs = '^ ! ';
const e2 = cold( '-' );
const e2subs = '^ ! ';
const e3 = hot('--i--^-j---k---l------|');
const e3subs = '^ ! ';
const expected = '--------------| ';
const result = e1.withLatestFrom(e2, e3);
expectObservable(result).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
expectSubscriptions(e2.subscriptions).toBe(e2subs);
expectSubscriptions(e3.subscriptions).toBe(e3subs);
});
it('should handle promises', (done: MochaDone) => {
Observable.of(1).delay(1).withLatestFrom(Promise.resolve(2), Promise.resolve(3))
.subscribe((x: any) => {
expect(x).to.deep.equal([1, 2, 3]);
}, null, done);
});
it('should handle arrays', () => {
Observable.of(1).delay(1).withLatestFrom([2, 3, 4], [4, 5, 6])
.subscribe((x: any) => {
expect(x).to.deep.equal([1, 4, 6]);
});
});
it('should handle lowercase-o observables', () => {
Observable.of(1).delay(1).withLatestFrom(lowerCaseO(2, 3, 4), lowerCaseO(4, 5, 6))
.subscribe((x: any) => {
expect(x).to.deep.equal([1, 4, 6]);
});
});
});