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1 1 import { empty, observe, of } from "./observable";
2 2 import * as tap from "tap";
3 3 import { Cancellation } from "@implab/core-amd/Cancellation";
4 4 import { delay } from "@implab/core-amd/safe";
5 5
6 6 const subj1 = observe<number>(({ next, complete }) => {
7 7 next(1);
8 8 complete();
9 9 next(2);
10 10 });
11 11
12 12 const consumer1 = {
13 13 sum: 0,
14 14 next(v: number) {
15 15 this.sum += v;
16 16 }
17 17 };
18 18
19 19 subj1.subscribe(consumer1);
20 20 tap.equal(consumer1.sum, 1, "Should get only one value");
21 21
22 22 subj1.subscribe(consumer1);
23 23 tap.equal(consumer1.sum, 2, "Should get the value again");
24 24
25 25 const consumer2 = {
26 26 value: 0,
27 27 completed: false,
28 28 next(v: number) { this.value = v; },
29 29 complete() { this.completed = true; }
30 30 };
31 31
32 32 let maps = 0;
33 33
34 34 subj1
35 35 .map(v => {
36 36 tap.comment(`map1: ${v * 2}`);
37 37 maps++;
38 38 return v * 2;
39 39 })
40 40 .map(v => {
41 41 tap.comment(`map2: ${v * 2}`);
42 42 maps++;
43 43 return v * 2;
44 44 })
45 45 .map(v => {
46 46 tap.comment(`map3: ${v * 2}`);
47 47 maps++;
48 48 return v * 2;
49 49 })
50 50 .subscribe(consumer2);
51 51
52 52 tap.equal(consumer2.value, 8, "Should map");
53 53 tap.equal(maps, 3, "The map chain should not be executed after completion");
54 54 tap.ok(consumer2.completed, "The completion signal should pass through");
55 55
56 56 const subj2 = observe<number>(({ next, complete }) => {
57 57 [1, 2, 3, 4, 5].forEach(next);
58 58 complete();
59 59 return () => {
60 60 tap.comment("subj2: unsubscribe");
61 61 };
62 62 });
63 63
64 64 const consumer3 = {
65 65 even: 0,
66 66 odd: 0,
67 67 completed: false,
68 68 subscribed: 0,
69 69 unsubscribed: 0,
70 70 next(v: "even" | "odd") {
71 71 this[v]++;
72 72 },
73 73 complete() {
74 74 this.completed = true;
75 75 },
76 76 subscribe() {
77 77 this.subscribed++;
78 78 },
79 79 unsubscribe() {
80 80 this.unsubscribed++;
81 81 }
82 82 };
83 83
84 84
85 85 const subj3 = subj2.pipe<"even" | "odd">(self => observe(({ next, complete, error }) => {
86 86 consumer3.subscribe();
87 87 let count = 0;
88 88 const h = self.subscribe({
89 89 next: val => {
90 90 if (val % 2 === 0)
91 91 next("odd");
92 92 else
93 93 next("even");
94 94 if (++count === 4)
95 95 complete();
96 96 },
97 97 complete,
98 98 error
99 99 });
100 100 return () => {
101 101 consumer3.unsubscribe();
102 102 h.unsubscribe();
103 103 };
104 104 }));
105 105
106 106 subj3.subscribe(consumer3);
107 107
108 108 tap.equal(consumer3.odd, 2, "Should get 2 odd elements");
109 109 tap.equal(consumer3.even, 2, "Should get 2 even elements");
110 110 tap.ok(consumer3.completed, "The sequence should completed");
111 111 tap.equal(consumer3.subscribed, 1, "The subscription should be done once");
112 112 tap.equal(consumer3.unsubscribed, 1, "The cleanup should be done after completion");
113 113
114 114 subj2.reduce((a, b) => a + b).subscribe({
115 115 next: val => tap.comment("subj2: reduce =", val),
116 116 complete: () => tap.comment("subj2: complete")
117 117 });
118 118
119 119 tap.test("of(...) tests", async t => {
120 120 await subj2.reduce((a, b) => a + b).next()
121 121 .then(value => t.comment("subj2: next reduce=", value));
122 122
123 123 await subj2.next().then(val => t.equal(val, 1, "Should peek the first element"));
124 124
125 125 const cancelled = new Cancellation(cancel => cancel());
126 126 await t.rejects(subj2.next(cancelled), "Cancelled next() method should fail");
127 127
128 128 await t.rejects(empty.next(), "Empty sequence should fail to get next element");
129 129
130 130 await of(delay(1).then(() => 1), Promise.resolve(2), 3)
131 131 .reduce<number[]>((a, x) => [...a, x], [])
132 132 .next()
133 133 .then(res => t.same(res, [1, 2, 3], "of(...) should keep the order"));
134 134
135 135 const rejected = Promise.reject("DIE!");
136 136 rejected.catch(() => { }); // SAFE AND SOUND
137 137
138 138 await t.resolves(
139 139 of(Promise.resolve(1), rejected).next(),
140 140 "of(...) should emit non-rejected items"
141 141 );
142 142 await t.rejects(
143 143 of(1, Promise.reject("DIE!")).reduce((a) => a).next(),
144 144 "of(...) should terminate with error when a parameter is rejected"
145 145 );
146 146
147 147 t.same(await of(1,2,3).collect(), [1,2,3], ".collect() should return the collected sequence");
148 148 await t.rejects(of(1,2,3).collect(cancelled), ".collect() should support cancellation");
149 149
150 150 }).catch(() => { });
151 151
152 152 tap.test(".tap() tests", async t => {
153 153 const side: number[] = [];
154 154
155 155 of(1,2)
156 156 .tap({next: v => side.push(v), complete: () => side.push(0)})
157 157 .tap({next: v => side.push(v*v)})
158 158 .subscribe({});
159 159
160 160 t.same(side, [1,1,2,4,0], ".tap() should be called in the order of registration");
161 161
162 162 side.length = 0;
163 163
164 164 await new Promise<void>(resolve => {
165 165 of(1,2,delay(1).then(() => 3))
166 166 .tap({next: v => side.push(v)})
167 167 .tap({ next: v => v === 1 && resolve()})
168 168 .subscribe({});
169 169 });
170 170
171 171 t.same(side, [1,2], ".tap() should be processed synchronously");
172 172
173 }).catch(() => { });
174
175 tap.test(".while() tests", async t => {
176
177 const seq = of(1, 2, 3, 4).while(v => v <= 2);
178
179 t.same(await seq.collect(), [1, 2], "Should collect only taken elements");
180
181 const data: number[] = [];
182 let complete = 0;
183 seq.subscribe({
184 next: v => data.push(v),
185 complete: () => complete++
186 });
187
188 t.same(data, [1, 2], "Should receive only taken elements");
189 t.equal(complete, 1, "Complete should run once");
190
173 191 }).catch(() => {}); No newline at end of file
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