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import { empty, observe, of } from "./observable";
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import * as tap from "tap";
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import { Cancellation } from "@implab/core-amd/Cancellation";
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import { delay } from "@implab/core-amd/safe";
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const subj1 = observe<number>(({ next, error, complete }) => {
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next(1);
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complete();
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next(2);
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next(3);
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error(new Error("This error should be ignored"));
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next(4);
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});
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const consumer1 = {
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sum: 0,
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next(v: number) {
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this.sum += v;
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}
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};
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subj1.subscribe(consumer1);
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tap.equal(consumer1.sum, 1, "Should get only one value");
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subj1.subscribe(consumer1);
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tap.equal(consumer1.sum, 2, "Should get the value again");
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const consumer2 = {
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value: 0,
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completed: false,
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next(v: number) { this.value = v; },
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complete() { this.completed = true; }
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};
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let maps = 0;
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subj1
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.map(v => {
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tap.comment(`map1: ${v * 2}`);
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maps++;
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return v * 2;
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})
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.map(v => {
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tap.comment(`map2: ${v * 2}`);
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maps++;
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return v * 2;
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})
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.map(v => {
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tap.comment(`map3: ${v * 2}`);
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maps++;
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return v * 2;
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})
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.subscribe(consumer2);
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tap.equal(consumer2.value, 8, "Should map");
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tap.equal(maps, 3, "The map chain should not be executed after completion");
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tap.ok(consumer2.completed, "The completion signal should pass through");
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const subj2 = observe<number>(({ next, complete }) => {
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[1, 2, 3, 4, 5].forEach(next);
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complete();
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return () => {
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tap.comment("subj2: unsubscribe");
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};
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});
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const consumer3 = {
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even: 0,
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odd: 0,
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completed: false,
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subscribed: 0,
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unsubscribed: 0,
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next(v: "even" | "odd") {
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this[v]++;
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},
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complete() {
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this.completed = true;
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},
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subscribe() {
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this.subscribed++;
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},
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unsubscribe() {
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this.unsubscribed++;
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}
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};
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const subj3 = subj2.pipe<"even" | "odd">(self => observe(({ next, complete, error }) => {
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consumer3.subscribe();
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let count = 0;
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const h = self.subscribe({
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next: val => {
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if (val % 2 === 0)
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next("odd");
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else
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next("even");
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if (++count === 4)
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complete();
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},
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complete,
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error
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});
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return () => {
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consumer3.unsubscribe();
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h.unsubscribe();
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};
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}));
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subj3.subscribe(consumer3);
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tap.equal(consumer3.odd, 2, "Should get 2 odd elements");
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tap.equal(consumer3.even, 2, "Should get 2 even elements");
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tap.ok(consumer3.completed, "The sequence should completed");
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tap.equal(consumer3.subscribed, 1, "The subscription should be done once");
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tap.equal(consumer3.unsubscribed, 1, "The cleanup should be done after completion");
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subj2.reduce((a, b) => a + b).subscribe({
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next: val => tap.comment("subj2: reduce =", val),
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complete: () => tap.comment("subj2: complete")
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});
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tap.test("of(...) tests", async t => {
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await subj2.reduce((a, b) => a + b).next()
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.then(value => t.comment("subj2: next reduce=", value));
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await subj2.next().then(val => t.equal(val, 1, "Should peek the first element"));
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const cancelled = new Cancellation(cancel => cancel());
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await t.rejects(subj2.next(cancelled), "Cancelled next() method should fail");
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await t.rejects(empty.next(), "Empty sequence should fail to get next element");
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await of(delay(1).then(() => 1), Promise.resolve(2), 3)
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.reduce<number[]>((a, x) => [...a, x], [])
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.next()
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.then(res => t.same(res, [1, 2, 3], "of(...) should keep the order"));
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const rejected = Promise.reject("DIE!");
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rejected.catch(() => { }); // SAFE AND SOUND
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await t.resolves(
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of(Promise.resolve(1), rejected).next(),
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"of(...) should emit non-rejected items"
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);
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await t.rejects(
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of(1, Promise.reject("DIE!")).reduce((a) => a).next(),
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"of(...) should terminate with error when a parameter is rejected"
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);
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t.same(await of(1, 2, 3).collect(), [1, 2, 3], ".collect() should return the collected sequence");
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await t.rejects(of(1, 2, 3).collect(cancelled), ".collect() should support cancellation");
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}).catch(() => { });
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tap.test(".tap() tests", async t => {
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const side: number[] = [];
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of(1, 2)
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.tap({ next: v => side.push(v), complete: () => side.push(0) })
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.tap({ next: v => side.push(v * v) })
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.subscribe({});
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t.same(side, [1, 1, 2, 4, 0], ".tap() should be called in the order of registration");
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side.length = 0;
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await new Promise<void>(resolve => {
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of(1, 2, delay(1).then(() => 3))
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.tap({ next: v => side.push(v) })
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.tap({ next: v => v === 1 && resolve() })
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.subscribe({});
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});
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t.same(side, [1, 2], ".tap() should be processed synchronously");
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}).catch(() => { });
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tap.test(".while() tests", async t => {
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const seq = of(1, 2, 3, 4).while(v => v <= 2);
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t.same(await seq.collect(), [1, 2], "Should collect only taken elements");
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const data: number[] = [];
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let complete = 0;
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seq.subscribe({
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next: v => data.push(v),
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complete: () => complete++
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});
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t.same(data, [1, 2], "Should receive only taken elements");
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t.equal(complete, 1, "Complete should run once");
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}).catch(() => { });
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