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import { TraceSource } from "../log/TraceSource";
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import { Observable } from "../Observable";
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import { IObservable } from "../interfaces";
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import { delay, fork } from "../safe";
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import { test } from "./TestTraits";
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const trace = TraceSource.get("ObservableTests");
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test("events sequence example", async t => {
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let events: IObservable<number> | undefined;
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const done = new Promise<void>(resolve => {
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events = new Observable<number>(async (notify, fail, finish) => {
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for (let i = 0; i < 10; i++) {
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await fork();
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notify(i);
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}
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finish();
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resolve();
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});
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});
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let count = 0;
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let complete = false;
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if (!events)
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throw new Error("events === undefined");
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events.on(x => count = count + x, undefined, () => complete = true);
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const first = await events.next();
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t.equals(first, 0, "the first event");
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t.false(complete, "the sequence is not complete");
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await done;
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t.equals(count, 45, "the summ of the evetns");
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t.true(complete, "the sequence is complete");
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});
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test("event sequence termination", async t => {
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let events: IObservable<number> | undefined;
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const done = new Promise<void>(resolve => {
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events = new Observable<number>(async (notify, fail, complete) => {
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await fork();
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notify(1);
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complete();
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notify(2);
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complete();
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fail("Sequence terminated");
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resolve();
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});
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});
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if (!events)
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throw new Error("events === undefined");
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let count = 0;
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events.on(() => {}, e => count++, () => count++);
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const first = await events.next();
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t.equals(first, 1, "the first message");
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try {
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await events.next();
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t.fail("shoud throw an exception");
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} catch (e) {
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t.pass("the sequence is terminated");
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}
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await done;
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t.equals(count, 1, "the sequence must be terminated once");
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});
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