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import { Cancellation } from "@implab/core/Cancellation";
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import { first, isPromise, firstWhere, delay, nowait } from "@implab/core/safe";
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import { test } from "./TestTraits";
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test("await delay test", async t => {
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// schedule delay
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let resolved = false;
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let res = delay(0).then(() => resolved = true);
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t.false(resolved, "the delay should be async");
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await res;
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t.pass("await delay");
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// create cancellation token
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let cancel: (e?: any) => void;
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const ct = new Cancellation(c => cancel = c);
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// schedule delay
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resolved = false;
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res = delay(0, ct).then(() => resolved = true);
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t.false(resolved, "created delay with ct");
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// cancel
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cancel();
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try {
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await res;
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t.fail("the delay should fail when it is cancelled");
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} catch {
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t.pass("the delay is cancelled");
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}
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t.throws(() => {
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// try schedule delay after the cancellation is requested
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nowait(delay(0, ct));
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}, "Should throw if cancelled before start");
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});
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test("sequemce test", async t => {
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const sequence = ["a", "b", "c"];
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const empty = [];
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// synchronous tests
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t.equals(first(sequence), "a", "Should return the first element");
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t.equals(firstWhere(sequence, x => x === "b"), "b", "Should get the second element");
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let v: string;
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let e: Error;
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first(sequence, x => v = x);
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t.equal(v, "a", "The callback should be called for the first element");
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firstWhere(sequence, x => x === "b", x => v = x);
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t.equal(v, "b", "The callback should be called for the second element");
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t.throws(() => {
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first(empty);
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}, "Should throw when the sequence is empty");
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t.throws(() => {
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firstWhere(empty, x => x === "b");
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}, "Should throw when the sequence is empty");
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t.throws(() => {
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first(empty, x => v = x);
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}, "Should throw when the sequence is empty");
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t.throws(() => {
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firstWhere(empty, x => x === "b", x => v = x);
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}, "Should throw when the sequence is empty");
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t.throws(() => {
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firstWhere(sequence, x => x === "z");
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}, "Should throw when the element isn't found");
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t.throws(() => {
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firstWhere(sequence, x => x === "z", x => v = x);
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}, "Should throw when the element isn't found");
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first(empty, null, x => e = x);
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t.true(e, "The errorback should be called for the empty sequence");
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// async tests
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const asyncSequence = Promise.resolve(sequence);
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const asyncEmptySequence = Promise.resolve(empty);
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const promise = first(asyncSequence);
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t.true(isPromise(promise), "Should return promise");
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v = await promise;
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t.equal(v, "a", "Should return the first element");
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v = await new Promise(resolve => first(asyncSequence, resolve));
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t.equal(v, "a", "The callback should be called for the first element");
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});
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