@exadel/esl/modules/esl-utils/async/test/promise/defered.test.js

Exadel Smart Library (ESL) is the lightweight custom elements library that provide a set of super-flexible components

var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
import { createDeferred } from '../../promise/defered';
import { promisifyTimeout } from '../../promise/timeout';
describe('async/promise/deferred', () => {
    test('Resolve of Deferred produces resolved promise', () => {
        const def$$ = createDeferred();
        def$$.resolve(1);
        return def$$.promise.then((n) => expect(n).toBe(1));
    });
    test('Rejected Deferred produces rejected promise', () => {
        const def$$ = createDeferred();
        def$$.reject(1);
        return def$$.promise.catch((n) => expect(n).toBe(1));
    });
    test('Deferred resolves initially requested promise when resolved', () => {
        const def$$ = createDeferred();
        def$$.promise;
        def$$.resolve(1);
        return def$$.promise.then((n) => expect(n).toBe(1));
    });
    test('Deferred rejects initially requested promise when rejected', () => {
        const def$$ = createDeferred();
        def$$.promise;
        def$$.reject(1);
        return def$$.promise.catch((n) => expect(n).toBe(1));
    });
    describe('Rejected Deferred doesn`t lead to uncaught in promise', () => {
        const throwFn = jest.fn((reason) => { throw reason; });
        beforeAll(() => {
            process.env.LISTENING_TO_UNHANDLED_REJECTION = String(true);
            process.on('unhandledRejection', throwFn);
        });
        afterAll(() => {
            process.off('unhandledRejection', throwFn);
        });
        test('Deferred doesn`t lead to uncaught', () => __awaiter(void 0, void 0, void 0, function* () {
            const def$$ = createDeferred();
            def$$.reject(1);
            yield promisifyTimeout(0);
            expect(throwFn).not.toBeCalled();
        }));
    });
    describe('Resolved/rejected Deferred is finalized', () => {
        test('Resolved Deferred can not be re-resolved', () => {
            const def$$ = createDeferred();
            def$$.resolve(1);
            def$$.resolve(2);
            expect(def$$.promise).resolves.toBe(1);
        });
        test('Resolved Deferred can not be rejected', () => {
            const def$$ = createDeferred();
            def$$.resolve(1);
            def$$.reject();
            expect(def$$.promise).resolves.toBe(1);
        });
        test('Rejected Deferred can not be re-resolved', () => {
            const def$$ = createDeferred();
            def$$.reject(1);
            def$$.reject(2);
            expect(def$$.promise).rejects.toBe(1);
        });
        test('Rejected Deferred can not be rejected', () => {
            const def$$ = createDeferred();
            def$$.reject(1);
            def$$.resolve(2);
            expect(def$$.promise).rejects.toBe(1);
        });
    });
});