redioactive/dist/__tests__/filter.spec.js

Reactive streams for chaining overlapping promises.

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const redio_1 = __importDefault(require("../redio"));
describe('Filtering values in a stream', () => {
    test('Filters even values', async () => {
        await expect((0, redio_1.default)([1, 2, 3, 4, 5, 6])
            .filter((x) => x % 2 === 0)
            .toArray()).resolves.toEqual([2, 4, 6]);
    });
    test('Matches everything', async () => {
        await expect((0, redio_1.default)([1, 2, 3])
            .filter(() => true)
            .toArray()).resolves.toEqual([1, 2, 3]);
    });
    test('Matches nothing', async () => {
        await expect((0, redio_1.default)([1, 2, 3])
            .filter(() => false)
            .toArray()).resolves.toEqual([]);
    });
    test('Works with an empty stream', async () => {
        await expect((0, redio_1.default)([])
            .filter((x) => x % 2 === 0)
            .toArray()).resolves.toEqual([]);
    });
    test('Filters with promises', async () => {
        await expect((0, redio_1.default)([1, 2, 3, 4, 5, 6])
            .filter((x) => new Promise((resolve) => {
            setTimeout(() => {
                resolve(x % 2 === 0);
            }, 5);
        }))
            .toArray()).resolves.toEqual([2, 4, 6]);
    });
});