parallel-es/test/common/parallel/slave/filter-iterator.specs.ts

Simple parallelization for EcmaScript

import {toIterator, toArray} from "../../../../src/common/util/arrays";
import {filterIterator} from "../../../../src/common/parallel/slave/filter-iterator";
import {IParallelTaskEnvironment} from "../../../../src/common/parallel";

describe("filterIterator", function () {
    let environment: IParallelTaskEnvironment;

    beforeEach(function () {
        environment = { taskIndex: 2, valuesPerTask: 2 };
    });

    it("returns an iterator only containing the elements where the predicate returned true", function () {
        // arrange
        const predicate = jasmine.createSpy("predicate").and.returnValues(true, true, false, true);
        const iterator = toIterator([1, 2, 3, 4]);

        // act
        const filtered = filterIterator(iterator, predicate, environment);

        // assert
        expect(toArray(filtered)).toEqual([1, 2, 4]);
    });
});