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

Simple parallelization for EcmaScript

import {toArray} from "../../../../src/common/util/arrays";
import {rangeIterator} from "../../../../src/common/parallel/slave/range-iterator";

describe("rangeIterator", function () {
    it("returns an iterator containing the elements from start up to end (exclusive) increasing by step", function () {
        // arrange
        const iterator = rangeIterator(10, 20, 2);

        // act, assert
        expect(toArray(iterator)).toEqual([10, 12, 14, 16, 18]);
    });

    it("returns an iterator containing the elements from start up to end (exclusive) using a negative step size", function () {
        // arrange
        const iterator = rangeIterator(-10, -21, -2);

        // act, assert
        expect(toArray(iterator)).toEqual([-10, -12, -14, -16, -18]);
    });

    it("returns an iterator containing the elements from start up to end (exclusive) if the step size is fractional", function () {
        // arrange
        const iterator = rangeIterator(0, 1, 0.1);

        // act, assert
        expect(toArray(iterator)).toEqual([0, 0.1, 0.2, 0.30000000000000004, 0.4, 0.5, 0.6, 0.7, 0.7999999999999999, 0.8999999999999999]);
    });

    it("returns an empty iterator if step size is negative and end is larger than start", function () {
        // arrange
        const iterator = rangeIterator(10, 15, -1);

        // act, assert
        expect(toArray(iterator)).toEqual([]);
    });
});