voluptasquisquam/src/image/utility/__tests__/getRowColumn.js

Image processing and manipulation in JavaScript

import {Image} from 'test/common';
import 'should';

describe('check getRow and getColumn class', function () {
    it('should yield the third row and third column for GREY image', function () {
        let image = new Image(5, 4,
            [
                0, 0, 0, 0, 0,
                0, 1, 1, 1, 1,
                0, 1, 2, 2, 2,
                0, 1, 3, 3, 3
            ],
            {kind: 'GREY'}
        );

        image.getRow(2).should.eql([0, 1, 2, 2, 2]);
        image.getColumn(2).should.eql([0, 1, 2, 3]);
    });

    it('should yield the first second and second column for GREY A image', function () {
        let image = new Image(3, 3,
            [
                0,  1,  2,  3,  4,  5,
                6,  7,  8,  9, 10, 11,
                12, 13, 14, 15, 16, 17
            ],
            {kind: 'GREYA'}
        );

        image.getRow(1, 0).should.eql([6, 8, 10]);
        image.getRow(1, 1).should.eql([7, 9, 11]);
        image.getColumn(1, 0).should.eql([2, 8, 14]);
        image.getColumn(1, 1).should.eql([3, 9, 15]);

        (function () {
            image.getRow(5);
        }).should.throw(/row should be included between 0 and 2/);

        (function () {
            image.getRow(1, 2);
        }).should.throw(/channel should be included between 0 and 1/);

        (function () {
            image.getColumn(5);
        }).should.throw(/column should be included between 0 and 2/);

        (function () {
            image.getColumn(1, 2);
        }).should.throw(/channel should be included between 0 and 1/);

    });

});