voluptasquisquam/src/util/__tests__/histogram.js

Image processing and manipulation in JavaScript

import {mean as meanFromHistogram, median as medianFromHistogram} from '../histogram';
import 'should';

describe('we check histogram utilities', function () {
    it('should check meanFromHistogram', function () {
        meanFromHistogram([10, 10, 10, 10]).should.equal(1.5);
        meanFromHistogram([0, 2, 2, 0, 4, 0]).should.equal(2.75);
    });

    it('should check medianFromHistogram', function () {
        medianFromHistogram([10, 10, 10, 10]).should.equal(1.5);
        medianFromHistogram([0, 2, 2, 0, 4, 0]).should.equal(3);
    });

    it('should get the right value for medianFromHistogram with odd total', function () {
        medianFromHistogram([0, 0, 3, 0, 0]).should.equal(2);
        medianFromHistogram([0, 1, 1, 1, 0]).should.equal(2);
        medianFromHistogram([1, 1, 1, 0, 0]).should.equal(1);
        medianFromHistogram([1, 0, 0, 0, 0]).should.equal(0);
        medianFromHistogram([0, 0, 0, 0, 1]).should.equal(4);
        medianFromHistogram([0, 0, 3, 0]).should.equal(2);
        medianFromHistogram([0, 1, 1, 1]).should.equal(2);
        medianFromHistogram([1, 1, 1, 0]).should.equal(1);
        medianFromHistogram([1, 0, 0, 0]).should.equal(0);
        medianFromHistogram([0, 0, 0, 1]).should.equal(3);
    });

    it('should get the right value for medianFromHistogram with even total', function () {
        medianFromHistogram([0, 0, 4, 0, 0]).should.equal(2);
        medianFromHistogram([0, 1, 2, 1, 0]).should.equal(2);
        medianFromHistogram([1, 2, 1, 0, 0]).should.equal(1);
        medianFromHistogram([0, 0, 0, 0, 4]).should.equal(4);
        medianFromHistogram([0, 0, 1, 1, 0]).should.equal(2.5);
        medianFromHistogram([4, 0, 0, 0, 0]).should.equal(0);
        (() => medianFromHistogram([0, 0, 0, 0, 0])).should.throw(/unreachable/);
        medianFromHistogram([1, 0, 0, 0, 1]).should.equal(2);
    });
});