test.js

const assert = require('assert');
const niceTicks = require('../dist/nice-ticks.js');

describe('nice ticks', function() {

    it('nice int', function() {

        assert.equal(niceTicks(0.81, 12.3).join(', '), '0, 5, 10, 15');

        assert.equal(niceTicks(5, 96, 5).join(', '), '0, 20, 40, 60, 80, 100');

        assert.equal(niceTicks(5, 96, 4).join(', '), '0, 50, 100');

        assert.equal(niceTicks(5, 96, 3).join(', '), '0, 50, 100');

        assert.equal(niceTicks(1, 91, 2).join(', '), '0, 100');

        assert.equal(niceTicks(3.33, 12.66).join(', '), '0, 5, 10, 15');

    });

    it('nice float', function() {

        assert.equal(niceTicks(105.60, 543.80, 5).join(', '), '100, 200, 300, 400, 500, 600');

        assert.equal(niceTicks(0.60, 3.80, 5).join(', '), '0, 1, 2, 3, 4');

        assert.equal(niceTicks(0.10, 0.23, 5).join(', '), '0.1, 0.15, 0.2, 0.25');

        assert.equal(niceTicks(2.03, 2.17, 5).join(', '), '2, 2.05, 2.1, 2.15, 2.2');

    });

    it('nice negative', function() {

        assert.equal(niceTicks(-0.60, -0.45).join(', '), '-0.6, -0.55, -0.5, -0.45');

        assert.equal(niceTicks(-88.60, 3.80, 5).join(', '), '-100, -80, -60, -40, -20, 0, 20');

        assert.equal(niceTicks(-23456.60, 64223.80, 5).join(', '), '-40000, -20000, 0, 20000, 40000, 60000, 80000');

    });

    it('nice equal or invert', function() {

        assert.equal(niceTicks(1, 1, 5).join(', '), '1, 1.2, 1.4, 1.6, 1.8, 2');

        assert.equal(niceTicks(2, 1, 5).join(', '), '1, 1.2, 1.4, 1.6, 1.8, 2');

    });

    it('nice NaN', function() {

        assert.equal(niceTicks('1', '20', 5).join(', '), '0, 5, 10, 15, 20');

        assert.equal(niceTicks('2', NaN, 5).join(', '), '0, 0.5, 1, 1.5, 2');

    });

});