c3/spec/zoom-spec.js

describe('c3 chart zoom', function () {
    'use strict';

    var chart;

    var args = {
        data: {
            columns: [
                ['data1', 30, 200, 100, 400, 3150, 250],
                ['data2', 50, 20, 10, 40, 15, 6025]
            ]
        },
        zoom: {
            enabled: true,
            initialRange: [1, 2]
        },
        subchart: {
            show: true
        }
    };

    beforeEach(function (done) {
        chart = window.initChart(chart, args, done);
    });

    describe('default extent', function () {

        describe('main chart domain', function () {

            it('should have original y domain', function () {
                var yDomain = chart.internal.y.domain(),
                    expectedYDomain = [-591.5, 6626.5];
                expect(yDomain[0]).toBe(expectedYDomain[0]);
                expect(yDomain[1]).toBe(expectedYDomain[1]);
            });

        });

        describe('main chart domain', function () {

            it('should have original y domain in subchart', function () {
                var yDomain = chart.internal.y.domain(),
                    subYDomain = chart.internal.subY.domain();
                expect(subYDomain[0]).toBe(yDomain[0]);
                expect(subYDomain[1]).toBe(yDomain[1]);
            });

        });

        describe('main chart domain', function () {

            it('should have specified brush extent', function () {
                var brushSelection = chart.internal.brush.selectionAsValue(),
                    expectedBrushSelection = [1, 2];
                expect(brushSelection[0]).toBeCloseTo(expectedBrushSelection[0], 1);
                expect(brushSelection[1]).toBeCloseTo(expectedBrushSelection[1], 1);
            });

        });

    });

});