Function _test

test/jasmine/tests/histogram_test.js:1342–1365

(leftGap, rightGap, edges, calendar, expected)

describe('getBinSpanLabelRound', function() {
    function _test(leftGap, rightGap, edges, calendar, expected) {
        var ax = {type: 'not date'};
        // only date axes have any different treatment here. We could explicitly
        // test category
        if(calendar) {
            ax = {type: 'date', calendar: 'gregorian', range: [0, 1e7]};
            setConvert(ax);
        }

        var roundFn = getBinSpanLabelRound(leftGap, rightGap, edges, ax, calendar);

        var j = 0;
        var PREC = calendar ? 1 : 6;
        edges.forEach(function(edge, i) {
            if(i) {
                expect(roundFn(edge, true)).toBeCloseTo(expected[j], PREC, 'right ' + i);
                j++;
            }
            if(i < edges.length - 1) {
                expect(roundFn(edge)).toBeCloseTo(expected[j], PREC, 'left ' + i);
                j++;
            }
        });
    }

    it('works when the bin edges are round numbers and data are "continuous"', function() {
        _test(0.05, 0.3, [0, 2, 4, 6], false, [0, 1.9, 2, 3.9, 4, 5.9]);