Function checkSegments

test/jasmine/tests/scatter_test.js:955–958

(exp, msg)

    it('updates line segments on redraw when having null values', function(done) {
        function checkSegments(exp, msg) {
            var lineSelection = d3Select(gd).selectAll('.scatterlayer .js-line');
            expect(lineSelection.size()).toBe(exp, msg);
        }

        Plotly.newPlot(gd, [{
            y: [1, null, 2, 3],