Function check

test/jasmine/tests/geo_test.js:1482–1492

(p, hoverLabelCnt)

        fig.layout.geo.projection.rotation = {lon: -75, lat: 90};

        function check(p, hoverLabelCnt) {
            mouseEvent('mousemove', p[0], p[1]);

            var invert = gd._fullLayout.geo._subplot.projection.invert;
            var lonlat = invert(p);

            expect(d3SelectAll('g.hovertext').size())
                .toBe(hoverLabelCnt, 'for ' + lonlat);

            Lib.clearThrottle();
        }

        Plotly.newPlot(gd, fig).then(function() {
            var px = 255;