Function _assertVisibleData

test/jasmine/tests/parcoords_test.js:704–718

(visible, msg)

    });

    function _assertVisibleData(visible, msg) {
        return function() {
            var canvases = d3SelectAll('.gl-canvas');
            expect(canvases.size()).toBe(3, msg);
            canvases.each(function() {
                var imageArray = readPixel(this, 0, 0, this.width, this.height);
                var foundPixel = false;
                var i = 0;
                do {
                    foundPixel = foundPixel || imageArray[i++] !== 0;
                } while(!foundPixel && i < imageArray.length);
                expect(foundPixel).toBe(visible, msg + ' - ' + this.className);
            });
        };
    }

    it('@gl Calling `Plotly.restyle` with zero panels left should erase lines', function(done) {
        var mockCopy = Lib.extendDeep({}, mock2);