var data = "X,Y,Y2,Y3\n" +
"1,-1,2,3";
var expectWarning = function(opts, badOptionName) {
DygraphOptions.resetWarnings_();
var warnings = getWarnings(graph, data, opts);
var data = "X,Y,Y2,Y3\n" +
"1,-1,2,3";
var expectWarning = function(opts, badOptionName) {
DygraphOptions.resetWarnings_();
var warnings = getWarnings(graph, data, opts);