QUnit.config.urlConfig.push({
  id: "jquery",
  label: "jQuery version",
  value: ["3.2.1", "3.2.0", "3.1.1", "3.0.0", "2.2.4", "2.1.4", "2.0.3", "1.12.4", "1.11.3"],
  tooltip: "What jQuery Core version to test against"
});

/* Hijacks normal form submit; lets it submit to an iframe to prevent
 * navigating away from the test suite
 */
$(document).on('submit', function(e) {
  if (!e.isDefaultPrevented()) {
    var form = $(e.target), action = form.attr('action'),
        name = 'form-frame' + jQuery.guid++,
        iframe = $('<iframe name="' + name + '" />');

    if (action && action.indexOf('iframe') < 0) form.attr('action', action + '?iframe=true')
    form.attr('target', name);
    $('#qunit-fixture').append(iframe);
    form.trigger('iframe:loading');
  }
});

QUnit.config.urlConfig.push({
  id: "jquery",
  label: "jQuery version",
  value: ["3.2.1", "3.2.1.slim", "3.1.1", "3.1.1.slim", "3.0.0", "3.0.0.slim", "2.2.4", "2.1.4", "2.0.3", "1.12.4", "1.11.3"],
  tooltip: "What jQuery Core version to test against"
});

/* Hijacks normal form submit; lets it submit to an iframe to prevent
 * navigating away from the test suite
 */
$(document).on('submit', function(e) {
  if (!e.isDefaultPrevented()) {
    var form = $(e.target), action = form.attr('action'),
        name = 'form-frame' + jQuery.guid++,
        iframe = $('<iframe name="' + name + '" />');

    if (action && action.indexOf('iframe') < 0) form.attr('action', action + '?iframe=true')
    form.attr('target', name);
    $('#qunit-fixture').append(iframe);
    form.trigger('iframe:loading');
  }
});

Test against jQuery slim 3.x
Test against jQuery slim 3.x