Tests JavaScript versioning.
function testVersionQueryString() {
drupal_add_library('system', 'drupal');
drupal_add_js('core/misc/collapse.js', array(
'version' => 'foo',
));
drupal_add_js('core/misc/ajax.js', array(
'version' => 'bar',
));
$javascript = drupal_get_js();
$this
->assertTrue(strpos($javascript, 'core/misc/collapse.js?v=foo') > 0 && strpos($javascript, 'core/misc/ajax.js?v=bar') > 0, 'JavaScript version identifiers correctly appended to URLs');
}