Tests adding a JavaScript file with a different group.
function testDifferentGroup() {
drupal_add_library('system', 'drupal');
$javascript = drupal_add_js('core/misc/collapse.js', array(
'group' => JS_THEME,
));
$this
->assertEqual($javascript['core/misc/collapse.js']['group'], JS_THEME, 'Adding a JavaScript file with a different group caches the given group.');
}