Tests drupal_add_js() sets preproccess to FALSE when cache is also FALSE.
function testNoCache() {
drupal_add_library('system', 'drupal');
$javascript = drupal_add_js('core/misc/collapse.js', array(
'cache' => FALSE,
));
$this
->assertFalse($javascript['core/misc/collapse.js']['preprocess'], 'Setting cache to FALSE sets proprocess to FALSE when adding JavaScript.');
}