Test drupal_get_js() with a footer scope.
function testFooterHTML() {
$inline = 'jQuery(function () { });';
drupal_add_js($inline, array(
'type' => 'inline',
'scope' => 'footer',
));
$javascript = drupal_get_js('footer');
$this
->assertTrue(strpos($javascript, $inline) > 0, 'Rendered JavaScript footer returns the inline code.');
}