Tests unassigning a shortcut set.
function testShortcutSetUnassign() {
$new_set = $this
->generateShortcutSet($this
->randomName(10));
shortcut_set_assign_user($new_set, $this->shortcut_user);
shortcut_set_unassign_user($this->shortcut_user);
$current_set = shortcut_current_displayed_set($this->shortcut_user);
$default_set = shortcut_default_set($this->shortcut_user);
$this
->assertTrue($current_set->set_name == $default_set->set_name, "Successfully unassigned another user's shortcut set.");
}