Ensure that unmunge gets your name back.
function testUnMunge() {
$munged_name = file_munge_filename($this->name, '', FALSE);
$unmunged_name = file_unmunge_filename($munged_name);
$this
->assertIdentical($unmunged_name, $this->name, format_string('The unmunged (%unmunged) filename matches the original (%original)', array(
'%unmunged' => $unmunged_name,
'%original' => $this->name,
)));
}