@covers PHPUnit_Util_Diff::diffToArray
public function testComparisonErrorMessage_toArray() {
$diff = array();
$diff[] = array(
'a',
self::REMOVED,
);
$diff[] = array(
'b',
self::ADDED,
);
$this
->assertEquals($diff, PHPUnit_Util_Diff::diffToArray('a', 'b'));
}