Fix unit tests

PHPUnit 4.0.17 by Sebastian Bergmann.

Configuration read from /home/fox/src/php/ezsystems/zetacomponents/Debug/phpunit.xml.dist

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Time: 687 ms, Memory: 6.00Mb

OK (65 tests, 192 assertions)

Yes of course, it must be uncommented only when generating the expected output files (see https://github.com/zetacomponents/Debug/blob/master/tests/formatters/html_formatter_test.php#L57)