Must provide --whitelist even when Xdebug whitelist script is used

[rask]

Q	A
PHPUnit version	8.*
PHP version	7.3
Installation Method	Any

When using Xdebug coverage filter via the --prepend argument, PHPUnit still requires the --whitelist argument in order to generate code coverage.

$ cat ./filter.php
<?php

\xdebug_set_filter(
    \XDEBUG_FILTER_CODE_COVERAGE,
    \XDEBUG_PATH_WHITELIST,
    ['/path/to/project/src']
);

$ phpunit --prepend=./filter.php ./tests/suite --coverage-html=./coverage
> ...
> Error: Incorrect whitelist config, no code coverage will be generated.
> ...

When I provide the --whitelist argument, it works:

$ phpunit --dump-xdebug-filter=./filter.php
$ phpunit --prepend=./filter.php ./tests/suite --coverage-html=./coverage --whitelist=/path/to/project/src
> ...

---

Or is this the way it is intended to work?

[sebastianbergmann]

At the moment, yes, this is the way it must be. Not sure we can remove the need for the redundancy here (in a robust way).

[sebastianbergmann]

I am closing this because of #4226 (and #4227).