PHPUnit coverage: Allowed memory size of 536870912 bytes exhausted

Question

I am trying to generate code test coverage for my PHP project with PHPUnit and phpdbg using the following command:

phpdbg -dmemory_limit=512M -qrr ./bin/phpunit -c .phpunit.cover.xml

This works perfectly fine:

PHPUnit 6.2.4 by Sebastian Bergmann and contributors.

........                                                            8 / 8 (100%)

Time: 114 ms, Memory: 14.00MB

OK (8 tests, 13 assertions)

Generating code coverage report in HTML format ... done

However, when I use the exact same command in a docker container:

docker run -it --name YM4UPltmiPMjObaVULwsIPIkPL2bGL0T -e USER=sasan -v "/home/sasan/Project/phpredmin:/phpredmin" -w "/phpredmin" --user "1000:www-data" php:7.0-apache phpdbg -dmemory_limit=512M -qrr ./bin/phpunit -c .phpunit.cover.xml

I get the following error:

PHPUnit 6.2.4 by Sebastian Bergmann and contributors.

[PHP Fatal error:  Allowed memory size of 536870912 bytes exhausted (tried to allocate 561514763337856 bytes) in /phpredmin/vendor/phpunit/phpunit/src/Util/GlobalState.php on line 166]

I don't understand why PHPUnit needs to allocate 561514763337856 bytes of memory. I suspect it gets stuck in a loop, but why this does not happen outside of the container? Here is my PHP version on my machine:

PHP 7.0.22-0ubuntu0.17.04.1 (cli) (built: Aug  8 2017 22:03:30) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2017 Zend Technologies
    with Zend OPcache v7.0.22-0ubuntu0.17.04.1, Copyright (c) 1999-2017, by Zend Technologies

And here is the .phpunit.cover.xml file:

<phpunit
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/6.3/phpunit.xsd"
        backupGlobals="false"
        backupStaticAttributes="false"
        bootstrap="vendor/autoload.php"
        cacheTokens="false"
        colors="false"
        convertErrorsToExceptions="true"
        convertNoticesToExceptions="true"
        convertWarningsToExceptions="true"
        processIsolation="false"
        stopOnError="true"
        stopOnFailure="true"
        stopOnIncomplete="false"
        stopOnSkipped="false"
        stopOnRisky="false"
        timeoutForSmallTests="1"
        timeoutForMediumTests="10"
        timeoutForLargeTests="60"
        verbose="false">
    <testsuites>
            <testsuite name="PhpRedmin PHP source">
            <directory>src-test/</directory>
            </testsuite>
    </testsuites>
    <logging>
        <log type="coverage-html" target="cover/" lowUpperBound="35" 
highLowerBound="70"/>
    </logging>
    <filter>
        <whitelist processUncoveredFilesFromWhitelist="true">
            <directory suffix=".php">src-test/</directory>
            <directory suffix=".php">src/</directory>
        </whitelist>
    </filter>
</phpunit>

-- Edit1 --

I found that it has something to do with @runInSeparateProcess. When I remove the test that has @runInSeparateProcess then it starts to work. But still I don't know what is the problem

-- Edit2 --

Also I found out that If I don't mount my code directory in the Docker container everything works fine

Answer 1

Add '-d memory_limit=-1' before your test

if use composer use the below code

./vendor/bin/simple-phpunit -d memory_limit=-1 tests/

if you use phpdbg use the below code

phpdbg -d memory_limit=-1 -qrr vendor/bin/phpunit --coverage-text