phpunit.xml

<?xml version="1.0" encoding="UTF-8"?>
<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.3/phpunit.xsd"
         bootstrap="vendor/autoload.php"
         colors="true"
>
    <testsuites>
        <testsuite name="Test Suite">
            <directory suffix="Test.php">./tests</directory>
        </testsuite>
    </testsuites>
    <source>
        <include>
            <directory suffix=".php">./app</directory>
            <directory suffix=".php">./src</directory>
        </include>
    </source>
    <php>
        <!-- ... other configuration settings ... -->
        <server name="APP_ENV" value="testing"/>
        <server name="APP_DEBUG" value="true"/>
        <server name="EXCHANGE_RATE_API_KEY" value="d32a3a3c8c28056b84ffa0e8"/>
    </php>
</phpunit>