<phpunit bootstrap="tests/bootstrap.php"
         backupGlobals="false"
         backupStaticAttributes="false"
         colors="true"
         columns="max"
         verbose="true"
         convertErrorsToExceptions="true"
         convertNoticesToExceptions="true"
         convertWarningsToExceptions="true"
         processIsolation="false"
         stopOnFailure="false">
    <filter>
        <blacklist>
            <directory>vendor</directory>
            <directory>classes/OpenCFP/Provider</directory>
        </blacklist>
    </filter>

    <testsuites>
        <testsuite name="all">
            <directory>tests</directory>
        </testsuite>
        <testsuite name="unit">
            <directory>tests/unit</directory>
        </testsuite>
        <testsuite name="framework">
            <directory>tests/OpenCFP</directory>
        </testsuite>
    </testsuites>

    <listeners>
        <listener class="JohnKary\PHPUnit\Listener\SpeedTrapListener">
            <arguments>
                <array>
                    <element key="slowThreshold">
                        <integer>300</integer>
                    </element>
                    <element key="reportLength">
                        <integer>5</integer>
                    </element>
                </array>
            </arguments>
        </listener>
    </listeners>
</phpunit>

<phpunit bootstrap="tests/bootstrap.php"
         backupGlobals="false"
         backupStaticAttributes="false"
         colors="true"
         columns="max"
         verbose="true"
         convertErrorsToExceptions="true"
         convertNoticesToExceptions="true"
         convertWarningsToExceptions="true"
         processIsolation="false"
         stopOnFailure="false">
    <filter>
        <whitelist>
            <directory>classes</directory>
        </whitelist>
    </filter>

    <testsuites>
        <testsuite name="all">
            <directory>tests</directory>
        </testsuite>
        <testsuite name="unit">
            <directory>tests/unit</directory>
        </testsuite>
        <testsuite name="framework">
            <directory>tests/OpenCFP</directory>
        </testsuite>
    </testsuites>

    <listeners>
        <listener class="JohnKary\PHPUnit\Listener\SpeedTrapListener">
            <arguments>
                <array>
                    <element key="slowThreshold">
                        <integer>300</integer>
                    </element>
                    <element key="reportLength">
                        <integer>5</integer>
                    </element>
                </array>
            </arguments>
        </listener>
    </listeners>
</phpunit>

Use a whitelist filter instead of blacklisting
Fix: Use a whitelist filter instead of blacklisting
