.env.testing not loaded

I want to use two connections: mysql for local dev, sqlite for testing. I configured this in .env and .env.testing

The issue is that it always takes the connection of the .env file

Any ideas where i can look?

php artisan migrate --env=testing gives [PDOException] SQLSTATE[HY000] [2002] Connection refused

phpunit.xml

<?xml version="1.0" encoding="UTF-8"?>
<phpunit backupGlobals="false"
         backupStaticAttributes="false"
         bootstrap="bootstrap/autoload.php"
         colors="true"
         convertErrorsToExceptions="true"
         convertNoticesToExceptions="true"
         convertWarningsToExceptions="true"
         processIsolation="false"
         stopOnFailure="false">
    <testsuites>
        <testsuite name="Application Test Suite">
            <directory suffix="Test.php">./tests</directory>
        </testsuite>
    </testsuites>
    <filter>
        <whitelist processUncoveredFilesFromWhitelist="true">
            <directory suffix=".php">./app</directory>
            <exclude>
                <file>./app/Http/routes.php</file>
            </exclude>
        </whitelist>
    </filter>
    <php>
        <env name="APP_ENV" value="testing" override="true"/>
        <env name="DB_CONNECTION" value="sqlite" override="true"/>
    </php>
    <listeners>
        <listener class="\Mockery\Adapter\Phpunit\TestListener"></listener>
    </listeners>
</phpunit>

testcase

public function createApplication()
    {
        $app = require __DIR__.'/../bootstrap/app.php';
        $app->loadEnvironmentFrom('.env.testing');

        $app->make(Illuminate\Contracts\Console\Kernel::class)->bootstrap();

        return $app;
    }

    public function setUp()
    {
        parent::setUp();
        $this->prepareForTests();
    }
    private function prepareForTests()
    {
        Artisan::call('migrate');
        Artisan::call('db:seed');
    }

    public function tearDown()
    {
        parent::tearDown();
    }