postfixadmin/tests/CheckOwnerTest.php

<?php

class CheckOwnerTest extends \PHPUnit\Framework\TestCase
{
    public function testBasic()
    {
        $check = check_owner('random@example.com', 'test.com');
        $this->assertFalse($check, "there should be no entries in test.com as it's an invalid/non-existant domain");
    }
}

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