postfixadmin/tests/CheckDomainTest.php

<?php


/**
 * Obviously replies on working DNS service
 */
class CheckDomainTest extends \PHPUnit\Framework\TestCase {
    public function testBasic() {
        $this->assertEquals('', check_domain('example.com'));
        $this->assertEquals('', check_domain('google.com'));
        $this->assertRegExp('/ not discoverable in DNS/', check_domain('fishbeansblahblahblah' . uniqid() . '.com'));
    }
}

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