How to assert an email was sent?

public function test_can_send_email()
{
    Mail::fake();

    Mail::send([], [], function (\Illuminate\Mail\Message $message) {
        return $message
            ->from('[email protected]')
            ->to('[email protected]')
            ->subject('test');
    });

    Mail::assertSentCount(1);
    Mail::assertQueuedCount(1);
}

Both my assertions keep failing, how should I assert instead?