adds an item to the order only on node B
    </p>
    <pre><code>
runOn(config.nodeB)(executeCommand(AddOrderItem(orderId, "item")))
    </code></pre>
    <p>
        At the end the <code>OrderManager</code> (on each node) must contain the
        same order.
    </p>
    <h3>Add item on both nodes simultaneously</h3>
    <p>
        The third test finally provokes a conflict by
    </p>
    <ol>
        <li>creating an order on nodeA (and waiting for replication)</li>
        <li>disconnecting both nodes (