private void expectRebalance(final long offset,
                                 final List<String> assignedConnectors, final List<ConnectorTaskId> assignedTasks,
                                 String leader, String leaderUrl, boolean isLeader) {
        expectRebalance(Collections.emptyList(), Collections.emptyList(),
                ConnectProtocol.Assignment.NO_ERROR, offset, leader, leaderUrl, assignedConnectors, assignedTasks, 0, isLeader);
    }
Issues multiple rapid fencing requests for a handful of connectors, each of which takes a little while to complete.
This mimics what might happen when a few connectors are reconfigured in quick succession and each task for the
connector needs to hit the leader with a fencing request during its preflight check.
connect/runtime/src/test/java/org/apache/kafka/connect/runtime/distributed/DistributedHerderTest.java