HCOLL-134 changed the default so that is does not autoReconnectedUponDroppedConnection, however it better if most of the test cases have this can you can guarantee that the server is ready to accept TCP/IP before the client.

src/test/java/net/openhft/chronicle/map/Builder.java

@@ -73,7 +73,7 @@ public class Builder {
             final int serverPort,
             final InetSocketAddress... endpoints) throws IOException {
         TcpTransportAndNetworkConfig tcpConfig = TcpTransportAndNetworkConfig.of(serverPort, Arrays.asList(endpoints))
-                .heartBeatInterval(1L, TimeUnit.SECONDS);
+                .heartBeatInterval(1L, TimeUnit.SECONDS).autoReconnectedUponDroppedConnection(true);
         return ChronicleMapBuilder.of(kClass, vClass)
                 .replication(identifier, tcpConfig);
     }