public List<SocketPortAllocation> getHostServerSocketPorts( String hostname ) {
    List<SocketPortAllocation> ports = hostServerSocketPortsMap.get( hostname );
    return ports == null ? Collections.emptyList() : Collections.unmodifiableList( ports );
  }
@Test
  public void getHostServerSocketPortsWithoutAllocatedPorts() {
    List<SocketPortAllocation> actualResult = transformationMap.getHostServerSocketPorts( TEST_HOST );
    assertNotNull( actualResult );
    assertTrue( actualResult.isEmpty() );
  }