@Test
public void cellsWithNoRulesCanExist() {

    TitusFederationConfiguration titusFederationConfiguration = mock(TitusFederationConfiguration.class);
    when(titusFederationConfiguration.getCells()).thenReturn("cell1=hostName1:7001;cell2=hostName2:7002");
    when(titusFederationConfiguration.getRoutingRules()).thenReturn("cell1=(app1.*|app2.*)");
    CellInfoResolver cellInfoResolver = new DefaultCellInfoResolver(titusFederationConfiguration);
    ApplicationCellRouter cellRouter = new ApplicationCellRouter(cellInfoResolver, titusFederationConfiguration);
    Cell cell = cellRouter.routeKey(APP_2).get();
    assertThat(cell.getName()).isEqualTo("cell1");
}