@Test
public void testApplyVpnUsersException1() {

    vpcVirtualRouterElement._vpcRouterMgr = _vpcRouterMgr;
    final AdvancedNetworkTopology advancedNetworkTopology = Mockito.mock(AdvancedNetworkTopology.class);
    final BasicNetworkTopology basicNetworkTopology = Mockito.mock(BasicNetworkTopology.class);
    networkTopologyContext.setAdvancedNetworkTopology(advancedNetworkTopology);
    networkTopologyContext.setBasicNetworkTopology(basicNetworkTopology);
    networkTopologyContext.init();
    final RemoteAccessVpn remoteAccessVpn = Mockito.mock(RemoteAccessVpn.class);
    final List<VpnUser> users = new ArrayList<VpnUser>();
    when(remoteAccessVpn.getVpcId()).thenReturn(null);
    try {
        final String [] results = vpcVirtualRouterElement.applyVpnUsers(remoteAccessVpn, users);
        assertNull(results);
    } catch (final ResourceUnavailableException e) {
        fail(e.getMessage());
    }
    verify(remoteAccessVpn, times(1)).getVpcId();
}