// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
package com.cloud.vm;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.mockito.ArgumentMatchers.anyLong;
import static org.mockito.ArgumentMatchers.anyMap;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.ArgumentMatchers.nullable;
import static org.mockito.Mockito.lenient;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.cloud.hypervisor.Hypervisor;
import com.cloud.storage.DiskOfferingVO;
import com.cloud.storage.VMTemplateVO;
import com.cloud.storage.VolumeVO;
import com.cloud.storage.dao.DiskOfferingDao;
import com.cloud.storage.dao.VMTemplateDao;
import org.apache.cloudstack.api.BaseCmd.HTTPMethod;
import org.apache.cloudstack.api.command.user.vm.UpdateVMCmd;
import org.apache.cloudstack.api.command.user.volume.ResizeVolumeCmd;
import org.apache.cloudstack.context.CallContext;
import org.apache.cloudstack.engine.orchestration.service.NetworkOrchestrationService;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.Spy;
import org.mockito.junit.MockitoJUnitRunner;
import org.powermock.core.classloader.annotations.PrepareForTest;

import com.cloud.dc.DataCenterVO;
import com.cloud.dc.dao.DataCenterDao;
import com.cloud.exception.InsufficientAddressCapacityException;
import com.cloud.exception.InsufficientCapacityException;
import com.cloud.exception.InvalidParameterValueException;
import com.cloud.exception.ResourceUnavailableException;
import com.cloud.network.NetworkModel;
import com.cloud.network.dao.NetworkDao;
import com.cloud.network.dao.NetworkVO;
import com.cloud.offering.ServiceOffering;
import com.cloud.service.ServiceOfferingVO;
import com.cloud.service.dao.ServiceOfferingDao;
import com.cloud.storage.GuestOSVO;
import com.cloud.storage.Storage;
import com.cloud.storage.dao.GuestOSDao;
import com.cloud.user.Account;
import com.cloud.user.AccountManager;
import com.cloud.user.AccountVO;
import com.cloud.user.UserVO;
import com.cloud.uservm.UserVm;
import com.cloud.vm.dao.NicDao;
import com.cloud.vm.dao.UserVmDao;
import com.cloud.vm.dao.UserVmDetailsDao;

@RunWith(MockitoJUnitRunner.class)
public class UserVmManagerImplTest {

    @Spy
    @InjectMocks
    private UserVmManagerImpl userVmManagerImpl = new UserVmManagerImpl();

    @Mock
    private ServiceOfferingDao _serviceOfferingDao;

    @Mock
    private DiskOfferingDao diskOfferingDao;

    @Mock
    private ServiceOfferingVO serviceOfferingVO;

    @Mock
    private DataCenterDao _dcDao;
    @Mock
    private DataCenterVO _dcMock;

    @Mock
    protected NicDao nicDao;

    @Mock
    private NetworkDao _networkDao;

    @Mock
    private NetworkOrchestrationService _networkMgr;

    @Mock
    private NetworkVO _networkMock;

    @Mock
    private GuestOSDao guestOSDao;

    @Mock
    private UserVmDao userVmDao;

    @Mock
    private UpdateVMCmd updateVmCommand;

    @Mock
    private AccountManager accountManager;

    @Mock
    private UserVmDetailsDao userVmDetailVO;

    @Mock
    private UserVmVO userVmVoMock;

    @Mock
    private NetworkModel networkModel;

    @Mock
    private Account accountMock;

    @Mock
    private AccountVO callerAccount;

    @Mock
    private UserVO callerUser;

    @Mock
    private VMTemplateDao templateDao;

    private long vmId = 1l;

    private static final long GiB_TO_BYTES = 1024 * 1024 * 1024;

    private Map<String, String> customParameters = new HashMap<>();

    private DiskOfferingVO smallerDisdkOffering = prepareDiskOffering(5l * GiB_TO_BYTES, 1l, 1L, 2L);
    private DiskOfferingVO largerDisdkOffering = prepareDiskOffering(10l * GiB_TO_BYTES, 2l, 10L, 20L);

    @Before
    public void beforeTest() {

        Mockito.when(updateVmCommand.getId()).thenReturn(vmId);

        when(_dcDao.findById(anyLong())).thenReturn(_dcMock);

        Mockito.when(userVmDao.findById(Mockito.eq(vmId))).thenReturn(userVmVoMock);

        Mockito.when(callerAccount.getType()).thenReturn(Account.ACCOUNT_TYPE_ADMIN);
        CallContext.register(callerUser, callerAccount);

        customParameters.put(VmDetailConstants.ROOT_DISK_SIZE, "123");
    }

    @After
    public void afterTest() {
        CallContext.unregister();
    }

    @Test
    public void validateGuestOsIdForUpdateVirtualMachineCommandTestOsTypeNull() {
        Mockito.when(updateVmCommand.getOsTypeId()).thenReturn(null);
        userVmManagerImpl.validateGuestOsIdForUpdateVirtualMachineCommand(updateVmCommand);
    }

    @Test(expected = InvalidParameterValueException.class)
    public void validateGuestOsIdForUpdateVirtualMachineCommandTestOsTypeNotFound() {
        Mockito.when(updateVmCommand.getOsTypeId()).thenReturn(1l);

        userVmManagerImpl.validateGuestOsIdForUpdateVirtualMachineCommand(updateVmCommand);
    }

    @Test
    public void validateGuestOsIdForUpdateVirtualMachineCommandTestOsTypeFound() {
        Mockito.when(updateVmCommand.getOsTypeId()).thenReturn(1l);
        Mockito.when(guestOSDao.findById(Mockito.eq(1l))).thenReturn(Mockito.mock(GuestOSVO.class));

        userVmManagerImpl.validateGuestOsIdForUpdateVirtualMachineCommand(updateVmCommand);
    }

    @Test(expected = InvalidParameterValueException.class)
    public void validateInputsAndPermissionForUpdateVirtualMachineCommandTestVmNotFound() {
        Mockito.when(userVmDao.findById(Mockito.eq(vmId))).thenReturn(null);

        userVmManagerImpl.validateInputsAndPermissionForUpdateVirtualMachineCommand(updateVmCommand);
    }

    private ServiceOfferingVO getSvcoffering(int ramSize) {
        String name = "name";
        String displayText = "displayText";
        int cpu = 1;
        int speed = 128;

        boolean ha = false;
        boolean useLocalStorage = false;

        ServiceOfferingVO serviceOffering = new ServiceOfferingVO(name, cpu, ramSize, speed, null, null, ha, displayText, Storage.ProvisioningType.THIN, useLocalStorage, false, null, false, null,
                false);
        return serviceOffering;
    }

    @Test
    @PrepareForTest(CallContext.class)
    public void validateInputsAndPermissionForUpdateVirtualMachineCommandTest() {
        Mockito.doNothing().when(userVmManagerImpl).validateGuestOsIdForUpdateVirtualMachineCommand(updateVmCommand);

        CallContext callContextMock = Mockito.mock(CallContext.class);

        Mockito.lenient().doReturn(accountMock).when(callContextMock).getCallingAccount();

        ServiceOffering offering = getSvcoffering(512);
        Mockito.lenient().when(_serviceOfferingDao.findById(Mockito.anyLong(), Mockito.anyLong())).thenReturn((ServiceOfferingVO) offering);
        Mockito.lenient().doNothing().when(accountManager).checkAccess(accountMock, null, true, userVmVoMock);
        userVmManagerImpl.validateInputsAndPermissionForUpdateVirtualMachineCommand(updateVmCommand);

        Mockito.verify(userVmManagerImpl).validateGuestOsIdForUpdateVirtualMachineCommand(updateVmCommand);
        Mockito.verify(accountManager).checkAccess(callerAccount, null, true, userVmVoMock);
    }

    @Test
    public void updateVirtualMachineTestDisplayChanged() throws ResourceUnavailableException, InsufficientCapacityException {
        configureDoNothingForMethodsThatWeDoNotWantToTest();
        ServiceOffering offering = getSvcoffering(512);
        Mockito.when(_serviceOfferingDao.findById(Mockito.anyLong(), Mockito.anyLong())).thenReturn((ServiceOfferingVO) offering);
        Mockito.when(userVmVoMock.isDisplay()).thenReturn(true);
        Mockito.doNothing().when(userVmManagerImpl).updateDisplayVmFlag(false, vmId, userVmVoMock);
        userVmManagerImpl.updateVirtualMachine(updateVmCommand);
        verifyMethodsThatAreAlwaysExecuted();

        Mockito.verify(userVmManagerImpl).updateDisplayVmFlag(false, vmId, userVmVoMock);
        Mockito.verify(userVmDetailVO, Mockito.times(0)).removeDetails(vmId);
    }

    @Test
    public void updateVirtualMachineTestCleanUpTrue() throws ResourceUnavailableException, InsufficientCapacityException {
        configureDoNothingForMethodsThatWeDoNotWantToTest();
        ServiceOffering offering = getSvcoffering(512);
        Mockito.when(_serviceOfferingDao.findById(Mockito.anyLong(), Mockito.anyLong())).thenReturn((ServiceOfferingVO) offering);
        Mockito.when(updateVmCommand.isCleanupDetails()).thenReturn(true);
        Mockito.lenient().doNothing().when(userVmManagerImpl).updateDisplayVmFlag(false, vmId, userVmVoMock);
        Mockito.doNothing().when(userVmDetailVO).removeDetails(vmId);

        userVmManagerImpl.updateVirtualMachine(updateVmCommand);
        verifyMethodsThatAreAlwaysExecuted();
        Mockito.verify(userVmDetailVO).removeDetails(vmId);
        Mockito.verify(userVmManagerImpl, Mockito.times(0)).updateDisplayVmFlag(false, vmId, userVmVoMock);
    }

    @Test
    public void updateVirtualMachineTestCleanUpTrueAndDetailEmpty() throws ResourceUnavailableException, InsufficientCapacityException {
        prepareAndExecuteMethodDealingWithDetails(true, true);
    }

    @Test
    public void updateVirtualMachineTestCleanUpTrueAndDetailsNotEmpty() throws ResourceUnavailableException, InsufficientCapacityException {
        prepareAndExecuteMethodDealingWithDetails(true, false);
    }

    @Test
    public void updateVirtualMachineTestCleanUpFalseAndDetailsNotEmpty() throws ResourceUnavailableException, InsufficientCapacityException {
        prepareAndExecuteMethodDealingWithDetails(false, true);
    }

    @Test
    public void updateVirtualMachineTestCleanUpFalseAndDetailsEmpty() throws ResourceUnavailableException, InsufficientCapacityException {
        prepareAndExecuteMethodDealingWithDetails(false, false);
    }

    private void prepareAndExecuteMethodDealingWithDetails(boolean cleanUpDetails, boolean isDetailsEmpty) throws ResourceUnavailableException, InsufficientCapacityException {
        configureDoNothingForMethodsThatWeDoNotWantToTest();

        ServiceOffering offering = getSvcoffering(512);
        Mockito.when(_serviceOfferingDao.findById(Mockito.anyLong(), Mockito.anyLong())).thenReturn((ServiceOfferingVO) offering);

        List<NicVO> nics = new ArrayList<>();
        NicVO nic1 = mock(NicVO.class);
        NicVO nic2 = mock(NicVO.class);
        nics.add(nic1);
        nics.add(nic2);
        when(this.nicDao.listByVmId(Mockito.anyLong())).thenReturn(nics);
        when(_networkDao.findById(anyLong())).thenReturn(_networkMock);
        lenient().doNothing().when(_networkMgr).saveExtraDhcpOptions(anyString(), anyLong(), anyMap());
        HashMap<String, String> details = new HashMap<>();
        if(!isDetailsEmpty) {
            details.put("", "");
        }
        Mockito.when(updateVmCommand.getDetails()).thenReturn(details);
        Mockito.when(updateVmCommand.isCleanupDetails()).thenReturn(cleanUpDetails);

        configureDoNothingForDetailsMethod();

        userVmManagerImpl.updateVirtualMachine(updateVmCommand);
        verifyMethodsThatAreAlwaysExecuted();

        Mockito.verify(userVmVoMock, Mockito.times(cleanUpDetails || isDetailsEmpty ? 0 : 1)).setDetails(details);
        Mockito.verify(userVmDetailVO, Mockito.times(cleanUpDetails ? 1: 0)).removeDetails(vmId);
        Mockito.verify(userVmDao, Mockito.times(cleanUpDetails || isDetailsEmpty ? 0 : 1)).saveDetails(userVmVoMock);
        Mockito.verify(userVmManagerImpl, Mockito.times(0)).updateDisplayVmFlag(false, vmId, userVmVoMock);
    }

    private void configureDoNothingForDetailsMethod() {
        Mockito.lenient().doNothing().when(userVmManagerImpl).updateDisplayVmFlag(false, vmId, userVmVoMock);
        Mockito.doNothing().when(userVmDetailVO).removeDetails(vmId);
        Mockito.doNothing().when(userVmDao).saveDetails(userVmVoMock);
    }

    @SuppressWarnings("unchecked")
    private void verifyMethodsThatAreAlwaysExecuted() throws ResourceUnavailableException, InsufficientCapacityException {
        Mockito.verify(userVmManagerImpl).validateInputsAndPermissionForUpdateVirtualMachineCommand(updateVmCommand);
        Mockito.verify(userVmManagerImpl).getSecurityGroupIdList(updateVmCommand);

        Mockito.verify(userVmManagerImpl).updateVirtualMachine(nullable(Long.class), nullable(String.class), nullable(String.class), nullable(Boolean.class),
                nullable(Boolean.class), nullable(Long.class),
                nullable(String.class), nullable(Boolean.class), nullable(HTTPMethod.class), nullable(String.class), nullable(String.class), nullable(String.class), nullable(List.class),
                nullable(Map.class));

    }

    @SuppressWarnings("unchecked")
    private void configureDoNothingForMethodsThatWeDoNotWantToTest() throws ResourceUnavailableException, InsufficientCapacityException {
        Mockito.doNothing().when(userVmManagerImpl).validateInputsAndPermissionForUpdateVirtualMachineCommand(updateVmCommand);
        Mockito.doReturn(new ArrayList<Long>()).when(userVmManagerImpl).getSecurityGroupIdList(updateVmCommand);
        Mockito.lenient().doReturn(Mockito.mock(UserVm.class)).when(userVmManagerImpl).updateVirtualMachine(Mockito.anyLong(), Mockito.anyString(), Mockito.anyString(), Mockito.anyBoolean(),
                Mockito.anyBoolean(), Mockito.anyLong(),
                Mockito.anyString(), Mockito.anyBoolean(), Mockito.any(HTTPMethod.class), Mockito.anyString(), Mockito.anyString(), Mockito.anyString(), Mockito.anyListOf(Long.class),
                Mockito.anyMap());
    }

    @Test
    public void validateOrReplaceMacAddressTestMacAddressValid() throws InsufficientAddressCapacityException {
        configureValidateOrReplaceMacAddressTest(0, "01:23:45:67:89:ab", "01:23:45:67:89:ab");
    }

    @Test
    public void validateOrReplaceMacAddressTestMacAddressNull() throws InsufficientAddressCapacityException {
        configureValidateOrReplaceMacAddressTest(1, null, "01:23:45:67:89:ab");
    }

    @Test
    public void validateOrReplaceMacAddressTestMacAddressBlank() throws InsufficientAddressCapacityException {
        configureValidateOrReplaceMacAddressTest(1, " ", "01:23:45:67:89:ab");
    }

    @Test
    public void validateOrReplaceMacAddressTestMacAddressEmpty() throws InsufficientAddressCapacityException {
        configureValidateOrReplaceMacAddressTest(1, "", "01:23:45:67:89:ab");
    }

    @Test
    public void validateOrReplaceMacAddressTestMacAddressNotValidOption1() throws InsufficientAddressCapacityException {
        configureValidateOrReplaceMacAddressTest(1, "abcdef:gh:ij:kl", "01:23:45:67:89:ab");
    }

    @Test
    public void validateOrReplaceMacAddressTestMacAddressNotValidOption2() throws InsufficientAddressCapacityException {
        configureValidateOrReplaceMacAddressTest(1, "01:23:45:67:89:", "01:23:45:67:89:ab");
    }

    @Test
    public void validateOrReplaceMacAddressTestMacAddressNotValidOption3() throws InsufficientAddressCapacityException {
        configureValidateOrReplaceMacAddressTest(1, "01:23:45:67:89:az", "01:23:45:67:89:ab");
    }

    @Test
    public void validateOrReplaceMacAddressTestMacAddressNotValidOption4() throws InsufficientAddressCapacityException {
        configureValidateOrReplaceMacAddressTest(1, "@1:23:45:67:89:ab", "01:23:45:67:89:ab");
    }

    private void configureValidateOrReplaceMacAddressTest(int times, String macAddress, String expectedMacAddress) throws InsufficientAddressCapacityException {
        Mockito.when(networkModel.getNextAvailableMacAddressInNetwork(Mockito.anyLong())).thenReturn(expectedMacAddress);

        String returnedMacAddress = userVmManagerImpl.validateOrReplaceMacAddress(macAddress, 1l);

        Mockito.verify(networkModel, Mockito.times(times)).getNextAvailableMacAddressInNetwork(Mockito.anyLong());
        assertEquals(expectedMacAddress, returnedMacAddress);
    }

    @Test
    public void testValidatekeyValuePair() throws Exception {
        assertTrue(userVmManagerImpl.isValidKeyValuePair("is-a-template=true\nHVM-boot-policy=\nPV-bootloader=pygrub\nPV-args=hvc0"));
        assertTrue(userVmManagerImpl.isValidKeyValuePair("is-a-template=true HVM-boot-policy= PV-bootloader=pygrub PV-args=hvc0"));
        assertTrue(userVmManagerImpl.isValidKeyValuePair("nvp.vm-uuid=34b3d5ea-1c25-4bb0-9250-8dc3388bfa9b"));
        assertFalse(userVmManagerImpl.isValidKeyValuePair("key"));
        //key-1=value1, param:key-2=value2, my.config.v0=False"
        assertTrue(userVmManagerImpl.isValidKeyValuePair("key-1=value1"));
        assertTrue(userVmManagerImpl.isValidKeyValuePair("param:key-2=value2"));
        assertTrue(userVmManagerImpl.isValidKeyValuePair("my.config.v0=False"));
    }

    @Test
    public void configureCustomRootDiskSizeTest() {
        String vmDetailsRootDiskSize = "123";
        Map<String, String> customParameters = new HashMap<>();
        customParameters.put(VmDetailConstants.ROOT_DISK_SIZE, vmDetailsRootDiskSize);
        long expectedRootDiskSize = 123l * GiB_TO_BYTES;
        long offeringRootDiskSize = 0l;
        prepareAndRunConfigureCustomRootDiskSizeTest(customParameters, expectedRootDiskSize, 1, offeringRootDiskSize);
    }

    @Test(expected = InvalidParameterValueException.class)
    public void configureCustomRootDiskSizeTestExpectExceptionZero() {
        String vmDetailsRootDiskSize = "0";
        Map<String, String> customParameters = new HashMap<>();
        customParameters.put(VmDetailConstants.ROOT_DISK_SIZE, vmDetailsRootDiskSize);
        long expectedRootDiskSize = 0l;
        long offeringRootDiskSize = 0l;
        prepareAndRunConfigureCustomRootDiskSizeTest(customParameters, expectedRootDiskSize, 1, offeringRootDiskSize);
    }

    @Test(expected = InvalidParameterValueException.class)
    public void configureCustomRootDiskSizeTestExpectExceptionNegativeNum() {
        String vmDetailsRootDiskSize = "-123";
        Map<String, String> customParameters = new HashMap<>();
        customParameters.put(VmDetailConstants.ROOT_DISK_SIZE, vmDetailsRootDiskSize);
        long expectedRootDiskSize = -123l * GiB_TO_BYTES;
        long offeringRootDiskSize = 0l;
        prepareAndRunConfigureCustomRootDiskSizeTest(customParameters, expectedRootDiskSize, 1, offeringRootDiskSize);
    }

    @Test
    public void configureCustomRootDiskSizeTestEmptyParameters() {
        Map<String, String> customParameters = new HashMap<>();
        long expectedRootDiskSize = 99l * GiB_TO_BYTES;
        long offeringRootDiskSize = 0l;
        prepareAndRunConfigureCustomRootDiskSizeTest(customParameters, expectedRootDiskSize, 1, offeringRootDiskSize);
    }

    @Test
    public void configureCustomRootDiskSizeTestEmptyParametersAndOfferingRootSize() {
        Map<String, String> customParameters = new HashMap<>();
        long expectedRootDiskSize = 10l * GiB_TO_BYTES;
        long offeringRootDiskSize = 10l * GiB_TO_BYTES;;

        prepareAndRunConfigureCustomRootDiskSizeTest(customParameters, expectedRootDiskSize, 1, offeringRootDiskSize);
    }

    private void prepareAndRunConfigureCustomRootDiskSizeTest(Map<String, String> customParameters, long expectedRootDiskSize, int timesVerifyIfHypervisorSupports, Long offeringRootDiskSize) {
        VMTemplateVO template = Mockito.mock(VMTemplateVO.class);
        Mockito.when(template.getId()).thenReturn(1l);
        Mockito.when(template.getSize()).thenReturn(99L * GiB_TO_BYTES);
        ServiceOfferingVO offering = Mockito.mock(ServiceOfferingVO.class);
        Mockito.when(offering.getId()).thenReturn(1l);
        Mockito.when(templateDao.findById(Mockito.anyLong())).thenReturn(template);

        DiskOfferingVO diskfferingVo = Mockito.mock(DiskOfferingVO.class);
        Mockito.when(diskOfferingDao.findById(Mockito.anyLong())).thenReturn(diskfferingVo);

        Mockito.when(diskfferingVo.getDiskSize()).thenReturn(offeringRootDiskSize);

        long rootDiskSize = userVmManagerImpl.configureCustomRootDiskSize(customParameters, template, Hypervisor.HypervisorType.KVM, offering);

        Assert.assertEquals(expectedRootDiskSize, rootDiskSize);
        Mockito.verify(userVmManagerImpl, Mockito.times(timesVerifyIfHypervisorSupports)).verifyIfHypervisorSupportsRootdiskSizeOverride(Mockito.any());
    }

    @Test
    public void verifyIfHypervisorSupportRootdiskSizeOverrideTest() {
        Hypervisor.HypervisorType[] hypervisorTypeArray = Hypervisor.HypervisorType.values();
        int exceptionCounter = 0;
        int expectedExceptionCounter = hypervisorTypeArray.length - 4;

        for(int i = 0; i < hypervisorTypeArray.length; i++) {
            if (Hypervisor.HypervisorType.KVM == hypervisorTypeArray[i]
                    || Hypervisor.HypervisorType.XenServer == hypervisorTypeArray[i]
                    || Hypervisor.HypervisorType.VMware == hypervisorTypeArray[i]
                    || Hypervisor.HypervisorType.Simulator == hypervisorTypeArray[i]) {
                userVmManagerImpl.verifyIfHypervisorSupportsRootdiskSizeOverride(hypervisorTypeArray[i]);
            } else {
                try {
                    userVmManagerImpl.verifyIfHypervisorSupportsRootdiskSizeOverride(hypervisorTypeArray[i]);
                } catch (InvalidParameterValueException e) {
                    exceptionCounter ++;
                }
            }
        }

        Assert.assertEquals(expectedExceptionCounter, exceptionCounter);
    }

    @Test (expected = InvalidParameterValueException.class)
    public void prepareResizeVolumeCmdTestRootVolumeNull() {
        DiskOfferingVO newRootDiskOffering = Mockito.mock(DiskOfferingVO.class);
        DiskOfferingVO currentRootDiskOffering = Mockito.mock(DiskOfferingVO.class);
        userVmManagerImpl.prepareResizeVolumeCmd(null, currentRootDiskOffering, newRootDiskOffering);
    }

    @Test (expected = InvalidParameterValueException.class)
    public void prepareResizeVolumeCmdTestCurrentRootDiskOffering() {
        DiskOfferingVO newRootDiskOffering = Mockito.mock(DiskOfferingVO.class);
        VolumeVO rootVolumeOfVm = Mockito.mock(VolumeVO.class);
        userVmManagerImpl.prepareResizeVolumeCmd(rootVolumeOfVm, null, newRootDiskOffering);
    }

    @Test (expected = InvalidParameterValueException.class)
    public void prepareResizeVolumeCmdTestNewRootDiskOffering() {
        VolumeVO rootVolumeOfVm = Mockito.mock(VolumeVO.class);
        DiskOfferingVO currentRootDiskOffering = Mockito.mock(DiskOfferingVO.class);
        userVmManagerImpl.prepareResizeVolumeCmd(rootVolumeOfVm, currentRootDiskOffering, null);
    }

    @Test
    public void prepareResizeVolumeCmdTestNewOfferingLarger() {
        prepareAndRunResizeVolumeTest(2L, 10L, 20L, smallerDisdkOffering, largerDisdkOffering);
    }

    @Test
    public void prepareResizeVolumeCmdTestSameOfferingSize() {
        prepareAndRunResizeVolumeTest(null, 1L, 2L, smallerDisdkOffering, smallerDisdkOffering);
    }

    @Test
    public void prepareResizeVolumeCmdTestOfferingRootSizeZero() {
        DiskOfferingVO rootSizeZero = prepareDiskOffering(0l, 3l, 100L, 200L);
        prepareAndRunResizeVolumeTest(null, 100L, 200L, smallerDisdkOffering, rootSizeZero);
    }

    @Test (expected = InvalidParameterValueException.class)
    public void prepareResizeVolumeCmdTestNewOfferingSmaller() {
        prepareAndRunResizeVolumeTest(2L, 10L, 20L, largerDisdkOffering, smallerDisdkOffering);
    }

    private void prepareAndRunResizeVolumeTest(Long expectedOfferingId, long expectedMinIops, long expectedMaxIops, DiskOfferingVO currentRootDiskOffering, DiskOfferingVO newRootDiskOffering) {
        long rootVolumeId = 1l;
        VolumeVO rootVolumeOfVm = Mockito.mock(VolumeVO.class);
        Mockito.when(rootVolumeOfVm.getId()).thenReturn(rootVolumeId);

        ResizeVolumeCmd resizeVolumeCmd = userVmManagerImpl.prepareResizeVolumeCmd(rootVolumeOfVm, currentRootDiskOffering, newRootDiskOffering);

        Assert.assertEquals(rootVolumeId, resizeVolumeCmd.getId().longValue());
        Assert.assertEquals(expectedOfferingId, resizeVolumeCmd.getNewDiskOfferingId());
        Assert.assertEquals(expectedMinIops, resizeVolumeCmd.getMinIops().longValue());
        Assert.assertEquals(expectedMaxIops, resizeVolumeCmd.getMaxIops().longValue());
    }

    private DiskOfferingVO prepareDiskOffering(long rootSize, long diskOfferingId, long offeringMinIops, long offeringMaxIops) {
        DiskOfferingVO newRootDiskOffering = Mockito.mock(DiskOfferingVO.class);
        Mockito.when(newRootDiskOffering.getDiskSize()).thenReturn(rootSize);
        Mockito.when(newRootDiskOffering.getId()).thenReturn(diskOfferingId);
        Mockito.when(newRootDiskOffering.getMinIops()).thenReturn(offeringMinIops);
        Mockito.when(newRootDiskOffering.getMaxIops()).thenReturn(offeringMaxIops);
        Mockito.when(newRootDiskOffering.getName()).thenReturn("OfferingName");
        return newRootDiskOffering;
    }
}