Have run out of time tonight @bbonaby to finish review, but will try and get some more time on this tomorrow night.

Reviewed 1 of 13 files at r1, 4 of 11 files at r3, all commit messages.
Reviewable status: 5 of 13 files reviewed, 14 unresolved discussions (waiting on @bbonaby)

CHANGELOG.md line 8 at r3 (raw file):

## [Unreleased]

- Added DSC_VirtualHardDisk resource for creating virtual disks and tests. - Fixes [Issue #277](https://github.com/dsccommunity/StorageDsc/issues/277)

Can we add this to an ### Added section above and also remove the fullstop at the end of the description. E.g.

### Added

- Added DSC_VirtualHardDisk resource for creating virtual disks and tests - Fixes [Issue #277](https://github.com/dsccommunity/StorageDsc/issues/277)

source/DSCResources/DSC_Disk/DSC_Disk.psm1 line 283 at r3 (raw file):

    }

    if ($disk.PartitionStyle -eq 'RAW' -bor (-not $disk.PartitionStyle))

I noticed this was removed in the previous PR (DevDrive) - is this intentional?

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.schema.mof line 5 at r3 (raw file):

class DSC_VirtualHardDisk : OMI_BaseResource
{
    [Key, Description("Specifies the full path to the virtual hard disk file that will be created or attached. This must include the extension, and the extension must match the disk format.")] String FilePath;

"created or attached" - should this be "created and attached" ? E.g., is there a way this resource can create the vhd/x without attaching it?

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.schema.mof line 6 at r3 (raw file):

{
    [Key, Description("Specifies the full path to the virtual hard disk file that will be created or attached. This must include the extension, and the extension must match the disk format.")] String FilePath;
    [Write, Description("Specifies the size the of virtual hard disk.")] Uint64 DiskSize;

nit: Specifies the size the of virtual hard disk -> Specifies the size of virtual hard disk to create if it doesn't exist and Ensure is present.

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.schema.mof line 7 at r3 (raw file):

    [Key, Description("Specifies the full path to the virtual hard disk file that will be created or attached. This must include the extension, and the extension must match the disk format.")] String FilePath;
    [Write, Description("Specifies the size the of virtual hard disk.")] Uint64 DiskSize;
    [Write, Description("Specifies the disk type the virtual hard disk should use."), ValueMap{"Fixed","Dynamic"}, Values{"Fixed","Dynamic"}] String DiskType;

nit: Specifies the disk type the virtual hard disk should use. -> Specifies the disk type of virtual hard disk to create if it doesn't exist and Ensure is present.

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.schema.mof line 8 at r3 (raw file):

    [Write, Description("Specifies the size the of virtual hard disk.")] Uint64 DiskSize;
    [Write, Description("Specifies the disk type the virtual hard disk should use."), ValueMap{"Fixed","Dynamic"}, Values{"Fixed","Dynamic"}] String DiskType;
    [Write, Description("Specifies the disk format the virtual hard disk should use. Defaults to Vhdx."), ValueMap{"Vhd","Vhdx"}, Values{"Vhd","Vhdx"}] String DiskFormat;

nit: Specifies the disk format the virtual hard disk should use. Defaults to Vhdx. -> Specifies the disk format the virtual hard disk should use or create if it does not exist and Ensure is present. Defaults to Vhdx.

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.schema.mof line 9 at r3 (raw file):

    [Write, Description("Specifies the disk type the virtual hard disk should use."), ValueMap{"Fixed","Dynamic"}, Values{"Fixed","Dynamic"}] String DiskType;
    [Write, Description("Specifies the disk format the virtual hard disk should use. Defaults to Vhdx."), ValueMap{"Vhd","Vhdx"}, Values{"Vhd","Vhdx"}] String DiskFormat;
    [Write, Description("Determines whether the virtual hard disk should be created and attached or should not be attached."), ValueMap{"Present","Absent"}, Values{"Present","Absent"}] String Ensure;

nit: should not be attached -> should be detatched if it exists.

source/DSCResources/DSC_VirtualHardDisk/README.md line 7 at r3 (raw file):

There are 2 high level scenarios, one where the user uses the 'Present' flag and the second when the user uses the 'Absent' flag in the resource.

1. When the 'Present' flag is used the resource checks if the virtual hard disk is on the machine using the file path that is entered.

For md, use 1. for each item (regardless of the actual number or letter). This is because md renderers will auto number items. I think our automatic md testing will highlight this as well (but isn't because of the blank lines between entries 😀)

Can also remove blank lines between items.

source/DSCResources/DSC_VirtualHardDisk/README.md line 9 at r3 (raw file):

1. When the 'Present' flag is used the resource checks if the virtual hard disk is on the machine using the file path that is entered.

    a. If the file path is correct and it is confirmed to be the location of a real virtual hard disk file. The resource will do nothing.

Will the resource attach the virtual hard disk if it is not attached?

source/DSCResources/DSC_VirtualHardDisk/README.md line 11 at r3 (raw file):

    a. If the file path is correct and it is confirmed to be the location of a real virtual hard disk file. The resource will do nothing.

    b. If the location is a real virtual hard disk file but is not attached, the resource will attach the virtual hard disk to the system.

If the real vhd/vhdx exists but is not attached, but the size and/or disktype is different, what happens?

source/DSCResources/DSC_VirtualHardDisk/README.md line 28 at r3 (raw file):

## How does this differ from the [DSC_VHD](https://github.com/dsccommunity/HyperVDsc/tree/main/source/DSCResources/DSC_VHD) in the Hyper-V Dsc?

This DSC_VirtualHardDisk resource does not rely on the Hyper-V Windows feature being enabled to allow users to use the resource. Unlike the DSC_VHD, users can use this resource right out of the box assuming they are running at least `Windows 8.1 / Windows Server 2008 R2 or later`. The resource uses the publicly available Win32 virtual disk apis, to create and attach a virtual hard disk file (`.vhd` and `.vhdx`) to the system. See more information about the apis [here](https://learn.microsoft.com/en-us/windows/win32/api/virtdisk/).

Can we add a warning here that using both DSC_VirtualHardDisk and DSC_VHD in the same config/machine could result in an invalid config (not that anyone would... but we never know 😀 )

source/DSCResources/DSC_VirtualHardDisk/README.md line 32 at r3 (raw file):

## Limitations

1. The resource only supports .vhd and .vhdx files. No other virtual hard disk file extension is supported at this time.

nit: wrap .vhd and .vhdx in backtick to highlight as code (even though not really code :D)

source/DSCResources/DSC_VirtualHardDisk/README.md line 33 at r3 (raw file):

1. The resource only supports .vhd and .vhdx files. No other virtual hard disk file extension is supported at this time.
2. The ability to `expand` the max size of the virtual hard disk after its creation is not currently included in this resource.

See comments about markdown autonumbering above. Can also use the VS Markdown linting extension to automatically get this suggestion.

source/Modules/VirtualHardDisk.Win32Helpers/VirtualHardDisk.Win32Helpers.psm1 line 0 at r3 (raw file):
To help associate any imported modules with the DSC resource, can we name this as StorageDsc.VirtualHardDisk.Win32Helpers - or something to that effect?

Reviewable status: 0 of 15 files reviewed, 14 unresolved discussions (waiting on @PlagueHO)

CHANGELOG.md line 8 at r3 (raw file):

Thanks, updated.

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.schema.mof line 6 at r3 (raw file):

thanks updated

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.schema.mof line 7 at r3 (raw file):

thanks updated

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.schema.mof line 8 at r3 (raw file):

thanks updated

source/DSCResources/DSC_VirtualHardDisk/README.md line 7 at r3 (raw file):

updated, thanks

Apologies @bbonaby - been so snowed under the last couple of weeks this slipped off my radar. Will do this tonight.

Reviewable status: 0 of 15 files reviewed, 14 unresolved discussions

Reviewed 3 of 11 files at r3, 3 of 10 files at r5, 1 of 1 files at r6, 1 of 1 files at r8, all commit messages.
Reviewable status: 8 of 15 files reviewed, 2 unresolved discussions

Hi @bbonaby - sorry about the delay. I've finished reviewing all the files now - nothing major just some style bits and pieces.

One question: how easy/would it be possible to add integration tests for this resource?

Reviewed 1 of 11 files at r3, 7 of 10 files at r5.
Reviewable status: all files reviewed, 43 unresolved discussions (waiting on @bbonaby)

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 33 at r8 (raw file):

        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [String]

nit: avoid type accelerators.

Suggestion:

[System.String]

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 43 at r8 (raw file):

    $diskImage = Get-DiskImage -ImagePath $FilePath -ErrorAction SilentlyContinue
    $Ensure = 'Present'

nit: lower case for local vars.

Suggestion:

$ensure = 'Present'

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 47 at r8 (raw file):

    if (-not $diskImage)
    {
        $Ensure = 'Absent'

nit: lower case for local vars.

Suggestion:

$ensure = 'Absent'

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 56 at r8 (raw file):

        Size       = $diskImage.Size
        DiskNumber = $diskImage.DiskNumber
        Ensure     = $Ensure

nit: lower case for local vars.

Suggestion:

Ensure     = $ensure

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 86 at r8 (raw file):

        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [String]

nit: avoid type accelerators.

Suggestion:

[System.String]

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 112 at r8 (raw file):

    Assert-ParametersValid -FilePath $FilePath -DiskSize $DiskSize -DiskFormat $DiskFormat

    $resource = Get-TargetResource -FilePath $FilePath

nit: Maybe rename variable to $currentState to indicate that this is the current state of the virtual disk? Also aligns to style in other resources.

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 144 at r8 (raw file):

                {
                    Write-Verbose -Message ($script:localizedData.RemovingCreatedVirtualHardDiskFile -f $FilePath)
                    Remove-Item $FilePath -verbose

Should we attempt with -Force and -Confirm:No?

Also capital V in verbose.

Suggestion:

Remove-Item $FilePath -Verbose

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 149 at r8 (raw file):

                if ($wasLocationCreated)
                {
                    Remove-Item -LiteralPath $folderPath -verbose

Should we attempt with -Force and -Confirm:No?

Also capital V in verbose.

Suggestion:

Remove-Item -LiteralPath $folderPath -Verbose

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 170 at r8 (raw file):

    else
    {
        # Detach the virtual hard disk if its not suppose to be attached.

nit: comment correction.

Suggestion:

# Detach the virtual hard disk if its not supposed to be attached.

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 211 at r8 (raw file):

        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [String]

nit: avoid type accelerators.

Suggestion:

[System.String]

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 237 at r8 (raw file):

    Assert-ParametersValid -FilePath $FilePath -DiskSize $DiskSize -DiskFormat $DiskFormat

    $resource = Get-TargetResource -FilePath $FilePath

nit: Maybe rename variable to $currentState to indicate that this is the current state of the virtual disk? Also aligns to style in other resources.

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 306 at r8 (raw file):

        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [String]

nit: avoid using type accelerators.

Suggestion:

[System.String]

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 311 at r8 (raw file):

        [Parameter(Mandatory = $true)]
        [System.UInt64]
        $DiskSize,

Should there also be a validate $DiskSize is greater than zero? [ValidateScript({$ -gt 0})]- although I can see that this would be detected lower down anyway.

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 359 at r8 (raw file):

    $isInValidSizeForVhdxFormat = ($DiskSize -lt 10MB -bor $DiskSize -gt 64TB)
    if ((-not $isVhdxFormat -and $isInValidSizeForVhdFormat) -bor
        ($IsVhdxFormat -and $isInValidSizeForVhdxFormat))

nit: lower case

Suggestion:

($isVhdxFormat -and $isInValidSizeForVhdxFormat))

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 363 at r8 (raw file):

        if ($DiskSize -lt 1GB)
        {
            $DiskSizeString =  ($DiskSize / 1MB).ToString("0.00MB")

nit: style tweaks.

Suggestion:

$diskSizeString = ($DiskSize / 1MB).ToString('0.00MB')

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 367 at r8 (raw file):

        else
        {
            $DiskSizeString =  ($DiskSize / 1TB).ToString("0.00TB")

nit: style tweaks.

Suggestion:

$diskSizeString = ($DiskSize / 1TB).ToString('0.00TB')

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 370 at r8 (raw file):

        }

        $InvalidSizeMsg = $script:localizedData.VhdFormatDiskSizeInvalid

nit: lower case local vars.

Suggestion:

$invalidSizeMsg = $script:localizedData.VhdFormatDiskSizeInvalid

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 373 at r8 (raw file):

        if ($isVhdxFormat)
        {
            $InvalidSizeMsg = $script:localizedData.VhdxFormatDiskSizeInvalid

nit: lower case local vars.

Suggestion:

$invalidSizeMsg = $script:localizedData.VhdxFormatDiskSizeInvalid

source/DSCResources/DSC_VirtualHardDisk/DSC_VirtualHardDisk.psm1 line 377 at r8 (raw file):

        New-InvalidArgumentException `
            -Message $($InvalidSizeMsg -f $DiskSizeString) `

nit: lower case local vars.

Suggestion:

-Message $($invalidSizeMsg -f $DiskSizeString) `

source/DSCResources/DSC_VirtualHardDisk/README.md line 61 at r8 (raw file):

1. The resource only supports `.vhd` and `.vhdx` files. No other virtual hard disk
file extension is supported at this time.
1. The ability to `expand` the max size of the virtual hard disk after its creation

It looks like this line isn't complete. Presume it should end with 'is not currently included in this resource.'

tests/Unit/DSC_VirtualHardDisk.Tests.ps1 line 168 at r8 (raw file):

            }

            Context 'When file path does exist and was mounted at one point' {

This test looks like it verifies that the file exists and it is currently mounted? Should this reflect that it is currently mounted?

tests/Unit/DSC_VirtualHardDisk.Tests.ps1 line 199 at r8 (raw file):

        Describe 'DSC_VirtualHardDisk\Set-TargetResource' {

nit: Can remove blank line here

tests/Unit/DSC_VirtualHardDisk.Tests.ps1 line 201 at r8 (raw file):

            Context 'When file path is not fully qualified' {

nit: Can remove blank line here

tests/Unit/DSC_VirtualHardDisk.Tests.ps1 line 276 at r8 (raw file):

            Context 'When size provided is less than the minimum size for the vhd format' {

Can remove blank line.

tests/Unit/DSC_VirtualHardDisk.Tests.ps1 line 277 at r8 (raw file):

            Context 'When size provided is less than the minimum size for the vhd format' {

                $minSizeInMbString = ($DiskImageSizeBelowVirtDiskMinimum / 1MB).ToString("0.00MB")

nit: single quotes can be used here.

Suggestion:

$minSizeInMbString = ($DiskImageSizeBelowVirtDiskMinimum / 1MB).ToString('0.00MB')

tests/Unit/DSC_VirtualHardDisk.Tests.ps1 line 296 at r8 (raw file):

            Context 'When size provided is less than the minimum size for the vhdx format' {
                $minSizeInMbString = ($DiskImageSizeBelowVirtDiskMinimum / 1MB).ToString("0.00MB")

nit: single quotes can be used here.

Suggestion:

$minSizeInMbString = ($DiskImageSizeBelowVirtDiskMinimum / 1MB).ToString('0.00MB')

tests/Unit/DSC_VirtualHardDisk.Tests.ps1 line 315 at r8 (raw file):

            Context 'When size provided is greater than the maximum size for the vhd format' {
                $maxSizeInTbString = ($DiskImageSizeAboveVhdMaximum / 1TB).ToString("0.00TB")

nit: single quotes can be used here.

Suggestion:

$maxSizeInTbString = ($DiskImageSizeAboveVhdMaximum / 1TB).ToString('0.00TB')

tests/Unit/DSC_VirtualHardDisk.Tests.ps1 line 334 at r8 (raw file):

            Context 'When size provided is greater than the maximum size for the vhdx format' {
                $maxSizeInTbString = ($DiskImageSizeAboveVhdxMaximum / 1TB).ToString("0.00TB")

nit: single quotes can be used here.

Suggestion:

$maxSizeInTbString = ($DiskImageSizeAboveVhdxMaximum / 1TB).ToString('0.00TB')

tests/Unit/DSC_VirtualHardDisk.Tests.ps1 line 462 at r8 (raw file):

            }

            Context 'Virtual disk does not exist and ensure set to present, so a new one should be created.' {

No need for full stop and could specify that it will be mounted.

Suggestion:

Context 'Virtual disk does not exist and ensure set to present, so a new one should be created and mounted' {

tests/Unit/DSC_VirtualHardDisk.Tests.ps1 line 492 at r8 (raw file):

            Context 'When folder does not exist in user provided path but an exception occurs after creating the virtual disk' {

Can remove blank line.

tests/Unit/DSC_VirtualHardDisk.Tests.ps1 line 585 at r8 (raw file):

                        -DiskFormat $extension `
                        -Ensure 'Present' `
                        -Verbose | Should -Be $false

Can use -BeFalse and -BeTrue throughout.

Suggestion:

-Verbose | Should -BeFalse

source/Modules/StorageDsc.VirtualHardDisk.Win32Helpers/StorageDsc.VirtualHardDisk.Win32Helpers.psm1 line 309 at r8 (raw file):

<#
    .SYNOPSIS
        Calls Win32 OpenVirtualDisk api. This is used so we can mock this call

Maybe move this to the .DESCRIPTION and use the .SYNOPSIS to define the actual function? E.g., something like "Open an existing virtual disk"?

What happens if the VHD/VHDX doesn't exist?

source/Modules/StorageDsc.VirtualHardDisk.Win32Helpers/StorageDsc.VirtualHardDisk.Win32Helpers.psm1 line 395 at r8 (raw file):

        [Parameter(Mandatory = $true)]
        [System.String]
        $VirtualDiskPath,

Could add a [Validate()] here to verify the file does not exist (as I presume it should not)?

source/Modules/StorageDsc.VirtualHardDisk.Win32Helpers/StorageDsc.VirtualHardDisk.Win32Helpers.psm1 line 417 at r8 (raw file):

    # Get parameters for CreateVirtualDisk function
    [ref]$virtualStorageType = Get-VirtualStorageType -DiskFormat $DiskFormat
    [ref]$createVirtualDiskParameters = New-Object VirtDisk.Helper+CREATE_VIRTUAL_DISK_PARAMETERS

nit: Use parameter names

Suggestion:

[ref]$createVirtualDiskParameters = New-Object -TypeName VirtDisk.Helper+CREATE_VIRTUAL_DISK_PARAMETERS

source/Modules/StorageDsc.VirtualHardDisk.Win32Helpers/StorageDsc.VirtualHardDisk.Win32Helpers.psm1 line 440 at r8 (raw file):

        $result = New-VirtualDiskUsingWin32 `
            -VirtualStorageType $virtualStorageType `
            -VirtualDiskPath $VirtualDiskPath `

What happens if the disk (or a file in this location) already exists? Do we just catch and throw?

source/Modules/StorageDsc.VirtualHardDisk.Win32Helpers/StorageDsc.VirtualHardDisk.Win32Helpers.psm1 line 493 at r8 (raw file):

    (
        [Parameter(Mandatory = $true)]
        [System.String]

Could add a [Validate()] here to verify the file exists (as I presume it should)?

source/Modules/StorageDsc.VirtualHardDisk.Win32Helpers/StorageDsc.VirtualHardDisk.Win32Helpers.psm1 line 518 at r8 (raw file):

        # Build parameters for AttachVirtualDisk function.
        [ref]$attachVirtualDiskParameters = New-Object VirtDisk.Helper+ATTACH_VIRTUAL_DISK_PARAMETERS

nit: Use parameter names

Suggestion:

[ref]$attachVirtualDiskParameters = New-Object -TypeName VirtDisk.Helper+ATTACH_VIRTUAL_DISK_PARAMETERS

source/Modules/StorageDsc.VirtualHardDisk.Win32Helpers/StorageDsc.VirtualHardDisk.Win32Helpers.psm1 line 529 at r8 (raw file):

            virtual disk to be attached by the system at boot time.
        #>
        for ($attempts = 0; $attempts -lt 2; $attempts++)

Another way of doing this could be to use something like (which might be slightly cleaner... but not much :grinnng:):

$attemptFlagValues = @(
    [VirtDisk.Helper]::ATTACH_VIRTUAL_DISK_FLAG_PERMANENT_LIFETIME -bor [VirtDisk.Helper]::ATTACH_VIRTUAL_DISK_FLAG_AT_BOOT,
    [VirtDisk.Helper]::ATTACH_VIRTUAL_DISK_FLAG_PERMANENT_LIFETIME
)
foreach ($flags in $attemptFlagValues)
{
            $result = Add-VirtualDiskUsingWin32 `
                -Handle $Handle `
                -SecurityDescriptor $securityDescriptor `
                -Flags $flags `
                -ProviderSpecificFlags $providerSpecificFlags `
                -AttachVirtualDiskParameters $attachVirtualDiskParameters `
                -Overlapped ([System.IntPtr]::Zero)

            if ($result -eq 0)
            {
                break
            }
}

source/Modules/StorageDsc.VirtualHardDisk.Win32Helpers/StorageDsc.VirtualHardDisk.Win32Helpers.psm1 line 593 at r8 (raw file):

        [Parameter(Mandatory = $true)]
        [System.String]
        $VirtualDiskPath,

Could add a [Validate()] here to verify the file exists (as I presume it should)?

source/Modules/StorageDsc.VirtualHardDisk.Win32Helpers/StorageDsc.VirtualHardDisk.Win32Helpers.psm1 line 606 at r8 (raw file):

    # Get parameters for OpenVirtualDisk function.
    [ref]$virtualStorageType =  Get-VirtualStorageType -DiskFormat $DiskFormat
    [ref]$openVirtualDiskParameters = New-Object VirtDisk.Helper+OPEN_VIRTUAL_DISK_PARAMETERS

nit: Add parameter name

Suggestion:

[ref]$openVirtualDiskParameters = New-Object -TypeName VirtDisk.Helper+OPEN_VIRTUAL_DISK_PARAMETERS

tests/Unit/StorageDsc.VirtualHardDisk.Win32Helpers.Tests.ps1 line 29 at r8 (raw file):

# Begin Testing
InModuleScope $script:subModuleName {
    Function New-VirtualDiskUsingWin32

nit: lower case f for function

Suggestion:

function New-VirtualDiskUsingWin32

tests/Unit/StorageDsc.VirtualHardDisk.Win32Helpers.Tests.ps1 line 73 at r8 (raw file):

    }

    Function Add-VirtualDiskUsingWin32

nit: lower case f for function

Suggestion:

function Add-VirtualDiskUsingWin32

tests/Unit/StorageDsc.VirtualHardDisk.Win32Helpers.Tests.ps1 line 105 at r8 (raw file):

    }

    Function Get-VirtualDiskUsingWin32

nit: lower case f for function

Suggestion:

function Get-VirtualDiskUsingWin32