Bulk rename a test assembly, class, and/or namespace referenced by test case automation

Rename-TestCaseAutomation.ps1

#requires -version 3.0
function Rename-TestCaseAutomation {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory, Position=0)]
        [string]
        $CollectionUri,    

        [Parameter(Mandatory, Position=1)]
        [string[]]
        $TeamProject,
    
        [Parameter(ParameterSetName='RenameTestStorage', Mandatory)]
        [Parameter(ParameterSetName='RenameTestName')]
        [Parameter(ParameterSetName='RenameTestBoth')]
        [string]
        $TestStorage,

        [Parameter(ParameterSetName='RenameTestStorage')]
        [Parameter(ParameterSetName='RenameTestName', Mandatory)]
        [Parameter(ParameterSetName='RenameTestBoth', Mandatory)]
        [string]
        $TestNamePrefix,

        [Parameter(ParameterSetName='RenameTestStorage', Mandatory)]
        [Parameter(ParameterSetName='RenameTestBoth', Mandatory)]
        [string]
        $NewTestStorage,

        [Parameter(ParameterSetName='RenameTestName', Mandatory)]
        [Parameter(ParameterSetName='RenameTestBoth', Mandatory)]
        [string]
        $NewTestNamePrefix

    )

    #Set-StrictMode -Version Latest

    Add-Type -AssemblyName 'Microsoft.TeamFoundation.Client, Version=11.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
    Add-Type -AssemblyName 'Microsoft.TeamFoundation.TestManagement.Client, Version=11.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'

    $Collection = [Microsoft.TeamFoundation.Client.TfsTeamProjectCollectionFactory]::GetTeamProjectCollection($CollectionUri)
    $TestManagement = $Collection.GetService('Microsoft.TeamFoundation.TestManagement.Client.ITestManagementService')

    $TestCaseQuery = 'select * from WorkItem '
    if ($TestStorage -and $TestNamePrefix) {
        $TestCaseQuery += 'where Microsoft.VSTS.TCM.AutomatedTestStorage = @TestStorage and Microsoft.VSTS.TCM.AutomatedTestName contains @TestNamePrefix'
    } elseif ($TestStorage) {
        $TestCaseQuery += 'where Microsoft.VSTS.TCM.AutomatedTestStorage = @TestStorage'
    } else {
        $TestCaseQuery += 'where Microsoft.VSTS.TCM.AutomatedTestName contains @TestNamePrefix'
    }

    $Provider = New-Object -TypeName System.Security.Cryptography.SHA1CryptoServiceProvider

    $TeamProject |
        ForEach-Object {
            $TestProject = $TestManagement.GetTeamProject($_)
            $TestProject.TestCases.Query($TestCaseQuery, @{ TestStorage = $TestStorage ; TestNamePrefix = $TestNamePrefix })
        } |
        ForEach-Object {
            $Case = $_
            $Impl = $Case.Implementation

            if (-not $TestNamePrefix -or $Impl.TestName -like "$TestNamePrefix*") {

                $TestName = $Impl.TestName
                if ($NewTestNamePrefix) {
                    $TestName = $NewTestNamePrefix + $Impl.TestName.Substring($TestNamePrefix.Length)
                }

                $Storage = $Impl.Storage
                if ($NewTestStorage) {
                    $Storage = $NewTestStorage
                }

                $NewTestId = $Impl.TestId
                if ($TestName -cne $Impl.TestName) {
                    # TestId regenerated to support tcm.exe testcase /import. Implementation from:
                    # http://blogs.msdn.com/b/gautamg/archive/2012/01/01/how-to-associate-automation-programmatically.aspx
                    $UnicodeBytes = [System.Text.Encoding]::Unicode.GetBytes($TestName)
                    $HashBytes = [byte[]]$Provider.ComputeHash($UnicodeBytes)[0..15]
                    $NewTestId = New-Object -TypeName System.Guid -ArgumentList (,$HashBytes)
                }

                $NewImpl = $Case.Project.CreateTmiTestImplementation( $TestName, $Impl.TestType, $Storage, $NewTestId )
        
                $Case.WorkItem.Open()
                $Case.Implementation = $NewImpl
                $Case.Save()

                $Case

            }

        } | 
        Select-Object -Property Id, Title,
            @{n='TestName';e={$_.Implementation.TestName}},
            @{n='Storage';e={$_.Implementation.Storage}}


}