Tests/TestHelpers/CommonTestHelper.psm1
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[Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingConvertToSecureStringWithPlainText', '')] param () $errorActionPreference = 'Stop' Set-StrictMode -Version 'Latest' <# Cache the AppVeyor Administrator credential so that we do not reset the password multiple times if retrieved the credential is requested multiple times. #> $script:appVeyorAdministratorCredential = $null <# This is the name of the magic file that will be written to the .git folder in DSCResource.Tests to determine the last time it was updated. #> $script:dscResourceTestsMagicFile = 'DSC_LAST_FETCH' <# This is the number of minutes after which the DSCResource.Tests will be updated. #> $script:dscResourceTestsRefreshAfterMinutes = 120 <# String data for unit test names to be used with the generic test functions. Maps command names to the appropriate test names to insert when checking that the correct mocks are called. In the future we will move this data out of the commonTestHelper file and into the corresponding test file or its own file. For now, it is much easier to access this way rather than passing it around. #> data testStrings { ConvertFrom-StringData -StringData @' Assert-FileHashValid = assert that the file hash is valid Assert-FileSignatureValid = assert that the file signature is valid Assert-FileValid = assert that the file is valid Assert-PathExtensionValid = assert that the specified path extension is valid Close-Stream = close the stream Convert-PathToUri = convert the path to a URI Convert-ProductIdToIdentifyingNumber = convert the product ID to the identifying number Copy-ResponseStreamToFileStream = copy the response to the outstream Get-ItemProperty = retrieve {0} Get-MsiProductCode = retrieve the MSI product code Get-ProductEntry = retrieve the product entry Get-ProductEntryInfo = retrieve the product entry info Get-ProductEntryValue = retrieve the value of the product entry property Get-ScriptBlock = retrieve the script block Get-WebRequest = retrieve the WebRequest object Get-WebRequestResponse = retrieve the web request response Get-WebRequestResponseStream = retrieve the WebRequest response stream Invoke-CimMethod = attempt to invoke a cim method to check if reboot is required Invoke-PInvoke = attempt to {0} the MSI package under the user Invoke-Process = attempt to {0} the MSI package under the process New-Item = create a new {0} New-LogFile = create a new log file New-Object = create a new {0} New-PSDrive = create a new PS Drive Remove-Item = remove {0} Remove-PSDrive = remove the PS drive Start-MsiProcess = start the MSI process Test-Path = test that the path {0} exists '@ } <# .SYNOPSIS Retrieves the name of the test for asserting that the given function is called. .PARAMETER IsCalled Indicates whether the function should be called or not. .PARAMETER Custom An optional string to include in the test name to make the name more descriptive. Can only be used by commands that have a variable in their string data name. #> function Get-TestName { [OutputType([System.String])] [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.String] $Command, [Parameter()] [System.Boolean] $IsCalled = $true, [Parameter()] [System.String] $Custom = '' ) $testName = '' if (-not [System.String]::IsNullOrEmpty($Custom)) { $testName = ($testStrings.$Command -f $Custom) } else { $testName = $testStrings.$Command } if ($IsCalled) { return 'Should ' + $testName } else { return 'Should not ' + $testName } } <# .SYNOPSIS Tests that each mock in MocksCalled is called the expected number of times. .PARAMETER MocksCalled An array of the mocked commands that should be called or not called. Each item in the array is a hashtable that contains the name of the command being mocked and the number of times it is called (can be 0). #> function Invoke-ExpectedMocksAreCalledTest { [CmdletBinding()] param ( [Parameter()] [System.Collections.Hashtable[]] $MocksCalled ) foreach ($mock in $MocksCalled) { $testName = Get-TestName -Command $mock.Command -IsCalled $mock.Times if ($mock.Keys -contains 'Custom') { $testName = Get-TestName -Command $mock.Command -IsCalled $mock.Times -Custom $mock.Custom } It $testName { Assert-MockCalled -CommandName $mock.Command -Exactly $mock.Times -Scope 'Context' } } } <# .SYNOPSIS Performs generic tests for the given function, including checking that the function does not throw and checking that all mocks are called the expected number of times. .PARAMETER Function The function to be called. Must be in format: { Param($hashTableOfParamsToPass) Function-Name @hashTableOfParamsToPass } For example: { Param($testLogPath) New-LogFile $script:testPath } or { Param($startMsiProcessParameters) Start-MsiProcess @startMsiProcessParameters } .PARAMETER FunctionParameters The parameters that should be passed to the function for this test. Should match what is passed in the Function parameter. .PARAMETER MocksCalled An array of the mocked commands that should be called for this test. Each item in the array is a hashtable that contains the name of the command being mocked, the number of times it is called (can be 0) and, optionally, an extra custom string to make the test name more descriptive. The custom string will only work if the command has a corresponding variable in the string data name. .PARAMETER ShouldThrow Indicates whether the function should throw or not. If this is set to True then ErrorMessage and ErrorTestName should also be passed. .PARAMETER ErrorMessage The error message that should be thrown if the function is supposed to throw. .PARAMETER ErrorTestName The string that should be used to create the name of the test that checks for the correct error being thrown. #> function Invoke-GenericUnitTest { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.Management.Automation.ScriptBlock] $Function, [Parameter(Mandatory = $true)] [System.Collections.Hashtable] $FunctionParameters, [Parameter()] [System.Collections.Hashtable[]] $MocksCalled, [Parameter()] [System.Boolean] $ShouldThrow = $false, [Parameter()] [System.String] $ErrorMessage = '', [Parameter()] [System.String] $ErrorTestName = '' ) if ($ShouldThrow) { It "Should throw an error for $ErrorTestName" { { $null = $($Function.Invoke($FunctionParameters)) } | Should -Throw -ExpectedMessage $ErrorMessage } } else { It 'Should not throw' { { $null = $($Function.Invoke($FunctionParameters)) } | Should -Not -Throw } } Invoke-ExpectedMocksAreCalledTest -MocksCalled $MocksCalled } <# .SYNOPSIS Performs generic tests for Get-TargetResource, including checking that the function does not throw, checking that all mocks are called the expected number of times, and checking that the correct result is returned. If the function is expected to throw, then this function should not be used. .PARAMETER GetTargetResourceParameters The parameters that should be passed to Get-TargetResource for this test. .PARAMETER MocksCalled An array of the mocked commands that should be called for this test. Each item in the array is a hashtable that contains the name of the command being mocked, the number of times it is called (can be 0) and, optionally, an extra custom string to make the test name more descriptive. The custom string will only work if the command has a corresponding variable in the string data name. .PARAMETER ExpectedReturnValue The expected hashtable that Get-TargetResource should return for this test. #> function Invoke-GetTargetResourceUnitTest { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.Collections.Hashtable] $GetTargetResourceParameters, [Parameter()] [System.Collections.Hashtable[]] $MocksCalled, [Parameter(Mandatory = $true)] [System.Collections.Hashtable] $ExpectedReturnValue ) It 'Should not throw' { { $null = Get-TargetResource @GetTargetResourceParameters } | Should -Not -Throw } Invoke-ExpectedMocksAreCalledTest -MocksCalled $MocksCalled $getTargetResourceResult = Get-TargetResource @GetTargetResourceParameters It 'Should return a Hashtable' { $getTargetResourceResult -is [System.Collections.Hashtable] | Should -BeTrue } It "Should return a Hashtable with $($ExpectedReturnValue.Keys.Count) properties" { $getTargetResourceResult.Keys.Count | Should -Be $ExpectedReturnValue.Keys.Count } foreach ($key in $ExpectedReturnValue.Keys) { It "Should return a Hashtable with the $key property as $($ExpectedReturnValue.$key)" { $getTargetResourceResult.$key | Should -Be $ExpectedReturnValue.$key } } } <# .SYNOPSIS Performs generic tests for Set-TargetResource, including checking that the function does not throw and checking that all mocks are called the expected number of times. .PARAMETER SetTargetResourceParameters The parameters that should be passed to Set-TargetResource for this test. .PARAMETER MocksCalled An array of the mocked commands that should be called for this test. Each item in the array is a hashtable that contains the name of the command being mocked, the number of times it is called (can be 0) and, optionally, an extra custom string to make the test name more descriptive. The custom string will only work if the command has a corresponding variable in the string data name. .PARAMETER ShouldThrow Indicates whether Set-TargetResource should throw or not. If this is set to True then ErrorMessage and ErrorTestName should also be passed. .PARAMETER ErrorMessage The error message that should be thrown if Set-TargetResource is supposed to throw. .PARAMETER ErrorTestName The string that should be used to create the name of the test that checks for the correct error being thrown. #> function Invoke-SetTargetResourceUnitTest { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.Collections.Hashtable] $SetTargetResourceParameters, [Parameter()] [System.Collections.Hashtable[]] $MocksCalled, [Parameter()] [System.Boolean] $ShouldThrow = $false, [Parameter()] [System.String] $ErrorMessage = '', [Parameter()] [System.String] $ErrorTestName = '' ) if ($ShouldThrow) { It "Should throw an error for $ErrorTestName" { { $null = Set-TargetResource @SetTargetResourceParameters } | Should -Throw -ExpectedMessage $ErrorMessage } } else { It 'Should not throw' { { $null = Set-TargetResource @SetTargetResourceParameters } | Should -Not -Throw } } Invoke-ExpectedMocksAreCalledTest -MocksCalled $MocksCalled } <# .SYNOPSIS Performs generic tests for Test-TargetResource, including checking that the function does not throw, checking that all mocks are called the expected number of times, and checking that the correct result is returned. If the function is expected to throw, then this function should not be used. .PARAMETER TestTargetResourceParameters The parameters that should be passed to Test-TargetResource for this test. .PARAMETER MocksCalled An array of the mocked commands that should be called for this test. Each item in the array is a hashtable that contains the name of the command being mocked, the number of times it is called (can be 0) and, optionally, an extra custom string to make the test name more descriptive. The custom string will only work if the command has a corresponding variable in the string data name. .PARAMETER ExpectedReturnValue The expected boolean value that should be returned #> function Invoke-TestTargetResourceUnitTest { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.Collections.Hashtable] $TestTargetResourceParameters, [Parameter()] [System.Collections.Hashtable[]] $MocksCalled, [Parameter(Mandatory = $true)] [System.Boolean] $ExpectedReturnValue ) It 'Should not throw' { { $null = Test-TargetResource @TestTargetResourceParameters } | Should -Not -Throw } Invoke-ExpectedMocksAreCalledTest -MocksCalled $MocksCalled $testTargetResourceResult = Test-TargetResource @TestTargetResourceParameters It "Should return $ExpectedReturnValue" { $testTargetResourceResult | Should -Be $ExpectedReturnValue } } <# .SYNOPSIS Tests that the Get-TargetResource method of a DSC Resource is not null, can be converted to a hashtable, and has the correct properties. Uses Pester. .PARAMETER GetTargetResourceResult The result of the Get-TargetResource method. .PARAMETER GetTargetResourceResultProperties The properties that the result of Get-TargetResource should have. #> function Test-GetTargetResourceResult { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateNotNull()] [System.Collections.Hashtable] $GetTargetResourceResult, [Parameter()] [System.String[]] $GetTargetResourceResultProperties ) foreach ($property in $GetTargetResourceResultProperties) { $GetTargetResourceResult[$property] | Should -Not -Be $null } } <# .SYNOPSIS Tests if a scope represents the current machine. .PARAMETER Scope The scope to test. #> function Test-IsLocalMachine { [OutputType([System.Boolean])] [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $Scope ) if ($scope -eq '.') { return $true } if ($scope -eq $env:COMPUTERNAME) { return $true } if ($scope -eq 'localhost') { return $true } if ($scope.Contains('.')) { if ($scope -eq '127.0.0.1') { return $true } <# Determine if we have an ip address that matches an ip address on one of the network adapters. NOTE: This is likely overkill; consider removing it. #> $networkAdapters = @(Get-CimInstance Win32_NetworkAdapterConfiguration) foreach ($networkAdapter in $networkAdapters) { if ($null -ne $networkAdapter.IPAddress) { foreach ($address in $networkAdapter.IPAddress) { if ($address -eq $scope) { return $true } } } } } return $false } <# .SYNOPSIS Waits a certain amount of time for a script block to return true. Return $true if completed successfully in the given amount of time, $false otherwise. .PARAMETER ScriptBlock The ScriptBlock to wait for. .PARAMETER TimeoutSeconds The number of seconds to wait for the ScriptBlock to return $true. Default value is 5. #> function Wait-ScriptBlockReturnTrue { [OutputType([System.Boolean])] [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.Management.Automation.ScriptBlock] $ScriptBlock, [Parameter()] [System.Int32] $TimeoutSeconds = 5 ) $startTime = [System.DateTime]::Now $invokeScriptBlockResult = $false while (-not $invokeScriptBlockResult -and (([System.DateTime]::Now - $startTime).TotalSeconds -lt $TimeoutSeconds)) { $invokeScriptBlockResult = $ScriptBlock.Invoke() Start-Sleep -Seconds 1 } return $invokeScriptBlockResult } <# .SYNOPSIS Tests if a file is currently locked. .PARAMETER Path The path to the file to test. #> function Test-IsFileLocked { [OutputType([System.Boolean])] [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.String] $Path ) if (-not (Test-Path $Path)) { return $false } try { Get-Content -Path $Path | Out-Null return $false } catch { return $true } } <# .SYNOPSIS Tests that calling the Set-TargetResource cmdlet with the WhatIf parameter specified produces output that contains all the given expected output. Uses Pester. .PARAMETER Parameters The parameters to pass to Set-TargetResource. These parameters do not need to contain the WhatIf parameter, but if they do, this function will run Set-TargetResource with WhatIf = $true no matter what is in the Parameters Hashtable. .PARAMETER ExpectedOutput The output expected to be in the output from running WhatIf with the Set-TargetResource cmdlet. If this parameter is empty or null, this cmdlet will check that there was no output from Set-TargetResource with WhatIf specified. #> function Test-SetTargetResourceWithWhatIf { [OutputType([System.Boolean])] [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.Collections.Hashtable] $Parameters, [Parameter()] [System.String[]] $ExpectedOutput ) $transcriptPath = Join-Path -Path (Get-Location) -ChildPath 'WhatIfTestTranscript.txt' if (Test-Path -Path $transcriptPath) { Wait-ScriptBlockReturnTrue -ScriptBlock {-not (Test-IsFileLocked -Path $transcriptPath)} -TimeoutSeconds 10 Remove-Item -Path $transcriptPath -Force } $Parameters['WhatIf'] = $true try { Wait-ScriptBlockReturnTrue -ScriptBlock {-not (Test-IsFileLocked -Path $transcriptPath)} Start-Transcript -Path $transcriptPath Set-TargetResource @Parameters Stop-Transcript Wait-ScriptBlockReturnTrue -ScriptBlock {-not (Test-IsFileLocked -Path $transcriptPath)} $transcriptContent = Get-Content -Path $transcriptPath -Raw $transcriptContent | Should -Not -Be $null $regexString = '\*+[^\*]*\*+' # Removing transcript diagnostic logging at top and bottom of file $selectedString = Select-String -InputObject $transcriptContent ` -Pattern $regexString ` -AllMatches foreach ($match in $selectedString.Matches) { $transcriptContent = $transcriptContent.Replace($match.Captures, '') } $transcriptContent = $transcriptContent.Replace("`r`n", '').Replace("`n", '') if ($null -eq $ExpectedOutput -or $ExpectedOutput.Count -eq 0) { [System.String]::IsNullOrEmpty($transcriptContent) | Should -BeTrue } else { foreach ($expectedOutputPiece in $ExpectedOutput) { $transcriptContent.Contains($expectedOutputPiece) | Should -BeTrue } } } finally { if (Test-Path -Path $transcriptPath) { Wait-ScriptBlockReturnTrue -ScriptBlock {-not (Test-IsFileLocked -Path $transcriptPath)} ` -TimeoutSeconds 10 Remove-Item -Path $transcriptPath -Force } } } <# .SYNOPSIS Retrieves the administrator credential on an AppVeyor machine. The password will be reset so that we know what the password is. .NOTES The AppVeyor credential will be cached after the first call to this function so that the password is not reset if this function is called again. #> function Get-AppVeyorAdministratorCredential { [OutputType([System.Management.Automation.PSCredential])] [CmdletBinding()] param () if ($null -eq $script:appVeyorAdministratorCredential) { $password = '' $randomGenerator = New-Object -TypeName 'System.Random' $passwordLength = Get-Random -Minimum 15 -Maximum 126 while ($password.Length -lt $passwordLength) { $password = $password + [Char]$randomGenerator.Next(45, 126) } # Change password $appVeyorAdministratorUsername = 'appveyor' $appVeyorAdministratorUser = [ADSI]("WinNT://$($env:computerName)/$appVeyorAdministratorUsername") $null = $appVeyorAdministratorUser.SetPassword($password) [Microsoft.Win32.Registry]::SetValue('HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon', 'DefaultPassword', $password) $securePassword = ConvertTo-SecureString -String $password -AsPlainText -Force $script:appVeyorAdministratorCredential = New-Object -TypeName 'System.Management.Automation.PSCredential' -ArgumentList @( "$($env:computerName)\$appVeyorAdministratorUsername", $securePassword ) } return $script:appVeyorAdministratorCredential } <# .SYNOPSIS Enters a DSC Resource test environment. .PARAMETER DscResourceModuleName The name of the module that contains the DSC Resource to test. .PARAMETER DscResourceName The name of the DSC resource to test. .PARAMETER TestType Specifies whether the test environment will run a Unit test or an Integration test. #> function Enter-DscResourceTestEnvironment { [OutputType([System.Collections.Hashtable])] [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $DscResourceModuleName, [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $DscResourceName, [Parameter(Mandatory = $true)] [ValidateSet('Unit', 'Integration')] [System.String] $TestType ) $testsFolderPath = Split-Path -Path $PSScriptRoot -Parent $moduleRootPath = Split-Path -Path $testsFolderPath -Parent $dscResourceTestsPath = Join-Path -Path $moduleRootPath -ChildPath 'DSCResource.Tests' $testHelperFilePath = Join-Path -Path $dscResourceTestsPath -ChildPath 'TestHelper.psm1' if (Test-DscResourceTestsNeedsInstallOrUpdate) { Install-DscResourceTestsModule } Import-Module -Name $testHelperFilePath return Initialize-TestEnvironment ` -DSCModuleName $DscResourceModuleName ` -DSCResourceName $DscResourceName ` -TestType $TestType } <# .SYNOPSIS Tests to see if DSCResource.Tests needs to be downloaded or updated. .DESCRIPTION This function returns true if the DSCResource.Tests content needs to be downloaded or updated. A magic file in the .Git folder of DSCResource.Tests is used to determine if the repository needs to be updated. If the last write time of the magic file is over a specified number of minutes old then this will cause the function to return true. .PARAMETER RefreshAfterMinutes The number of minutes old the magic file should be before requiring an update. Defaults to the value defined in $script:dscResourceTestsRefreshAfterMinutes #> function Test-DscResourceTestsNeedsInstallOrUpdate { [OutputType([System.Boolean])] [CmdletBinding()] param ( [Parameter()] [System.Int32] $RefreshAfterMinutes = $script:dscResourceTestsRefreshAfterMinutes ) $testsFolderPath = Split-Path -Path $PSScriptRoot -Parent $moduleRootPath = Split-Path -Path $testsFolderPath -Parent $dscResourceTestsPath = Join-Path -Path $moduleRootPath -ChildPath 'DSCResource.Tests' if (Test-Path -Path $dscResourceTestsPath) { $magicFilePath = Get-DscResourceTestsMagicFilePath -DscResourceTestsPath $DscResourceTestsPath if (Test-Path -Path $magicFilePath) { $magicFileLastWriteTime = (Get-Item -Path $magicFilePath).LastWriteTime $magicFileAge = New-TimeSpan -End (Get-Date) -Start $magicFileLastWriteTime if ($magicFileAge.Minutes -lt $RefreshAfterMinutes) { Write-Debug -Message ('DSCResource.Tests was last updated {0} minutes ago. Update not required.' -f $magicFileAge.Minutes) return $false } else { Write-Verbose -Message ('DSCResource.Tests was last updated {0} minutes ago. Update required.' -f $magicFileAge.Minutes) -Verbose } } } return $true } <# .SYNOPSIS Installs the DSCResource.Tests content. .DESCRIPTION This function uses Git to install or update the DSCResource.Tests repository. It will then create or update the magic file in the .git folder in the DSCResource.Tests folder. If Git is not installed and the DSCResource.Tests folder is not available then an exception will be thrown. If the DSCResource.Tests folder does exist but Git is not installed then a warning will be displayed and the repository will not be pulled. #> function Install-DscResourceTestsModule { [CmdletBinding()] param ( ) $testsFolderPath = Split-Path -Path $PSScriptRoot -Parent $moduleRootPath = Split-Path -Path $testsFolderPath -Parent $dscResourceTestsPath = Join-Path -Path $moduleRootPath -ChildPath 'DSCResource.Tests' $gitInstalled = $null -ne (Get-Command -Name 'git' -ErrorAction 'SilentlyContinue') $writeMagicFile = $false if (Test-Path -Path $dscResourceTestsPath) { if ($gitInstalled) { Push-Location -Path $dscResourceTestsPath Write-Verbose -Message 'Updating DSCResource.Tests.' -Verbose & git @('pull','origin','dev','--quiet') $writeMagicFile = $true Pop-Location } else { Write-Warning -Message 'Git not installed. DSCResource.Tests will not be updated.' } } else { if (-not $gitInstalled) { throw 'Git not installed. Can not pull DSCResource.Tests.' } Push-Location -Path $moduleRootPath Write-Verbose -Message 'Cloning DSCResource.Tests.' -Verbose & git @('clone','https://github.com/PowerShell/DscResource.Tests','--quiet') $writeMagicFile = $true Pop-Location } if ($writeMagicFile) { # Write the magic file $magicFilePath = Get-DscResourceTestsMagicFilePath -DscResourceTestsPath $DscResourceTestsPath $null = Set-Content -Path $magicFilePath -Value (Get-Date) -Force } } <# .SYNOPSIS Gets the full path of the magic file used to determine the last date/time the DSCResource.Tests folder was updated. .PARAMETER DscResourceTestsPath The path to the folder that contains DSCResource.Tests. #> function Get-DscResourceTestsMagicFilePath { param ( [Parameter(Mandatory = $true)] [System.String] $DscResourceTestsPath ) return $DscResourceTestsPath | Join-Path -ChildPath '.git' | Join-Path -ChildPath $script:dscResourceTestsMagicFile } <# .SYNOPSIS Exits the specified DSC Resource test environment. .PARAMETER TestEnvironment The test environment to exit. #> function Exit-DscResourceTestEnvironment { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.Collections.Hashtable] $TestEnvironment ) $testsFolderPath = Split-Path -Path $PSScriptRoot -Parent $moduleRootPath = Split-Path -Path $testsFolderPath -Parent $dscResourceTestsPath = Join-Path -Path $moduleRootPath -ChildPath 'DSCResource.Tests' $testHelperFilePath = Join-Path -Path $dscResourceTestsPath -ChildPath 'TestHelper.psm1' Import-Module -Name $testHelperFilePath Restore-TestEnvironment -TestEnvironment $TestEnvironment } <# .SYNOPSIS Finds an unused TCP port in the specified port range. By default, searches within ports 38473 - 38799, which at the time of writing, show as unassigned in: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml .PARAMETER LowestPortNumber The TCP port number at which to begin the unused port search. Must be greater than 0. .PARAMETER HighestPortNumber The highest TCP port number to search for unused ports within. Must be greater than 0, and greater than LowestPortNumber. .PARAMETER ExcludePorts TCP ports to exclude from the search, even if they fall within the LowestPortNumber and HighestPortNumber range. #> function Get-UnusedTcpPort { [OutputType([System.UInt16])] [CmdletBinding()] param ( [Parameter()] [ValidateScript({$_ -gt 0})] [System.UInt16] $LowestPortNumber = 38473, [Parameter()] [ValidateScript({$_ -gt $0})] [System.UInt16] $HighestPortNumber = 38799, [Parameter()] [System.UInt16[]] $ExcludePorts = @() ) if ($HighestPortNumber -lt $LowestPortNumber) { throw 'HighestPortNumber must be greater than or equal to LowestPortNumber' } [System.UInt16] $unusedPort = 0 [System.Collections.ArrayList] $usedAndExcludedPorts = (Get-NetTCPConnection).LocalPort | Where-Object -FilterScript { $_ -ge $LowestPortNumber -and $_ -le $HighestPortNumber } if (!(Test-Path -Path variable:usedAndExcludedPorts) -or ($null -eq $usedAndExcludedPorts)) { [System.Collections.ArrayList] $usedAndExcludedPorts = @() } if (!(Test-Path -Path variable:ExcludePorts) -or ($null -eq $ExcludePorts)) { $ExcludePorts = @() } $null = $usedAndExcludedPorts.Add($ExcludePorts) foreach ($port in $LowestPortNumber..$HighestPortNumber) { if (!($usedAndExcludedPorts.Contains($port))) { $unusedPort = $port break } } if ($unusedPort -eq 0) { throw "Failed to find unused TCP port between ports $LowestPortNumber and $HighestPortNumber." } return $unusedPort } Export-ModuleMember -Function @( 'Test-GetTargetResourceResult', ` 'Wait-ScriptBlockReturnTrue', ` 'Test-IsFileLocked', ` 'Test-SetTargetResourceWithWhatIf', ` 'Get-AppVeyorAdministratorCredential', ` 'Enter-DscResourceTestEnvironment', ` 'Exit-DscResourceTestEnvironment', ` 'Invoke-GetTargetResourceUnitTest', ` 'Invoke-SetTargetResourceUnitTest', ` 'Invoke-TestTargetResourceUnitTest', ` 'Invoke-ExpectedMocksAreCalledTest', ` 'Invoke-GenericUnitTest', ` 'Get-UnusedTcpPort' ) |