Helper/Test-Module.ps1
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function Test-Module { <# .SYNOPSIS Tests if the given module exists on the local system. .DESCRIPTION Tests if the given module is installed on the local system. It returns a bool value as result. .PARAMETER Name Define a item name you need to test .PARAMETER Type Define the dependency type. This could be a Module or PSnapin. .PARAMETER MessagePattern You an optionally adjust the message pattern for the error message itself. The available placeholders are: - {0} : Type - {1} : Name .PARAMETER StopIfFails This switch forces the entire script to stop if the given dependency object fails. .INPUTS [None] .OUTPUTS [Bool] .EXAMPLE .\Test-Dependency -Name 'VMware.PowerCLI' -Type 'Module' .EXAMPLE .\Test-Dependency -Name 'VMware.PowerCLI' -Type 'Module' -StopIfFails .NOTES File Name : Get-RandomKey.ps1 Author : Marco Blessing - marco.blessing@googlemail.com Requires : .LINK https://github.com/OCram85/PSCredentialStore #> [OutputType([bool])] [CmdletBinding()] param( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [string]$Name, [Parameter(Mandatory = $false)] [ValidateSet('Module', 'PSSnapin', 'Custom')] [string]$Type = 'Module', [Parameter(Mandatory = $false)] [ValidateNotNullOrEmpty()] [string]$MessagePattern = @" Could not find the required {0} called {1}. Please install the required {0} to run this function! "@, [Parameter(Mandatory = $false)] [switch]$StopIfFails ) begin { } process { $Message = $MessagePattern -f $Type, $Name Write-Debug $Message switch ($Type) { 'Module' { if (Get-Module -Name $Name -ListAvailable) { return $true } else { if ($StopIfFails) { Write-Error -Message $Message -ErrorAction Stop -Category NotInstalled } return $false } } 'PSSnapin' { if (Get-PSSnapin -Name $Name -Registered) { return $true } else { if ($StopIfFails) { Write-Error -Message $Message -ErrorAction Stop -Category NotInstalled return $false } } } 'Custom' { Throw 'Custom tests are not implemented yet!' } } } end { } } |