Check if the an application pool exists on a remote server.

WebAdmin.Test-WebAppExists.ps1

<#
.SYNOPSIS
	Tests if a web application exists (this can be a site or application).
	This was only written to keep naming conventions consistent. This is the same as
	Test-Path IIS:\Sites\$SiteName;

.PARAMETER Url
	The url of the match on

.PARAMETER Environment
	The environment to apply this to

.EXAMPLE
	Test-WebAppExists -Environment Dev -Url "http://unittest.{env}.place.something.com/services"

#>
Function Test-WebAppExists {
Param (
    [string] $ServerName = $env:COMPUTERNAME,
	[Parameter(Mandatory = $true)]
	[string] $Url
)

    # setup variables
	$appPoolName = ConvertTo-UrlBasedAppPoolName -Url $Url

	$scriptBlock = {
        if($appPoolName -eq $null) {
            $appPoolName = $args[0]
        }

        Import-Module WebAdministration

        $pathToTest = "IIS:\AppPools\{0}" -f $appPoolName

        if((Test-Path $pathToTest) -eq $false) { return $false }

        $app = Get-Item $pathToTest

        $exists = $true
        if($app -eq $null) { $exists = $false }
        if($app.GetType().Fullname -ne "Microsoft.IIs.PowerShell.Framework.ConfigurationElement") { $exists = $false }

		return $exists;
	} # end scriptblock

    $parameters = @($appPoolName)
    if(Test-IsLocalComputerName -ComputerName $ServerName) {
        $exists = . $scriptBlock
    } else {
        $exists = Invoke-Command -ComputerName $ServerName -ScriptBlock $scriptBlock -ArgumentList $parameters
    }

	return $exists;
}