Testing PowerShell function with timer and writing progress and also seeing the interesting pipeline management in action

Test-TimedProcessFunction.ps1

function Test-TimedProcessFunction {
	[OutputType([String])]
	[CmdletBinding(
		SupportsShouldProcess=$true,
		ConfirmImpact="None" 
	)]
	param (
		[Parameter(Position=1, Mandatory=$true, ValueFromPipeline=$true)]
		[ValidateNotNullOrEmpty()]
		[string]$Name,
		[Parameter(Position=2, ValueFromPipeline=$true)]
		[ValidateRange(1,10)]
		[int]$Iteration = 1
	)
	Begin{
		$formats = @{
			"Begin" = "Begin {0}...";
			"Process" = "...processing {0}...";
			"End" = "...ending {0}";
		};
		Write-Verbose -Message ($formats.Begin -f "$($MyInvocation.MyCommand) $(Get-Date -Format o)");
		$timer = [System.Diagnostics.Stopwatch]::StartNew();
		$totalTime = $timer.Elapsed;
	} Process {
		if ($pscmdlet.ShouldProcess($Name)) {
			for($i = 0; $i -lt $Iteration; $i++ ){
				Write-Progress -Id $MyInvocation.PipelinePosition -Activity $MyInvocation.MyCommand -Status "Total time:$($totalTime.ToString())" -PercentComplete $($i/$Iteration*100) -CurrentOperation $($timer.Elapsed.ToString()+" $Name");
				Write-Verbose -Message ($formats.Process -f $MyInvocation.MyCommand);
				"$Name$i";
			}
		}
		$totalTime += $timer.Elapsed;
		$timer.Restart();
	} End {	
		Write-Progress -Id $MyInvocation.PipelinePosition -Activity $MyInvocation.MyCommand -Completed;
		$timer.Stop();
		Write-Verbose -Message ($formats.End -f "$($MyInvocation.MyCommand) $($timer.Elapsed.ToString())");
	}
}
"Bob","Charlie","Marry","1","2","3","4","5" | Test-TimedProcessFunction -Iteration 5 | Test-TimedProcessFunction -Iteration 2 | Test-TimedProcessFunction -Iteration 10 | Out-Null