Powershell with PSEventing and Nunit to watch my bin folder and auto run tests

PSAutoTest

if ( (Get-PSSnapin -Name pseventing -ErrorAction SilentlyContinue) -eq $null )
{
    Add-PsSnapin pseventing
}

Start-KeyHandler -CaptureCtrlC

$Script:initialdir = "C:\SG\SDP\Trunk\SDP\SDP"

$fsw = new-object system.io.filesystemwatcher
$fsw.Path = "$initialdir\Bin\Desktop\"
$fsw.EnableRaisingEvents = $true

connect-event fsw changed,created

WRITE-HOST "watching $($fsw.path)" -ForegroundColor Yellow
WRITE-HOST "entering loop... ctrl+c to exit" -ForegroundColor Yellow

$done = $false;
while ($events = @(read-event -wait)) {
	# read-event always returns a collection
	foreach ($event in $events) {	
        WRITE-HOST $event.name    
		switch ($event.name) {
		    "ctrlc" {
		        WRITE-HOST "Cancelling..." -ForegroundColor Yellow
		        $done = $true
		    }		    
			{($_ = "Changed") -or ($_ = "Created") } 
            {
			    $file = $event.Args.FullPath                 
                $filter = "*Order*.*Tests*.dll"
                #$file = $Event.SourceEventArgs.FullPath 
                if($file -like $filter)
                {
                    $nunit = "C:\SG\SDP\Trunk\SDP\3rdParty\NUnit-2.5.2\nunit-console"
                    $currentdate = get-date -format g
                    write-Host "Running Tests on $file $currentdate" -ForegroundColor Yellow
             	    &"$nunit" /out:$file.Name_testresult.txt $file 2>&1		
                    if($LastExitCode -ne 0)
                    {
                       WRITE-HOST "Test have failed for $file"-ForegroundColor RED             
                    } 
                    else
                    {
                      WRITE-HOST "Test have passed for $file"-ForegroundColor GREEN
                    }
                }
			}
		}
	}	
	if ($done -eq $true) {
        Disconnect-Event fsw changed,created
		break
	}
}