Assistance in properly scripting a Join and Un-Join Domain script - powershell

Question

Hello guys i have started to create a script that would basically automate the un-join and joining of a computer via a script this initially works fine right up until the point i need to start pinging for the computer to come back online. For the instance of un-joining it works fine but all the issue arise when trying to join.
Maybe fresh pair of eyes can lend me some Intel on the matter thank you.
<#
############################################################################################################
# Written by CPineda # NOTE: This only works if computer is on the wire. #
# This Script un-joins and re-joins the domain. # So its very important that we connect the devce #
# Created: 04/27/2016 # to the LAN. #
# Last revision 4/6/2016 # #
############################################################################################################
#>
# Set up your Variables
$ComputerIP = "" #Stores the Computers IP
$ComputerName = "" #Stores the Name of the computer you will be working with.
#$LocalCredentials = "" #Stores the Local Administrator credentials. (As Neeeded)
$DomainCredentials = "" #Stores the Domain Administrator credentials.
# Get information needed for the script to run.
while ($ComputerIP -eq ""){
Clear-Host #Clear the PS Console Window
$ComputerIP = Read-Host "Enter the name of the Computer IP"
}
while ($ComputerName -eq ""){
Clear-Host #Clear the PS Console Window
$ComputerName = Read-Host "Enter the name of the Computer"
}
<# while ($LocalCredentials -eq ""){
Clear-Host #Clear the PS Console Window
$LocalCredentials = Read-Host "Enter the User name of the Local User Admin Account"
}
#>
while ($DomainCredentials -eq ""){
Clear-Host #Clear the PS Console Window
$DomainCredentials = Read-Host "Enter the User name of the Domain User Admin Account"
}
# Remove the computer from the Domain.
Remove-Computer -ComputerName $ComputerName -LocalCredential $ComputerName\administrator -UnJoinDomainCredential kelsonfla\$DomainCredentials -WorkgroupName WORKGROUP -Force -Restart
Read-Host "Hit ENTER to continue"
# Ping until computer returns on the wire.
Clear-Host
Write-Host "At this time we will ping the compputer in question untill it returns back online"
Write-Host "Hit ENTER to continue"
Read-Host
Test-Connection ($ComputerIP) {
$result = Test-Connection $ComputerIP -Count 3 -Delay 10 -Quiet
if ($Result | where { $_ -match 'Reply from ' }){$true}
else {$false}
}
Write-Verbose "The computer $ComputerIP has went down for a reboot. Waiting for it to come back up..."
while (!(Test-Connection -ComputerName $ComputerIP)) {
Start-Sleep -Seconds 5
Write-Verbose "Waiting for $ComputerIP to come back online"
}
Write-Verbose "The computer $ComputerIP has come online. Waiting for OS to initialize"
$EapBefore = $ErrorActionPreference
$ErrorActionPreference = [System.Management.Automation.ActionPreference]::SilentlyContinue
while (!(Get-WmiObject -ComputerName $ComputerIP -Class Win32_OperatingSystem -Credential $LocalCredentials)) {
Start-Sleep -Seconds 5
Write-Verbose "Waiting for OS to initialize..."
$ErrorActionPreference = $EapBefore
}
# Add computer back to the Domain.
Add-Computer -ComputerName $ComputerIP -LocalCredential $ComputerName\administrator -DomainName kelsonfla.local -Credential kelsonfla\$DomainCredentials -Restart -Force
Read-Host "Hit ENTER to continue"
# Ping until computer returns on the wire.
Clear-Host
Write-Host "At this time we will ping the compputer in question untill it returns back online"
Write-Host "Hit ENTER to continue"
Read-Host
Test-Connection ($ComputerIP) {
$result = Test-Connection $ComputerIP -Count 3 -Delay 10 -Quiet
if ($Result | where { $_ -match 'Reply from ' }){$true}
else {$false}
}
Write-Verbose "The computer $ComputerIP has went down for a reboot. Waiting for it to come back up..."
while (!(Test-Connection -ComputerName $ComputerIP)) {
Start-Sleep -Seconds 5
Write-Verbose "Waiting for $ComputerIP to come back online"
}
Write-Verbose "The computer $ComputerIP has come online. Waiting for OS to initialize"
$EapBefore = $ErrorActionPreference
$ErrorActionPreference = [System.Management.Automation.ActionPreference]::SilentlyContinue
while (!(Get-WmiObject -ComputerName $ComputerIP -Class Win32_OperatingSystem -Credential $LocalCredentials)) {
Start-Sleep -Seconds 5
Write-Verbose "Waiting for OS to initialize..."
$ErrorActionPreference = $EapBefore
}
Clear-Host
Write-Output "If you are Reading this then you have successfully Unjoined and Re-Joined a Computer to the Network"
Start-Sleep -Seconds 3
Clear-Host

Answer 1

First : for the ping part, you should remove the code :
Test-Connection ($ComputerIP) {
$Result = ping $ComputerIP -n 3
if ($Result | where { $_ -match 'Reply from ' }) {
$true
} else {
$false
}
}
and simply use
!$result = $false
do {
Write-Verbose "Waiting for $ComputerIP to come back online"
$result = Test-Connection $ComputerIP -Count 2 -Delay 5 -Quiet
} while (!$result)
And then use the value of the $result boolean to see if your computer is reponding again. Test-Connection is a Cmdlet that cover the ping role.