Check to see if a service exists.
    Test-ServiceExists [-Name] <String> [[-ComputerName] <String>] [-PassThru] [[-ContinueOnError] <Boolean>] [<CommonParameters>]
    Check to see if a service exists (using WMI method because Get-Service will generate ErrorRecord if service doesn't exist).
    -Name <String>
        Specify the name of the service.
        Note: Service name can be found by executing "Get-Service | Format-Table -AutoSize -Wrap" or by using the properties screen of a service in services.msc.
    -ComputerName <String>
        Specify the name of the computer. Default is: the local computer.
    -PassThru [<SwitchParameter>]
        Return the WMI service object.
    -ContinueOnError <Boolean>
        Continue if an error is encountered. Default is: $true.
        This cmdlet supports the common parameters: Verbose, Debug,
        ErrorAction, ErrorVariable, WarningAction, WarningVariable,
        OutBuffer, PipelineVariable, and OutVariable. For more information, see 
        about_CommonParameters (https:/go.microsoft.com/fwlink/?LinkID=113216). 
    -------------------------- EXAMPLE 1 --------------------------
    PS C:\>Test-ServiceExists -Name 'wuauserv'
    -------------------------- EXAMPLE 2 --------------------------
    PS C:\>Test-ServiceExists -Name 'testservice' -PassThru | Where-Object { $_ } | ForEach-Object { $_.Delete() }
    Check if a service exists and then delete it by using the -PassThru parameter.
    To see the examples, type: "get-help Test-ServiceExists -examples".
    For more information, type: "get-help Test-ServiceExists -detailed".
    For technical information, type: "get-help Test-ServiceExists -full".
    For online help, type: "get-help Test-ServiceExists -online"