Not able to Register-ObjectEvent for System.Diagnostics.Eventlog "EntryWritten" Event

Question

Hi,
I'm trying to listen for an entry in an EventLog created. 
New-EventLog -LogName TestLog -Source "MyScript" # This is my eventlog
# And for monitoring, the code goes like this:
$testlogs = Get-EventLog -LogName TestLog
Register-ObjectEvent -INputObject $testlogs -SourceIdentifier NewEventLogEntry -EventName EntryWritten -Action{....some actions...}
But I'm encountering an error:
Register-ObjectEvent : Cannot register for event. An event with name 'EntryWritten' does not exist.
Parameter name: eventName
At line:1 char:1
+ Register-ObjectEvent -InputObject $testlogs -SourceIdentifier NewEventLogEntry - ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (System.Diagnostics.EventLogEntry:EventLogEntry) [Register-ObjectEvent], ArgumentExce 
   ption
    + FullyQualifiedErrorId : INVALID_REGISTRATION,Microsoft.PowerShell.Commands.RegisterObjectEventCommand
What's wrong with this one ? Thanks in advance !

Answer 1

This works for me:
New-EventLog -LogName TestLog -Source "MyScript" # This is my eventlog
$testlogs = Get-EventLog -List | Where-Object {$_.Log -eq 'TestLog'}
Register-ObjectEvent -InputObject $testlogs -EventName EntryWritten -SourceIdentifier NewEventLogEntry -Action{Write-Host "New entry"}
Write-EventLog -LogName TestLog -Source "MyScript" -EntryType Information -EventId 1 -Message "this is a test"