internal/Test-SqlAgent.ps1

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Function Test-SqlAgent
{
<#
.SYNOPSIS
Internal function. Checks to see if SQL Server Agent is running on a server.
#>

    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [Alias("ServerInstance", "SqlInstance")]
        [object]$SqlServer,
        [System.Management.Automation.PSCredential]$SqlCredential
    )
    
    if ($SqlServer.GetType() -ne [Microsoft.SqlServer.Management.Smo.Server])
    {
        $SqlServer = Connect-SqlServer -SqlServer $SqlServer -SqlCredential $SqlCredential
    }
    
    if ($SqlServer.JobServer -eq $null) { return $false }
    try { $null = $SqlServer.JobServer.script(); return $true }
    catch { return $false }
}