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$testObject = New-Object psobject -Property @{
    SomeProperty = 'SomeValue'
}

($testObject | Get-Member -Name "SomeProperty" -Membertype Properties) -is [Object]

if ($testObject.PSObject.Properties['SomeProperty']) {
    Write-Host "SomeProperty exists"
}

if (!$testObject.PSObject.Properties['SomeProperty']) {
    Write-Host "SomeProperty does not exists"
}
# Returns True/False for existence
($testObject.PSObject.Properties['SomeProperty'] -eq $null)