Functions/Assertions/BeNullOrEmpty.ps1
function PesterBeNullOrEmpty([object[]] $ActualValue, [switch] $Negate, [string] $Because) { if ($null -eq $ActualValue -or $ActualValue.Count -eq 0) { $succeeded = $true } elseif ($ActualValue.Count -eq 1) { $expandedValue = $ActualValue[0] if ($expandedValue -is [hashtable]) { $succeeded = $expandedValue.Count -eq 0 } else { $succeeded = [String]::IsNullOrEmpty($expandedValue) } } else { $succeeded = $false } if ($Negate) { $succeeded = -not $succeeded } $failureMessage = '' if (-not $succeeded) { if ($Negate) { $failureMessage = NotPesterBeNullOrEmptyFailureMessage -Because $Because } else { $failureMessage = PesterBeNullOrEmptyFailureMessage -ActualValue $ActualValue -Because $Because } } return New-Object psobject -Property @{ Succeeded = $succeeded FailureMessage = $failureMessage } } function PesterBeNullOrEmptyFailureMessage($ActualValue, $Because) { return "Expected `$null or empty,$(Format-Because $Because) but got $(Format-Nicely $ActualValue)." } function NotPesterBeNullOrEmptyFailureMessage ($Because) { return "Expected a value,$(Format-Because $Because) but got `$null or empty." } Add-AssertionOperator -Name BeNullOrEmpty ` -Test $function:PesterBeNullOrEmpty ` -SupportsArrayInput # 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