Pester

4.10.2-beta1

Functions/Assertions/BeNullOrEmpty.ps1

                                
function Should-BeNullOrEmpty([object[]] $ActualValue, [switch] $Negate, [string] $Because) {

    <#

.SYNOPSIS

Checks values for null or empty (strings).

The static [String]::IsNullOrEmpty() method is used to do the comparison.

.EXAMPLE

$null | Should -BeNullOrEmpty

This test will pass. $null is null.

.EXAMPLE

$null | Should -Not -BeNullOrEmpty

This test will fail and throw an error.

.EXAMPLE

@() | Should -BeNullOrEmpty

An empty collection will pass this test.

.EXAMPLE

""  | Should -BeNullOrEmpty

An empty string will pass this test.

#>

    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 = NotShouldBeNullOrEmptyFailureMessage -Because $Because

        }

        else {

            $failureMessage = ShouldBeNullOrEmptyFailureMessage -ActualValue $ActualValue -Because $Because

        }

    }

    return New-Object psobject -Property @{

        Succeeded      = $succeeded

        FailureMessage = $failureMessage

    }

}

function ShouldBeNullOrEmptyFailureMessage($ActualValue, $Because) {

    return "Expected `$null or empty,$(Format-Because $Because) but got $(Format-Nicely $ActualValue)."

}

function NotShouldBeNullOrEmptyFailureMessage ($Because) {

    return "Expected a value,$(Format-Because $Because) but got `$null or empty."

}

Add-AssertionOperator -Name               BeNullOrEmpty `

    -InternalName       Should-BeNullOrEmpty `

    -Test               ${function:Should-BeNullOrEmpty} `

    -SupportsArrayInput

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# SIG # End signature block