Pester

4.10.2-beta1

Functions/Assertions/HaveCount.ps1

                                function Should-HaveCount($ActualValue, [int] $ExpectedValue, [switch] $Negate, [string] $Because) {

    <#

.SYNOPSIS

Asserts that a collection has the expected amount of items.

.EXAMPLE

1,2,3 | Should -HaveCount 3

This test passes, because it expected three objects, and received three.

This is like running `@(1,2,3).Count` in PowerShell.

#>

    if ($ExpectedValue -lt 0) {

        throw [ArgumentException]"Excpected collection size must be greater than or equal to 0."

    }

    $count = if ($null -eq $ActualValue) {

        0

    }

    else {

        $ActualValue.Count

    }

    $expectingEmpty = $ExpectedValue -eq 0

    [bool] $succeeded = $count -eq $ExpectedValue

    if ($Negate) {

        $succeeded = -not $succeeded

    }

    if (-not $succeeded) {

        if ($Negate) {

            $expect = if ($expectingEmpty) {

                "Expected a non-empty collection"

            }

            else {

                "Expected a collection with size different from $(Format-Nicely $ExpectedValue)"

            }

            $but = if ($count -ne 0) {

                "but got collection with that size $(Format-Nicely $ActualValue)."

            }

            else {

                "but got an empty collection."

            }

            return New-Object psobject -Property @{

                Succeeded      = $false

                FailureMessage = "$expect,$(Format-Because $Because) $but"

            }

        }

        else {

            $expect = if ($expectingEmpty) {

                "Expected an empty collection"

            }

            else {

                "Expected a collection with size $(Format-Nicely $ExpectedValue)"

            }

            $but = if ($count -ne 0) {

                "but got collection with size $(Format-Nicely $count) $(Format-Nicely $ActualValue)."

            }

            else {

                "but got an empty collection."

            }

            return New-Object psobject -Property @{

                Succeeded      = $false

                FailureMessage = "$expect,$(Format-Because $Because) $but"

            }

        }

    }

    return New-Object psobject -Property @{

        Succeeded = $true

    }

}

Add-AssertionOperator -Name         HaveCount `

    -InternalName Should-HaveCount `

    -Test         ${function:Should-HaveCount} `

    -SupportsArrayInput

function ShouldHaveCountFailureMessage() {

}

function NotShouldHaveCountFailureMessage() {

}

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