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() {
}

# SIG # Begin signature block
# MIIZbgYJKoZIhvcNAQcCoIIZXzCCGVsCAQExCzAJBgUrDgMCGgUAMGkGCisGAQQB
# gjcCAQSgWzBZMDQGCisGAQQBgjcCAR4wJgIDAQAABBAfzDtgWUsITrck0sYpfvNR
# AgEAAgEAAgEAAgEAAgEAMCEwCQYFKw4DAhoFAAQUA9FZoIr/Qis+B3Uv7asGdjXX
# J9agghR8MIIE/jCCA+agAwIBAgIQDUJK4L46iP9gQCHOFADw3TANBgkqhkiG9w0B
# AQsFADByMQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYD
# VQQLExB3d3cuZGlnaWNlcnQuY29tMTEwLwYDVQQDEyhEaWdpQ2VydCBTSEEyIEFz
# c3VyZWQgSUQgVGltZXN0YW1waW5nIENBMB4XDTIxMDEwMTAwMDAwMFoXDTMxMDEw
# NjAwMDAwMFowSDELMAkGA1UEBhMCVVMxFzAVBgNVBAoTDkRpZ2lDZXJ0LCBJbmMu
# MSAwHgYDVQQDExdEaWdpQ2VydCBUaW1lc3RhbXAgMjAyMTCCASIwDQYJKoZIhvcN
# AQEBBQADggEPADCCAQoCggEBAMLmYYRnxYr1DQikRcpja1HXOhFCvQp1dU2UtAxQ
# tSYQ/h3Ib5FrDJbnGlxI70Tlv5thzRWRYlq4/2cLnGP9NmqB+in43Stwhd4CGPN4
# bbx9+cdtCT2+anaH6Yq9+IRdHnbJ5MZ2djpT0dHTWjaPxqPhLxs6t2HWc+xObTOK
# fF1FLUuxUOZBOjdWhtyTI433UCXoZObd048vV7WHIOsOjizVI9r0TXhG4wODMSlK
# XAwxikqMiMX3MFr5FK8VX2xDSQn9JiNT9o1j6BqrW7EdMMKbaYK02/xWVLwfoYer
# vnpbCiAvSwnJlaeNsvrWY4tOpXIc7p96AXP4Gdb+DUmEvQECAwEAAaOCAbgwggG0
# MA4GA1UdDwEB/wQEAwIHgDAMBgNVHRMBAf8EAjAAMBYGA1UdJQEB/wQMMAoGCCsG
# AQUFBwMIMEEGA1UdIAQ6MDgwNgYJYIZIAYb9bAcBMCkwJwYIKwYBBQUHAgEWG2h0
# dHA6Ly93d3cuZGlnaWNlcnQuY29tL0NQUzAfBgNVHSMEGDAWgBT0tuEgHf4prtLk
# YaWyoiWyyBc1bjAdBgNVHQ4EFgQUNkSGjqS6sGa+vCgtHUQ23eNqerwwcQYDVR0f
# BGowaDAyoDCgLoYsaHR0cDovL2NybDMuZGlnaWNlcnQuY29tL3NoYTItYXNzdXJl
# ZC10cy5jcmwwMqAwoC6GLGh0dHA6Ly9jcmw0LmRpZ2ljZXJ0LmNvbS9zaGEyLWFz
# c3VyZWQtdHMuY3JsMIGFBggrBgEFBQcBAQR5MHcwJAYIKwYBBQUHMAGGGGh0dHA6
# Ly9vY3NwLmRpZ2ljZXJ0LmNvbTBPBggrBgEFBQcwAoZDaHR0cDovL2NhY2VydHMu
# ZGlnaWNlcnQuY29tL0RpZ2lDZXJ0U0hBMkFzc3VyZWRJRFRpbWVzdGFtcGluZ0NB
# LmNydDANBgkqhkiG9w0BAQsFAAOCAQEASBzctemaI7znGucgDo5nRv1CclF0CiNH
# o6uS0iXEcFm+FKDlJ4GlTRQVGQd58NEEw4bZO73+RAJmTe1ppA/2uHDPYuj1UUp4
# eTZ6J7fz51Kfk6ftQ55757TdQSKJ+4eiRgNO/PT+t2R3Y18jUmmDgvoaU+2QzI2h
# F3MN9PNlOXBL85zWenvaDLw9MtAby/Vh/HUIAHa8gQ74wOFcz8QRcucbZEnYIpp1
# FUL1LTI4gdr0YKK6tFL7XOBhJCVPst/JKahzQ1HavWPWH1ub9y4bTxMd90oNcX6X
# t/Q/hOvB46NJofrOp79Wz7pZdmGJX36ntI5nePk2mOHLKNpbh6aKLzCCBQ0wggP1
# oAMCAQICEAPBBFtdmcD9x4iXgGyKU+cwDQYJKoZIhvcNAQELBQAwcjELMAkGA1UE
# BhMCVVMxFTATBgNVBAoTDERpZ2lDZXJ0IEluYzEZMBcGA1UECxMQd3d3LmRpZ2lj
# ZXJ0LmNvbTExMC8GA1UEAxMoRGlnaUNlcnQgU0hBMiBBc3N1cmVkIElEIENvZGUg
# U2lnbmluZyBDQTAeFw0yMTAxMjgwMDAwMDBaFw0yNDAxMzEyMzU5NTlaMEsxCzAJ
# BgNVBAYTAkNaMQ4wDAYDVQQHEwVQcmFoYTEVMBMGA1UECgwMSmFrdWIgSmFyZcWh
# MRUwEwYDVQQDDAxKYWt1YiBKYXJlxaEwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAw
# ggEKAoIBAQC154nkzSQ95K1yCflVL3iFQhzw/25ht4o506hK7ATFgvP71ZI+YHce
# gvVoMtaMhJp2/EzXsgxDF7EZBR4Hl9vNbIpLAFSVCK4GBD0DxNCDFrJTPtNohgsA
# STNMcK6t0iunh7MEkaYt1yPgiISA1vcQUMKi51WSUxeWnsUNTkJDZkyM61fETbhy
# CI66xLItaf3OWdyjiOFPq2n8yx+eg1w7GCC/eNYVAjzqtSmiE/xv6Qoj7z9qFyS1
# pAO4cxDRLAD9IcCiYmHOJVgsho3/u4QNNm72ghz7iiRAO5lDoBcZIiLS5RKxJwMG
# nnYbIiAuISZmv4PtrkcSu81Lzmtu81idAgMBAAGjggHEMIIBwDAfBgNVHSMEGDAW
# gBRaxLl7KgqjpepxA8Bg+S32ZXUOWDAdBgNVHQ4EFgQUF2nEZEX1uTrPSD3h5VSJ
# 8g9ef20wDgYDVR0PAQH/BAQDAgeAMBMGA1UdJQQMMAoGCCsGAQUFBwMDMHcGA1Ud
# HwRwMG4wNaAzoDGGL2h0dHA6Ly9jcmwzLmRpZ2ljZXJ0LmNvbS9zaGEyLWFzc3Vy
# ZWQtY3MtZzEuY3JsMDWgM6Axhi9odHRwOi8vY3JsNC5kaWdpY2VydC5jb20vc2hh
# Mi1hc3N1cmVkLWNzLWcxLmNybDBLBgNVHSAERDBCMDYGCWCGSAGG/WwDATApMCcG
# CCsGAQUFBwIBFhtodHRwOi8vd3d3LmRpZ2ljZXJ0LmNvbS9DUFMwCAYGZ4EMAQQB
# MIGEBggrBgEFBQcBAQR4MHYwJAYIKwYBBQUHMAGGGGh0dHA6Ly9vY3NwLmRpZ2lj
# ZXJ0LmNvbTBOBggrBgEFBQcwAoZCaHR0cDovL2NhY2VydHMuZGlnaWNlcnQuY29t
# L0RpZ2lDZXJ0U0hBMkFzc3VyZWRJRENvZGVTaWduaW5nQ0EuY3J0MAwGA1UdEwEB
# /wQCMAAwDQYJKoZIhvcNAQELBQADggEBANuuPZ7LhU/v1GDprUhYch3/fov3sIxp
# wshFvufWbGxUYzxEVQSsZLdFVUzAdsCz3fKInY2ihCwqIoU5vbwKFvV1zvizat/r
# aNn5aa8H34NjEXPHQiyNykOk9CdFgk+zZn+YpeyzBMAEvQR4uB4eDv1USWkwdXPB
# VVZcjM0xEsx9H/ZZRSEGS0x3ue+shvZdPRzoWcuiK8hNcbFZr15hMGi4s0F9IxTZ
# QzoSpNJsBA/vMmkbp2SWeENn49BNx8q760e+ELMfuSBltKs8S2hB9TLrpko3nIvp
# l1323zyR6ZpWK1/FHbGkHRsSJKvOOBdlSL08+KM2kNzXez88eUae+1YwggUwMIIE
# GKADAgECAhAECRgbX9W7ZnVTQ7VvlVAIMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNV
# BAYTAlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdp
# Y2VydC5jb20xJDAiBgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAe
# Fw0xMzEwMjIxMjAwMDBaFw0yODEwMjIxMjAwMDBaMHIxCzAJBgNVBAYTAlVTMRUw
# EwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20x
# MTAvBgNVBAMTKERpZ2lDZXJ0IFNIQTIgQXNzdXJlZCBJRCBDb2RlIFNpZ25pbmcg
# Q0EwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQD407Mcfw4Rr2d3B9ML
# MUkZz9D7RZmxOttE9X/lqJ3bMtdx6nadBS63j/qSQ8Cl+YnUNxnXtqrwnIal2CWs
# DnkoOn7p0WfTxvspJ8fTeyOU5JEjlpB3gvmhhCNmElQzUHSxKCa7JGnCwlLyFGeK
# iUXULaGj6YgsIJWuHEqHCN8M9eJNYBi+qsSyrnAxZjNxPqxwoqvOf+l8y5Kh5Tsx
# HM/q8grkV7tKtel05iv+bMt+dDk2DZDv5LVOpKnqagqrhPOsZ061xPeM0SAlI+sI
# ZD5SlsHyDxL0xY4PwaLoLFH3c7y9hbFig3NBggfkOItqcyDQD2RzPJ6fpjOp/Rnf
# JZPRAgMBAAGjggHNMIIByTASBgNVHRMBAf8ECDAGAQH/AgEAMA4GA1UdDwEB/wQE
# AwIBhjATBgNVHSUEDDAKBggrBgEFBQcDAzB5BggrBgEFBQcBAQRtMGswJAYIKwYB
# BQUHMAGGGGh0dHA6Ly9vY3NwLmRpZ2ljZXJ0LmNvbTBDBggrBgEFBQcwAoY3aHR0
# cDovL2NhY2VydHMuZGlnaWNlcnQuY29tL0RpZ2lDZXJ0QXNzdXJlZElEUm9vdENB
# LmNydDCBgQYDVR0fBHoweDA6oDigNoY0aHR0cDovL2NybDQuZGlnaWNlcnQuY29t
# L0RpZ2lDZXJ0QXNzdXJlZElEUm9vdENBLmNybDA6oDigNoY0aHR0cDovL2NybDMu
# ZGlnaWNlcnQuY29tL0RpZ2lDZXJ0QXNzdXJlZElEUm9vdENBLmNybDBPBgNVHSAE
# SDBGMDgGCmCGSAGG/WwAAgQwKjAoBggrBgEFBQcCARYcaHR0cHM6Ly93d3cuZGln
# aWNlcnQuY29tL0NQUzAKBghghkgBhv1sAzAdBgNVHQ4EFgQUWsS5eyoKo6XqcQPA
# YPkt9mV1DlgwHwYDVR0jBBgwFoAUReuir/SSy4IxLVGLp6chnfNtyA8wDQYJKoZI
# hvcNAQELBQADggEBAD7sDVoks/Mi0RXILHwlKXaoHV0cLToaxO8wYdd+C2D9wz0P
# xK+L/e8q3yBVN7Dh9tGSdQ9RtG6ljlriXiSBThCk7j9xjmMOE0ut119EefM2FAaK
# 95xGTlz/kLEbBw6RFfu6r7VRwo0kriTGxycqoSkoGjpxKAI8LpGjwCUR4pwUR6F6
# aGivm6dcIFzZcbEMj7uo+MUSaJ/PQMtARKUT8OZkDCUIQjKyNookAv4vcn4c10lF
# luhZHen6dGRrsutmQ9qzsIzV6Q3d9gEgzpkxYz0IGhizgZtPxpMQBvwHgfqL2vmC
# SfdibqFT+hKUGIUukpHqaGxEMrJmoecYpJpkUe8wggUxMIIEGaADAgECAhAKoSXW
# 1jIbfkHkBdo2l8IVMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYTAlVTMRUwEwYD
# VQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi
# BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0xNjAxMDcxMjAw
# MDBaFw0zMTAxMDcxMjAwMDBaMHIxCzAJBgNVBAYTAlVTMRUwEwYDVQQKEwxEaWdp
# Q2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xMTAvBgNVBAMTKERp
# Z2lDZXJ0IFNIQTIgQXNzdXJlZCBJRCBUaW1lc3RhbXBpbmcgQ0EwggEiMA0GCSqG
# SIb3DQEBAQUAA4IBDwAwggEKAoIBAQC90DLuS82Pf92puoKZxTlUKFe2I0rEDgdF
# M1EQfdD5fU1ofue2oPSNs4jkl79jIZCYvxO8V9PD4X4I1moUADj3Lh477sym9jJZ
# /l9lP+Cb6+NGRwYaVX4LJ37AovWg4N4iPw7/fpX786O6Ij4YrBHk8JkDbTuFfAnT
# 7l3ImgtU46gJcWvgzyIQD3XPcXJOCq3fQDpct1HhoXkUxk0kIzBdvOw8YGqsLwfM
# /fDqR9mIUF79Zm5WYScpiYRR5oLnRlD9lCosp+R1PrqYD4R/nzEU1q3V8mTLex4F
# 0IQZchfxFwbvPc3WTe8GQv2iUypPhR3EHTyvz9qsEPXdrKzpVv+TAgMBAAGjggHO
# MIIByjAdBgNVHQ4EFgQU9LbhIB3+Ka7S5GGlsqIlssgXNW4wHwYDVR0jBBgwFoAU
# Reuir/SSy4IxLVGLp6chnfNtyA8wEgYDVR0TAQH/BAgwBgEB/wIBADAOBgNVHQ8B
# Af8EBAMCAYYwEwYDVR0lBAwwCgYIKwYBBQUHAwgweQYIKwYBBQUHAQEEbTBrMCQG
# CCsGAQUFBzABhhhodHRwOi8vb2NzcC5kaWdpY2VydC5jb20wQwYIKwYBBQUHMAKG
# N2h0dHA6Ly9jYWNlcnRzLmRpZ2ljZXJ0LmNvbS9EaWdpQ2VydEFzc3VyZWRJRFJv
# b3RDQS5jcnQwgYEGA1UdHwR6MHgwOqA4oDaGNGh0dHA6Ly9jcmw0LmRpZ2ljZXJ0
# LmNvbS9EaWdpQ2VydEFzc3VyZWRJRFJvb3RDQS5jcmwwOqA4oDaGNGh0dHA6Ly9j
# cmwzLmRpZ2ljZXJ0LmNvbS9EaWdpQ2VydEFzc3VyZWRJRFJvb3RDQS5jcmwwUAYD
# VR0gBEkwRzA4BgpghkgBhv1sAAIEMCowKAYIKwYBBQUHAgEWHGh0dHBzOi8vd3d3
# LmRpZ2ljZXJ0LmNvbS9DUFMwCwYJYIZIAYb9bAcBMA0GCSqGSIb3DQEBCwUAA4IB
# AQBxlRLpUYdWac3v3dp8qmN6s3jPBjdAhO9LhL/KzwMC/cWnww4gQiyvd/MrHwwh
# Wiq3BTQdaq6Z+CeiZr8JqmDfdqQ6kw/4stHYfBli6F6CJR7Euhx7LCHi1lssFDVD
# BGiy23UC4HLHmNY8ZOUfSBAYX4k4YU1iRiSHY4yRUiyvKYnleB/WCxSlgNcSR3Cz
# ddWThZN+tpJn+1Nhiaj1a5bA9FhpDXzIAbG5KHW3mWOFIoxhynmUfln8jA/jb7UB
# JrZspe6HUSHkWGCbugwtK22ixH67xCUrRwIIfEmuE7bhfEJCKMYYVs9BNLZmXbZ0
# e/VWMyIvIjayS6JKldj1po5SMYIEXDCCBFgCAQEwgYYwcjELMAkGA1UEBhMCVVMx
# FTATBgNVBAoTDERpZ2lDZXJ0IEluYzEZMBcGA1UECxMQd3d3LmRpZ2ljZXJ0LmNv
# bTExMC8GA1UEAxMoRGlnaUNlcnQgU0hBMiBBc3N1cmVkIElEIENvZGUgU2lnbmlu
# ZyBDQQIQA8EEW12ZwP3HiJeAbIpT5zAJBgUrDgMCGgUAoHgwGAYKKwYBBAGCNwIB
# DDEKMAigAoAAoQKAADAZBgkqhkiG9w0BCQMxDAYKKwYBBAGCNwIBBDAcBgorBgEE
# AYI3AgELMQ4wDAYKKwYBBAGCNwIBFTAjBgkqhkiG9w0BCQQxFgQU40xTtfW6P1Kn
# x1ioz2f5DVczi1AwDQYJKoZIhvcNAQEBBQAEggEArxL12Nh7uAWBIgjIjLL/Cc19
# DyJlNNh48K78XRbsBAuJlHrmuBW8W33ZLk+jOEEpze4zPGzQVJuFK6+r4NcGuOhe
# tP6IYUShQmBYXv40vftsmuI9mFBsM8FBQD/3RPy8suxmd7iOntNbGOn23sNe+Vjc
# qBKu8CjCm6fEtRHsK5Y3WEnSTpIvjQaT1K12mr2RDiY6SFcr31Tf/R6bqr2v8wLO
# VF3erTLpTF+EbrWAry3TBMNjyPbUmWZb5Yaz+XEEdIx1dfV3Md4onXTcIScS+A4G
# BsowaLgXCjRvJ/RIx1MN/swoRGEqmjfm5IBWca612SZEE7lc0wY+T9MxAwiTpKGC
# AjAwggIsBgkqhkiG9w0BCQYxggIdMIICGQIBATCBhjByMQswCQYDVQQGEwJVUzEV
# MBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3d3cuZGlnaWNlcnQuY29t
# MTEwLwYDVQQDEyhEaWdpQ2VydCBTSEEyIEFzc3VyZWQgSUQgVGltZXN0YW1waW5n
# IENBAhANQkrgvjqI/2BAIc4UAPDdMA0GCWCGSAFlAwQCAQUAoGkwGAYJKoZIhvcN
# AQkDMQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUxDxcNMjEwNTI5MTIyODA5WjAv
# BgkqhkiG9w0BCQQxIgQgBT1uwYywi+4tskMpC9D81JPaWcrGB/iwrVfmtOiQAlYw
# DQYJKoZIhvcNAQEBBQAEggEAOMzRtqUGYWb9WYfBmkyfilQ190v1dRi9P4/JJoMF
# XpzhcGIxcGJfO5rXvpOhsRXAeHf+BhPkQiQJ3Y+svkcTAUYwuBpQJEj0H/569Vru
# O9BJtUP0+RxryhjUYnkLwLhox5qn3xuZ7pze5Mvc9rbt2KKInyqqDwJAbBFU90qe
# KphLpvhM9uEQjHRe1bJ62aYN10IXciYgsBAkMpMJRtZjkNt89TAc22Tmz/QXvJx+
# myDoT4IGMCjt4OyfVSzc847E4AVCWwe10dJnthOcLdcRBduv6M3SeBtpRkjz3sE9
# Kpy6/eo0MJlyzTN8yRL3yihAiMF2CiAV8gK5kSTw6AiQSQ==
# SIG # End signature block