tests/pester.ps1

param (
    [ValidateSet('None', 'Default', 'Passed', 'Failed', 'Pending', 'Skipped', 'Inconclusive', 'Describe', 'Context', 'Summary', 'Header', 'Fails', 'All')]
    [string]
    $Show = "None",

    [ValidateSet('Everything', 'Functions', 'General')]
    [string]
    $Run = "Everything",

    [string]
    $Filter = "*.Tests.ps1"
)

Write-PSFMessage -Level Host -Message "Starting Tests"

Write-PSFMessage -Level Host -Message "Importing Module"

Remove-Module PSModuleDevelopment -ErrorAction Ignore
Import-Module "$PSScriptRoot\..\PSModuleDevelopment.psd1"
Import-Module "$PSScriptRoot\..\PSModuleDevelopment.psm1" -Force

Write-PSFMessage -Level Host -Message "Creating test result folder"
$null = New-Item -Path "$PSScriptRoot\..\.." -Name TestResults -ItemType Directory -Force

$totalFailed = 0
$totalRun = 0

$testresults = @()

if ($Run -match "Everything|General") {
    Write-PSFMessage -Level Important -Message "Modules imported, proceeding with general tests"
    foreach ($file in (Get-ChildItem "$PSScriptRoot\general" -Filter $Filter)) {
        Write-PSFMessage -Level Significant -Message " Executing <c='em'>$($file.Name)</c>"
        $TestOuputFile = Join-Path "$PSScriptRoot\..\..\TestResults" "TEST-$($file.BaseName).xml"
        $results = Invoke-Pester -Script $file.FullName -Show $Show -PassThru -OutputFile $TestOuputFile -OutputFormat NUnitXml
        foreach ($result in $results) {
            $totalRun += $result.TotalCount
            $totalFailed += $result.FailedCount
            $result.TestResult | Where-Object { -not $_.Passed } | ForEach-Object {
                $name = $_.Name
                $testresults += [pscustomobject]@{
                    Describe = $_.Describe
                    Context  = $_.Context
                    Name     = "It $name"
                    Result   = $_.Result
                    Message  = $_.FailureMessage
                }
            }
        }
    }
}

if ($Run -match "Everything|Functions") {
    Write-PSFMessage -Level Important -Message "Proceeding with individual tests"
    foreach ($file in (Get-ChildItem "$PSScriptRoot\functions" -Recurse -File -Filter $Filter)) {
        Write-PSFMessage -Level Significant -Message " Executing $($file.Name)"
        $results = Invoke-Pester -Script $file.FullName -Show $Show -PassThru
        foreach ($result in $results) {
            $totalRun += $result.TotalCount
            $totalFailed += $result.FailedCount
            $result.TestResult | Where-Object { -not $_.Passed } | ForEach-Object {
                $name = $_.Name
                $testresults += [pscustomobject]@{
                    Describe = $_.Describe
                    Context  = $_.Context
                    Name     = "It $name"
                    Result   = $_.Result
                    Message  = $_.FailureMessage
                }
            }
        }
    }
}

$testresults | Sort-Object Describe, Context, Name, Result, Message | Format-List

if ($totalFailed -eq 0) { Write-PSFMessage -Level Critical -Message "All <c='em'>$totalRun</c> tests executed without a single failure!" }
else { Write-PSFMessage -Level Critical -Message "<c='em'>$totalFailed tests</c> out of <c='sub'>$totalRun</c> tests failed!" }

if ($totalFailed -gt 0) {
    throw "$totalFailed / $totalRun tests failed!"
}