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-Host "Starting Tests" -ForegroundColor Green
if ($env:BUILD_BUILDURI -like "vstfs*")
{
    Write-Host "Installing Pester" -ForegroundColor Cyan
    Install-Module Pester -Force -SkipPublisherCheck
}

if ($env:BUILD_BUILDURI -like "vstfs*")
{
    Write-Host "Installing PSFramework" -ForegroundColor Cyan
    Install-Module PSFramework -Force -SkipPublisherCheck
}

Write-Host "Importing Module" -ForegroundColor Cyan

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

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!"
}