tests/general/FileIntegrity.Tests.ps1

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$moduleRoot = (Resolve-Path "$global:testroot\..").Path

. "$global:testroot\general\FileIntegrity.Exceptions.ps1"

Describe "Verifying integrity of module files" {
    BeforeAll {
        function Get-FileEncoding {
            <#
            .SYNOPSIS
                Tests a file for encoding.
 
            .DESCRIPTION
                Tests a file for encoding.
 
            .PARAMETER Path
                The file to test
        #>

            [CmdletBinding()]
            Param (
                [Parameter(Mandatory = $True, ValueFromPipelineByPropertyName = $True)]
                [Alias('FullName')]
                [string]
                $Path
            )

            if ($PSVersionTable.PSVersion.Major -lt 6) {
                [byte[]]$byte = get-content -Encoding byte -ReadCount 4 -TotalCount 4 -Path $Path
            } else {
                [byte[]]$byte = Get-Content -AsByteStream -ReadCount 4 -TotalCount 4 -Path $Path
            }

            if ($byte[0] -eq 0xef -and $byte[1] -eq 0xbb -and $byte[2] -eq 0xbf) { 'UTF8 BOM' }
            elseif ($byte[0] -eq 0xfe -and $byte[1] -eq 0xff) { 'Unicode' }
            elseif ($byte[0] -eq 0 -and $byte[1] -eq 0 -and $byte[2] -eq 0xfe -and $byte[3] -eq 0xff) { 'UTF32' }
            elseif ($byte[0] -eq 0x2b -and $byte[1] -eq 0x2f -and $byte[2] -eq 0x76) { 'UTF7' }
            else { 'Unknown' }
        }
    }

    Context "Validating PS1 Script files" {
        $allFiles = Get-ChildItem -Path $moduleRoot -Recurse | Where-Object Name -like "*.ps1" | Where-Object FullName -NotLike "$moduleRoot\tests\*"

        foreach ($file in $allFiles) {
            $name = $file.FullName.Replace("$moduleRoot\", '')

            It "[$name] Should have UTF8 encoding with Byte Order Mark" -TestCases @{ file = $file } {
                Get-FileEncoding -Path $file.FullName | Should -Be 'UTF8 BOM'
            }

            It "[$name] Should have no trailing space" -TestCases @{ file = $file } {
                ($file | Select-String "\s$" | Where-Object { $_.Line.Trim().Length -gt 0 }).LineNumber | Should -BeNullOrEmpty
            }

            $tokens = $null
            $parseErrors = $null
            $ast = [System.Management.Automation.Language.Parser]::ParseFile($file.FullName, [ref]$tokens, [ref]$parseErrors)

            It "[$name] Should have no syntax errors" -TestCases @{ parseErrors = $parseErrors } {
                $parseErrors | Should -BeNullOrEmpty
            }

            foreach ($command in $global:BannedCommands) {
                if ($global:MayContainCommand["$command"] -notcontains $file.Name) {
                    It "[$name] Should not use $command" -TestCases @{ tokens = $tokens; command = $command } {
                        $tokens | Where-Object Text -EQ $command | Should -BeNullOrEmpty
                    }
                }
            }
        }
    }

    Context "Validating help.txt help files" {
        $allFiles = Get-ChildItem -Path $moduleRoot -Recurse | Where-Object Name -like "*.help.txt" | Where-Object FullName -NotLike "$moduleRoot\tests\*"

        foreach ($file in $allFiles) {
            $name = $file.FullName.Replace("$moduleRoot\", '')

            It "[$name] Should have UTF8 encoding" -TestCases @{ file = $file } {
                Get-FileEncoding -Path $file.FullName | Should -Be 'UTF8 BOM'
            }

            It "[$name] Should have no trailing space" -TestCases @{ file = $file } {
                ($file | Select-String "\s$" | Where-Object { $_.Line.Trim().Length -gt 0 } | Measure-Object).Count | Should -Be 0
            }
        }
    }
}