$ErrorActionPreference = 'Stop'
. (Join-Path $PSScriptRoot 'env_build_number.ps1')

foreach ($newline in @("`n", "`r`n")) {
    foreach ($content in @('', 'BUILD_NUMBER=1', "# keep$newline`BUILD_NUMBER=1$newline`TOKEN=example=unchanged$newline`BUILD_NUMBER=2$newline", "export BUILD_NUMBER=3$newline`OTHER=value$newline")) {
        $result = Set-EnvBuildNumber -Content $content -BuildNumber '0803262237'
        if ([regex]::Matches($result, '(?m)^BUILD_NUMBER=').Count -ne 1) { throw 'Duplicate build numbers remain' }
        if ((Set-EnvBuildNumber -Content $result -BuildNumber '0803262237') -cne $result) { throw 'Update is not idempotent' }
        $expected = [regex]::Replace($content, '(?m)^(?:export )?BUILD_NUMBER=[^\r\n]*(?:\r?\n|$)', '')
        $actual = [regex]::Replace($result, '(?m)^BUILD_NUMBER=[^\r\n]*(?:\r?\n|$)', '')
        if ($actual -cne $expected) { throw 'Unrelated settings changed' }
    }
}
Write-Host 'Build-number tests passed: empty, existing, duplicates, LF/CRLF, preservation and repeat updates.'