api/services/nginx/app/tests/auth/StripeInvoiceEmailTemplateTest.php

<?php
namespace {
    if (!defined('WD')) {
        define('WD', dirname(__DIR__, 2));
    }
}

namespace {
    require_once WD . '/modules/email/helpers/email_template.php';
    require_once WD . '/modules/email/templates/email_template_stripe_invoice.php';

    function assert_true(bool $condition, string $message): void
    {
        if (!$condition) {
            throw new \RuntimeException($message);
        }
    }

    function cleanup_buffers_to(int $base_level): string
    {
        $output = '';
        while (ob_get_level() > $base_level) {
            $output .= (string)ob_get_clean();
        }

        return $output;
    }

    $base_level = ob_get_level();
    ob_start();

    try {
        $html = (new \email\templates\email_template_stripe_invoice(
            4242,
            'https://pay.example.com/invoice/abc',
            'Anders And'
        ))->generate_html();
        $leaked_output = cleanup_buffers_to($base_level);

        assert_true($leaked_output === '', 'Template generation must not leak buffered HTML output.');

        // TRU-71: user-facing wording must not mention the payment processor
        // by name. The email body must describe the artefact in plain
        // language instead.
        assert_true(
            stripos($html, 'stripe') === false,
            'Stripe-invoice email body must no longer expose the payment processor name "Stripe" to the customer.'
        );

        assert_true(
            str_contains($html, 'betalingslink'),
            'Stripe-invoice email body must describe the artefact as a betalingslink (payment link).'
        );

        assert_true(
            str_contains($html, 'Kære Anders And'),
            'Template must still greet the customer by name.'
        );

        assert_true(
            str_contains($html, 'Betal faktura for ordre 4242'),
            'Template must still expose a pay-now action link for the order.'
        );
    } catch (\Throwable $exception) {
        $leaked_output = cleanup_buffers_to($base_level);
        fwrite(STDERR, $leaked_output);
        fwrite(STDERR, $exception->getMessage() . PHP_EOL);
        exit(1);
    }

    echo "\033[32m[PASS]\033[0m Stripe-invoice email template no longer mentions Stripe to the customer.\n";
    exit(0);
}