Test page script

testpage.twig

{% macro errorList(errors) %}
    {% if errors %}
        <ul class="errors">
            {% for error in errors %}
                <li>{{ error }}</li>
            {% endfor %}
        </ul>
    {% endif %}
{% endmacro %}

{% from _self import errorList %}

<form method="post" accept-charset="UTF-8" enctype="multipart/form-data">
    {{ csrfInput() }}
    <input type="hidden" name="action" value="guest-entries/save">
    <input type="hidden" name="sectionId" value="2">
    <input type="hidden" name="enabled" value="1">
    {{ redirectInput('{uri}') }}

    <label for="title">Title</label>
    <input id="title" type="text" name="title"
        {%- if entry is defined %} value="{{ entry.title }}"{% endif -%}>

    {% if entry is defined %}
        {{ errorList(entry.getErrors('title')) }}
    {% endif %}

    <input type="file" name="fields[asset]">
    <input type="submit" value="Publish">
</form>