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from flask import render_template_string
from flask_wtf import FlaskForm
from wtforms import HiddenField, SubmitField
from wtforms.validators import DataRequired
def test_render_hidden_errors(app, client):
class TestForm(FlaskForm):
hide = HiddenField('Hide', validators=[DataRequired('Hide field is empty.')])
submit = SubmitField()
@app.route('/error', methods=['GET', 'POST'])
def error():
form = TestForm()
if form.validate_on_submit():
pass
return render_template_string('''
{% from 'bootstrap4/form.html' import render_field, render_hidden_errors %}
<form method="post">
{{ form.hidden_tag() }}
{{ render_hidden_errors(form) }}
{{ render_field(form.submit) }}
</form>
''', form=form)
response = client.post('/error', follow_redirects=True)
data = response.get_data(as_text=True)
assert 'Hide field is empty.' in data
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