text: from onegov.quill.validators import HtmlDataRequired
  from pytest import raises
  from wtforms.validators import ValidationError
  
  
  def test_html_data_validator(session):
  
      class Field(object):
          def __init__(self, data):
              self.data = data
  
          def gettext(self, text):
              return text
  
      validator = HtmlDataRequired()
  
      validator(None, Field('Test'))
      validator(None, Field('<p>Test</p>'))
  
      with raises(ValidationError):
          validator(None, Field(None))
      with raises(ValidationError):
          validator(None, Field(''))
      with raises(ValidationError):
          validator(None, Field(' '))
      with raises(ValidationError):
          validator(None, Field('<p></p>'))
      with raises(ValidationError):
          validator(None, Field('<p> </p>'))
      with raises(ValidationError):
          validator(None, Field('<p><br></p>'))
      with raises(ValidationError):
          validator(None, Field('<br><br><br><br>'))
  