old_contents: #! /usr/bin/env python
  # -*- coding: utf-8 -*-
  # vim:fenc=utf-8
  #
  # Copyright © 2014 uralbash <root@uralbash.ru>
  #
  # Distributed under terms of the MIT license.
  
  import colander
  import sqlalchemy
  from sqlalchemy import Column, String, Integer
  from sacrud_deform import SacrudForm
  from ps_alchemy.views import preprocessing_value
  from sqlalchemy.ext.declarative import declarative_base
  
  
  def test_preprocessing_value():
  
      Base = declarative_base()  # noqa
  
      class User(Base):
          __tablename__ = 'users'
          id = Column(Integer, primary_key=True)
          foo = Column(String)
          bar = Column(Integer)
  
      form = SacrudForm(None, None, User)
      form.make_appstruct()
      assert preprocessing_value("foo", colander.null, form.schema) == ""
      assert preprocessing_value("foo", "", form.schema) == ""
      assert isinstance(
          sqlalchemy.sql.null(),
          type(preprocessing_value("bar", "", form.schema))
      )
      value = {'foo': 'bar'}
      assert preprocessing_value("foo", value, form.schema) == value
  
      assert preprocessing_value("foo", "говядо", form.schema) == "говядо"
      assert preprocessing_value("foo", u"говядо", form.schema) == "говядо"
      assert preprocessing_value(
          "foo",
          u'\u0433\u043e\u0432\u044f\u0434\u043e', form.schema) == "говядо"
  
new_contents: #! /usr/bin/env python
  # -*- coding: utf-8 -*-
  # vim:fenc=utf-8
  #
  # Copyright © 2014 uralbash <root@uralbash.ru>
  #
  # Distributed under terms of the MIT license.
  
  import colander
  import sqlalchemy
  from sqlalchemy import Column, String, Integer
  from sacrud_deform import SacrudForm
  from ps_alchemy.views import preprocessing_value
  from sqlalchemy.ext.declarative import declarative_base
  
  
  def test_preprocessing_value():
  
      Base = declarative_base()  # noqa
  
      class User(Base):
          __tablename__ = 'users'
          id = Column(Integer, primary_key=True)
          foo = Column(String)
          bar = Column(Integer)
  
      form = SacrudForm(None, None, User)
      form.make_appstruct()
      assert preprocessing_value("foo", colander.null, form.schema) == ""
      assert preprocessing_value("foo", "", form.schema) == ""
      assert isinstance(
          sqlalchemy.sql.null(),
          type(preprocessing_value("bar", "", form.schema))
      )
      value = {'foo': 'bar'}
      assert preprocessing_value("foo", value, form.schema) == value
      assert preprocessing_value("foo", u"говядо", form.schema) == "говядо"
      assert preprocessing_value(
          "foo",
          u'\u0433\u043e\u0432\u044f\u0434\u043e', form.schema) == "говядо"
  
subject: fix test