#------------------------------------------------------------------------------
#
#  Copyright (c) 2007, Enthought, Inc.
#  All rights reserved.
#
#  This software is provided without warranty under the terms of the BSD
#  license included in /LICENSE.txt and may be redistributed only
#  under the conditions described in the aforementioned license.  The license
#  is also available online at http://www.enthought.com/licenses/BSD.txt
#
#  Thanks for using Enthought open source!
#
#------------------------------------------------------------------------------



from traits.testing.unittest_tools import unittest

from ..api import HasTraits, Str, Undefined, ReadOnly, Float


class Foo(HasTraits):
    name = Str()
    original_name = ReadOnly

    bar = Str
    baz = Float

    def _name_changed(self):
        if self.original_name is Undefined:
            self.original_name = self.name


class Bar(HasTraits):
    name = Str(Undefined)


class UndefinedTestCase(unittest.TestCase):
    def test_initial_value(self):
        b = Bar()
        self.assertEqual(b.name, Undefined)
        return

    def test_name_change(self):
        b = Bar()
        b.name = 'first'
        self.assertEqual(b.name, 'first')
        return

    def test_read_only_write_once(self):
        f = Foo()

        self.assertEqual(f.name, '')
        self.assertIs(f.original_name, Undefined)

        f.name = 'first'
        self.assertEqual(f.name, 'first')
        self.assertEqual(f.original_name, 'first')

        f.name = 'second'
        self.assertEqual(f.name, 'second')
        self.assertEqual(f.original_name, 'first')

        return

    def test_read_only_write_once_from_constructor(self):
        f = Foo(name='first')

        f.name = 'first'
        self.assertEqual(f.name, 'first')
        self.assertEqual(f.original_name, 'first')

        f.name = 'second'
        self.assertEqual(f.name, 'second')
        self.assertEqual(f.original_name, 'first')

        return

### EOF #######################################################################
