/usr/share/pyshared/traits/tests/test_interfaces.py is in python-traits 4.1.0-1.
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#
# Unit test case for testing interfaces and adaptation.
#
# Written by: David C. Morrill
#
# Date: 4/10/2007
#
# 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!
#
#-------------------------------------------------------------------------------
""" Unit test case for testing interfaces and adaptation.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
from __future__ import absolute_import
import unittest
from ..api import (HasTraits, Interface, Adapter, Instance, Int, List,
TraitError, AdaptedTo, adapts, implements)
#-------------------------------------------------------------------------------
# Test 'Interface' definitions:
#-------------------------------------------------------------------------------
class IFoo(Interface):
def get_foo(self):
""" Returns the current foo. """
class IFooPlus(IFoo):
def get_foo_plus(self):
""" Returns even more foo. """
class IAverage(Interface):
def get_average(self):
""" Returns the average value for the object. """
class IList(Interface):
def get_list(self):
""" Returns the list value for the object. """
#-------------------------------------------------------------------------------
# Test 'model' classes:
#-------------------------------------------------------------------------------
class Sample ( HasTraits ):
s1 = Int( 1, sample = True )
s2 = Int( 2, sample = True )
s3 = Int( 3, sample = True )
i1 = Int( 4 )
i2 = Int( 5 )
i3 = Int( 6 )
class SampleList ( HasTraits ):
implements( IList )
data = List( Int, [ 10, 20, 30 ] )
def get_list ( self ):
return self.data
class SampleAverage ( HasTraits ):
implements( IList, IAverage )
data = List( Int, [ 100, 200, 300 ] )
def get_list ( self ):
return self.data
def get_average ( self ):
value = self.get_list()
if len( value ) == 0:
return 0.0
average = 0.0
for item in value:
average += item
return (average / len( value ))
class SampleBad ( HasTraits ):
pass
#-------------------------------------------------------------------------------
# Test interfaces class:
#-------------------------------------------------------------------------------
class TraitsHolder ( HasTraits ):
a_no = Instance( IAverage, adapt = 'no' )
a_yes = Instance( IAverage, adapt = 'yes' )
a_default = Instance( IAverage, adapt = 'default' )
l_yes = AdaptedTo( IList )
f_yes = AdaptedTo( IFoo )
fp_yes = AdaptedTo( IFooPlus )
#-------------------------------------------------------------------------------
# Test 'adapter' definitions:
#-------------------------------------------------------------------------------
class SampleListAdapter ( Adapter ):
adapts( Sample, IList )
def get_list ( self ):
obj = self.adaptee
return [ getattr( obj, name )
for name in obj.trait_names( sample = True ) ]
class ListAverageAdapter ( Adapter ):
adapts( IList, IAverage )
def get_average ( self ):
value = self.adaptee.get_list()
if len( value ) == 0:
return 0.0
average = 0.0
for item in value:
average += item
return (average / len( value ))
class SampleFooAdapter ( HasTraits ):
adapts( Sample, IFoo )
object = Instance( Sample )
def __init__ ( self, object ):
self.object = object
def get_foo ( self ):
object = self.object
return (object.s1 + object.s2 + object.s3)
class FooPlusAdapter ( object ):
def __init__ ( self, obj ):
self.obj = obj
def get_foo ( self ):
return self.obj.get_foo()
def get_foo_plus ( self ):
return (self.obj.get_foo() + 1)
adapts( FooPlusAdapter, IFoo, IFooPlus )
#-------------------------------------------------------------------------------
# 'InterfacesTest' unit test class:
#-------------------------------------------------------------------------------
class InterfacesTest ( unittest.TestCase ):
#---------------------------------------------------------------------------
# Individual unit test methods:
#---------------------------------------------------------------------------
def test_implements_none ( self ):
class Test ( HasTraits ):
implements()
def test_implements_one ( self ):
class Test ( HasTraits ):
implements( IFoo )
def test_implements_multi ( self ):
class Test ( HasTraits ):
implements( IFoo, IAverage, IList )
def test_implements_extended ( self ):
""" Ensure that subclasses of Interfaces imply the superinterface.
"""
class Test ( HasTraits ):
implements( IFooPlus )
ta = TraitsHolder()
ta.f_yes = Test()
def test_implements_bad ( self ):
self.assertRaises( TraitError, self.implements_bad )
def test_instance_adapt_no ( self ):
ta = TraitsHolder()
# Verify that SampleAverage() does not raise an error (it is an instance
# of the IAverage interface).
try:
ta.a_no = SampleAverage()
except TraitError:
self.fail("Setting instance of interface should not require " \
"adaptation")
# These are not instances of the IAverage interface, and therefore
# cannot be set to the trait.
self.assertRaises( TraitError, ta.set, a_no = SampleList() )
self.assertRaises( TraitError, ta.set, a_no = Sample() )
self.assertRaises( TraitError, ta.set, a_no = SampleBad() )
def test_instance_adapt_yes ( self ):
ta = TraitsHolder()
ta.a_yes = object = SampleAverage()
self.assertEqual( ta.a_yes.get_average(), 200.0 )
self.assert_( isinstance( ta.a_yes, SampleAverage ) )
self.assertFalse( hasattr(ta, 'a_yes_') )
ta.a_yes = object = SampleList()
self.assertEqual( ta.a_yes.get_average(), 20.0 )
self.assert_( isinstance( ta.a_yes, ListAverageAdapter ) )
self.assertFalse( hasattr(ta, 'a_yes_') )
ta.l_yes = object = Sample()
result = ta.l_yes.get_list()
self.assertEqual( len( result ), 3 )
for n in [ 1, 2, 3 ]:
self.assert_( n in result )
self.assert_( isinstance( ta.l_yes, SampleListAdapter ) )
self.assertEqual( ta.l_yes_, object )
ta.a_yes = object = Sample()
self.assertEqual( ta.a_yes.get_average(), 2.0 )
self.assert_( isinstance( ta.a_yes, ListAverageAdapter ) )
self.assertFalse( hasattr(ta, 'a_yes_') )
self.assertRaises( TraitError, ta.set, a_yes = SampleBad() )
ta.f_yes = object = Sample()
self.assertEqual( ta.f_yes.get_foo(), 6 )
self.assert_( isinstance( ta.f_yes, SampleFooAdapter ) )
self.assertEqual( ta.f_yes_, object )
ta.fp_yes = object = Sample( s1 = 5, s2 = 10, s3 = 15 )
self.assertEqual( ta.fp_yes.get_foo(), 30 )
self.assertEqual( ta.fp_yes.get_foo_plus(), 31 )
self.assert_( isinstance( ta.fp_yes, FooPlusAdapter ) )
self.assertEqual( ta.fp_yes_, object )
def test_instance_adapt_default ( self ):
ta = TraitsHolder()
ta.a_default = object = SampleAverage()
self.assertEqual( ta.a_default.get_average(), 200.0 )
self.assert_( isinstance( ta.a_default, SampleAverage ) )
self.assertFalse( hasattr(ta, 'a_default_') )
ta.a_default = object = SampleList()
self.assertEqual( ta.a_default.get_average(), 20.0 )
self.assert_( isinstance( ta.a_default, ListAverageAdapter ) )
self.assertFalse( hasattr(ta, 'a_default_') )
ta.a_default = object = Sample()
self.assertEqual( ta.a_default.get_average(), 2.0 )
self.assert_( isinstance( ta.a_default, ListAverageAdapter ) )
self.assertFalse( hasattr(ta, 'a_default_') )
ta.a_default = object = SampleBad()
self.assertEqual( ta.a_default, None )
self.assertFalse( hasattr(ta, 'a_default_') )
#-- Helper Methods ---------------------------------------------------------
def implements_bad ( self ):
class Test ( HasTraits ):
implements( Sample )
# Run the unit tests (if invoked from the command line):
if __name__ == '__main__':
unittest.main()
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