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#!/usr/bin/env python
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# encoding: utf-8
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"""
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Tests for IPython.utils.traitlets.
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Authors:
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* Brian Granger
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* Enthought, Inc. Some of the code in this file comes from enthought.traits
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and is licensed under the BSD license. Also, many of the ideas also come
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from enthought.traits even though our implementation is very different.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2009 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import sys
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import os
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from unittest import TestCase
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from IPython.utils.traitlets import (
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HasTraitlets, MetaHasTraitlets, TraitletType, Any,
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Int, Long, Float, Complex, Str, Unicode, Bool, TraitletError
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)
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#-----------------------------------------------------------------------------
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# Helper classes for testing
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#-----------------------------------------------------------------------------
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class HasTraitletsStub(object):
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def __init__(self):
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self._traitlet_values = {}
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self._traitlet_notifiers = {}
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def _notify(self, name, old, new):
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self._notify_name = name
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self._notify_old = old
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self._notify_new = new
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#-----------------------------------------------------------------------------
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# Test classes
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#-----------------------------------------------------------------------------
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class TestTraitletType(TestCase):
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name = 'a'
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def setUp(self):
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self.tt = TraitletType()
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self.tt.name = self.name
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self.hast = HasTraitletsStub()
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def test_get(self):
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value = self.tt.__get__(self.hast)
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self.assertEquals(value, None)
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def test_set(self):
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self.tt.__set__(self.hast, 10)
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self.assertEquals(self.hast._traitlet_values[self.name],10)
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self.assertEquals(self.hast._notify_name,self.name)
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self.assertEquals(self.hast._notify_old,None)
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self.assertEquals(self.hast._notify_new,10)
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def test_validate(self):
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class MyTT(TraitletType):
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def validate(self, inst, value):
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return -1
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tt = MyTT()
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tt.name = self.name
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tt.__set__(self.hast, 10)
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self.assertEquals(tt.__get__(self.hast),-1)
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def test_is_valid_for(self):
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class MyTT(TraitletType):
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def is_valid_for(self, value):
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return True
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tt = MyTT()
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tt.name = self.name
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tt.__set__(self.hast, 10)
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self.assertEquals(tt.__get__(self.hast),10)
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def test_value_for(self):
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class MyTT(TraitletType):
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def value_for(self, value):
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return 20
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tt = MyTT()
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tt.name = self.name
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tt.__set__(self.hast, 10)
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self.assertEquals(tt.__get__(self.hast),20)
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def test_info(self):
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self.assertEquals(self.tt.info(),'any value')
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def test_error(self):
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self.assertRaises(TraitletError, self.tt.error, self.hast, 10)
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class TestHasTraitletsMeta(TestCase):
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def test_metaclass(self):
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self.assertEquals(type(HasTraitlets), MetaHasTraitlets)
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class A(HasTraitlets):
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a = Int
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a = A()
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self.assertEquals(type(a.__class__), MetaHasTraitlets)
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self.assertEquals(a.a,0)
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a.a = 10
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self.assertEquals(a.a,10)
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class B(HasTraitlets):
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b = Int()
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b = B()
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self.assertEquals(b.b,0)
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b.b = 10
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self.assertEquals(b.b,10)
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class C(HasTraitlets):
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c = Int(30)
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c = C()
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self.assertEquals(c.c,30)
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c.c = 10
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self.assertEquals(c.c,10)
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class TestHasTraitletsNotify(TestCase):
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def setUp(self):
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self._notify1 = []
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self._notify2 = []
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def notify1(self, name, old, new):
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self._notify1.append((name, old, new))
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def notify2(self, name, old, new):
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self._notify2.append((name, old, new))
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def test_notify_all(self):
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class A(HasTraitlets):
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a = Int
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b = Float
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a = A()
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a.on_traitlet_change(self.notify1)
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a.a = 0
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self.assertEquals(len(self._notify1),0)
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a.b = 0.0
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self.assertEquals(len(self._notify1),0)
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a.a = 10
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self.assert_(('a',0,10) in self._notify1)
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a.b = 10.0
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self.assert_(('b',0.0,10.0) in self._notify1)
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self.assertRaises(TraitletError,setattr,a,'a','bad string')
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self.assertRaises(TraitletError,setattr,a,'b','bad string')
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self._notify1 = []
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a.on_traitlet_change(self.notify1,remove=True)
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a.a = 20
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a.b = 20.0
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self.assertEquals(len(self._notify1),0)
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def test_notify_one(self):
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class A(HasTraitlets):
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a = Int
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b = Float
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a = A()
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a.on_traitlet_change(self.notify1, 'a')
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a.a = 0
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self.assertEquals(len(self._notify1),0)
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a.a = 10
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self.assert_(('a',0,10) in self._notify1)
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self.assertRaises(TraitletError,setattr,a,'a','bad string')
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def test_subclass(self):
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class A(HasTraitlets):
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a = Int
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class B(A):
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b = Float
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b = B()
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self.assertEquals(b.a,0)
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self.assertEquals(b.b,0.0)
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b.a = 100
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b.b = 100.0
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self.assertEquals(b.a,100)
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self.assertEquals(b.b,100.0)
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def test_notify_subclass(self):
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class A(HasTraitlets):
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a = Int
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class B(A):
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b = Float
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b = B()
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b.on_traitlet_change(self.notify1, 'a')
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b.on_traitlet_change(self.notify2, 'b')
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b.a = 0
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b.b = 0.0
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self.assertEquals(len(self._notify1),0)
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self.assertEquals(len(self._notify2),0)
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b.a = 10
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b.b = 10.0
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self.assert_(('a',0,10) in self._notify1)
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self.assert_(('b',0.0,10.0) in self._notify2)
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def test_static_notify(self):
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class A(HasTraitlets):
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a = Int
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_notify1 = []
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def _a_changed(self, name, old, new):
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self._notify1.append((name, old, new))
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a = A()
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a.a = 0
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self.assertEquals(len(a._notify1),0)
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a.a = 10
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self.assert_(('a',0,10) in a._notify1)
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class B(A):
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b = Float
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_notify2 = []
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def _b_changed(self, name, old, new):
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self._notify2.append((name, old, new))
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b = B()
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b.a = 10
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b.b = 10.0
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self.assert_(('a',0,10) in b._notify1)
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self.assert_(('b',0.0,10.0) in b._notify2)
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def test_notify_args(self):
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def callback0():
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self.cb = ()
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def callback1(name):
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self.cb = (name,)
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def callback2(name, new):
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self.cb = (name, new)
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def callback3(name, old, new):
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self.cb = (name, old, new)
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class A(HasTraitlets):
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a = Int
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a = A()
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a.on_traitlet_change(callback0, 'a')
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a.a = 10
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self.assertEquals(self.cb,())
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a.on_traitlet_change(callback0, 'a', remove=True)
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a.on_traitlet_change(callback1, 'a')
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a.a = 100
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self.assertEquals(self.cb,('a',))
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a.on_traitlet_change(callback1, 'a', remove=True)
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a.on_traitlet_change(callback2, 'a')
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a.a = 1000
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self.assertEquals(self.cb,('a',1000))
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a.on_traitlet_change(callback2, 'a', remove=True)
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a.on_traitlet_change(callback3, 'a')
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a.a = 10000
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self.assertEquals(self.cb,('a',1000,10000))
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a.on_traitlet_change(callback3, 'a', remove=True)
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self.assertEquals(len(a._traitlet_notifiers['a']),0)
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class TestAddTraitlet(TestCase):
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def test_add_float(self):
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class A(HasTraitlets):
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a = Int
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a = A()
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a.a = 10
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a._add_class_traitlet('b',Float)
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self.assertEquals(a.b,0.0)
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a.b = 10.0
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self.assertEquals(a.b,10.0)
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self.assertRaises(TraitletError, setattr, a, 'b', 'bad value')
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#-----------------------------------------------------------------------------
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# Tests for specific traitlet types
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#-----------------------------------------------------------------------------
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class TraitletTestBase(TestCase):
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def assign(self, value):
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self.obj.value = value
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def coerce(self, value):
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return value
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def test_good_values(self):
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if hasattr(self, '_good_values'):
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for value in self._good_values:
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self.assign(value)
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self.assertEquals(self.obj.value, self.coerce(value))
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def test_bad_values(self):
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if hasattr(self, '_bad_values'):
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for value in self._bad_values:
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self.assertRaises(TraitletError, self.assign, value)
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def test_default_value(self):
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if hasattr(self, '_default_value'):
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self.assertEquals(self._default_value, self.obj.value)
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class AnyTraitlet(HasTraitlets):
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value = Any
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class AnyTraitTest(TraitletTestBase):
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obj = AnyTraitlet()
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_default_value = None
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_good_values = [10.0, 'ten', u'ten', [10], {'ten': 10},(10,), None, 1j]
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_bad_values = []
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class IntTraitlet(HasTraitlets):
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value = Int(99)
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class TestInt(TraitletTestBase):
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obj = IntTraitlet()
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_default_value = 99
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_good_values = [10, -10]
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_bad_values = ['ten', u'ten', [10], {'ten': 10},(10,), None, 1j, 10L,
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-10L, 10.1, -10.1, '10L', '-10L', '10.1', '-10.1', u'10L',
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u'-10L', u'10.1', u'-10.1', '10', '-10', u'10', u'-10']
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class LongTraitlet(HasTraitlets):
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value = Long(99L)
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class TestLong(TraitletTestBase):
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obj = LongTraitlet()
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_default_value = 99L
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_good_values = [10, -10, 10L, -10L]
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_bad_values = ['ten', u'ten', [10], [10l], {'ten': 10},(10,),(10L,),
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None, 1j, 10.1, -10.1, '10', '-10', '10L', '-10L', '10.1',
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'-10.1', u'10', u'-10', u'10L', u'-10L', u'10.1',
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u'-10.1']
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class FloatTraitlet(HasTraitlets):
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value = Float(99.0)
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class TestFloat(TraitletTestBase):
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obj = FloatTraitlet()
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_default_value = 99.0
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_good_values = [10, -10, 10.1, -10.1]
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_bad_values = [10L, -10L, 'ten', u'ten', [10], {'ten': 10},(10,), None,
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1j, '10', '-10', '10L', '-10L', '10.1', '-10.1', u'10',
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u'-10', u'10L', u'-10L', u'10.1', u'-10.1']
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class ComplexTraitlet(HasTraitlets):
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value = Complex(99.0-99.0j)
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class TestComplex(TraitletTestBase):
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obj = ComplexTraitlet()
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_default_value = 99.0-99.0j
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_good_values = [10, -10, 10.1, -10.1, 10j, 10+10j, 10-10j,
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10.1j, 10.1+10.1j, 10.1-10.1j]
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_bad_values = [10L, -10L, u'10L', u'-10L', 'ten', [10], {'ten': 10},(10,), None]
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class StringTraitlet(HasTraitlets):
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value = Str('string')
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class TestString(TraitletTestBase):
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obj = StringTraitlet()
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_default_value = 'string'
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_good_values = ['10', '-10', '10L',
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'-10L', '10.1', '-10.1', 'string']
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_bad_values = [10, -10, 10L, -10L, 10.1, -10.1, 1j, [10],
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['ten'],{'ten': 10},(10,), None, u'string']
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class UnicodeTraitlet(HasTraitlets):
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value = Unicode(u'unicode')
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class TestUnicode(TraitletTestBase):
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obj = UnicodeTraitlet()
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_default_value = u'unicode'
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_good_values = ['10', '-10', '10L', '-10L', '10.1',
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'-10.1', '', u'', 'string', u'string', ]
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_bad_values = [10, -10, 10L, -10L, 10.1, -10.1, 1j,
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[10], ['ten'], [u'ten'], {'ten': 10},(10,), None]
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