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test_traitlets.py
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test_traitlets.py
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# encoding: utf-8
"""Tests for IPython.utils.traitlets."""
# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
#
# Adapted from enthought.traits, Copyright (c) Enthought, Inc.,
# also under the terms of the Modified BSD License.
import pickle
import re
import sys
from unittest import TestCase
import nose.tools as nt
from nose import SkipTest
from IPython.utils.traitlets import (
HasTraits, MetaHasTraits, TraitType, Any, CBytes, Dict,
Int, Long, Integer, Float, Complex, Bytes, Unicode, TraitError,
Undefined, Type, This, Instance, TCPAddress, List, Tuple,
ObjectName, DottedObjectName, CRegExp, link, directional_link,
EventfulList, EventfulDict
)
from IPython.utils import py3compat
from IPython.testing.decorators import skipif
#-----------------------------------------------------------------------------
# Helper classes for testing
#-----------------------------------------------------------------------------
class HasTraitsStub(HasTraits):
def _notify_trait(self, name, old, new):
self._notify_name = name
self._notify_old = old
self._notify_new = new
#-----------------------------------------------------------------------------
# Test classes
#-----------------------------------------------------------------------------
class TestTraitType(TestCase):
def test_get_undefined(self):
class A(HasTraits):
a = TraitType
a = A()
self.assertEqual(a.a, Undefined)
def test_set(self):
class A(HasTraitsStub):
a = TraitType
a = A()
a.a = 10
self.assertEqual(a.a, 10)
self.assertEqual(a._notify_name, 'a')
self.assertEqual(a._notify_old, Undefined)
self.assertEqual(a._notify_new, 10)
def test_validate(self):
class MyTT(TraitType):
def validate(self, inst, value):
return -1
class A(HasTraitsStub):
tt = MyTT
a = A()
a.tt = 10
self.assertEqual(a.tt, -1)
def test_default_validate(self):
class MyIntTT(TraitType):
def validate(self, obj, value):
if isinstance(value, int):
return value
self.error(obj, value)
class A(HasTraits):
tt = MyIntTT(10)
a = A()
self.assertEqual(a.tt, 10)
# Defaults are validated when the HasTraits is instantiated
class B(HasTraits):
tt = MyIntTT('bad default')
self.assertRaises(TraitError, B)
def test_is_valid_for(self):
class MyTT(TraitType):
def is_valid_for(self, value):
return True
class A(HasTraits):
tt = MyTT
a = A()
a.tt = 10
self.assertEqual(a.tt, 10)
def test_value_for(self):
class MyTT(TraitType):
def value_for(self, value):
return 20
class A(HasTraits):
tt = MyTT
a = A()
a.tt = 10
self.assertEqual(a.tt, 20)
def test_info(self):
class A(HasTraits):
tt = TraitType
a = A()
self.assertEqual(A.tt.info(), 'any value')
def test_error(self):
class A(HasTraits):
tt = TraitType
a = A()
self.assertRaises(TraitError, A.tt.error, a, 10)
def test_dynamic_initializer(self):
class A(HasTraits):
x = Int(10)
def _x_default(self):
return 11
class B(A):
x = Int(20)
class C(A):
def _x_default(self):
return 21
a = A()
self.assertEqual(a._trait_values, {})
self.assertEqual(list(a._trait_dyn_inits.keys()), ['x'])
self.assertEqual(a.x, 11)
self.assertEqual(a._trait_values, {'x': 11})
b = B()
self.assertEqual(b._trait_values, {'x': 20})
self.assertEqual(list(a._trait_dyn_inits.keys()), ['x'])
self.assertEqual(b.x, 20)
c = C()
self.assertEqual(c._trait_values, {})
self.assertEqual(list(a._trait_dyn_inits.keys()), ['x'])
self.assertEqual(c.x, 21)
self.assertEqual(c._trait_values, {'x': 21})
# Ensure that the base class remains unmolested when the _default
# initializer gets overridden in a subclass.
a = A()
c = C()
self.assertEqual(a._trait_values, {})
self.assertEqual(list(a._trait_dyn_inits.keys()), ['x'])
self.assertEqual(a.x, 11)
self.assertEqual(a._trait_values, {'x': 11})
class TestHasTraitsMeta(TestCase):
def test_metaclass(self):
self.assertEqual(type(HasTraits), MetaHasTraits)
class A(HasTraits):
a = Int
a = A()
self.assertEqual(type(a.__class__), MetaHasTraits)
self.assertEqual(a.a,0)
a.a = 10
self.assertEqual(a.a,10)
class B(HasTraits):
b = Int()
b = B()
self.assertEqual(b.b,0)
b.b = 10
self.assertEqual(b.b,10)
class C(HasTraits):
c = Int(30)
c = C()
self.assertEqual(c.c,30)
c.c = 10
self.assertEqual(c.c,10)
def test_this_class(self):
class A(HasTraits):
t = This()
tt = This()
class B(A):
tt = This()
ttt = This()
self.assertEqual(A.t.this_class, A)
self.assertEqual(B.t.this_class, A)
self.assertEqual(B.tt.this_class, B)
self.assertEqual(B.ttt.this_class, B)
class TestHasTraitsNotify(TestCase):
def setUp(self):
self._notify1 = []
self._notify2 = []
def notify1(self, name, old, new):
self._notify1.append((name, old, new))
def notify2(self, name, old, new):
self._notify2.append((name, old, new))
def test_notify_all(self):
class A(HasTraits):
a = Int
b = Float
a = A()
a.on_trait_change(self.notify1)
a.a = 0
self.assertEqual(len(self._notify1),0)
a.b = 0.0
self.assertEqual(len(self._notify1),0)
a.a = 10
self.assertTrue(('a',0,10) in self._notify1)
a.b = 10.0
self.assertTrue(('b',0.0,10.0) in self._notify1)
self.assertRaises(TraitError,setattr,a,'a','bad string')
self.assertRaises(TraitError,setattr,a,'b','bad string')
self._notify1 = []
a.on_trait_change(self.notify1,remove=True)
a.a = 20
a.b = 20.0
self.assertEqual(len(self._notify1),0)
def test_notify_one(self):
class A(HasTraits):
a = Int
b = Float
a = A()
a.on_trait_change(self.notify1, 'a')
a.a = 0
self.assertEqual(len(self._notify1),0)
a.a = 10
self.assertTrue(('a',0,10) in self._notify1)
self.assertRaises(TraitError,setattr,a,'a','bad string')
def test_subclass(self):
class A(HasTraits):
a = Int
class B(A):
b = Float
b = B()
self.assertEqual(b.a,0)
self.assertEqual(b.b,0.0)
b.a = 100
b.b = 100.0
self.assertEqual(b.a,100)
self.assertEqual(b.b,100.0)
def test_notify_subclass(self):
class A(HasTraits):
a = Int
class B(A):
b = Float
b = B()
b.on_trait_change(self.notify1, 'a')
b.on_trait_change(self.notify2, 'b')
b.a = 0
b.b = 0.0
self.assertEqual(len(self._notify1),0)
self.assertEqual(len(self._notify2),0)
b.a = 10
b.b = 10.0
self.assertTrue(('a',0,10) in self._notify1)
self.assertTrue(('b',0.0,10.0) in self._notify2)
def test_static_notify(self):
class A(HasTraits):
a = Int
_notify1 = []
def _a_changed(self, name, old, new):
self._notify1.append((name, old, new))
a = A()
a.a = 0
# This is broken!!!
self.assertEqual(len(a._notify1),0)
a.a = 10
self.assertTrue(('a',0,10) in a._notify1)
class B(A):
b = Float
_notify2 = []
def _b_changed(self, name, old, new):
self._notify2.append((name, old, new))
b = B()
b.a = 10
b.b = 10.0
self.assertTrue(('a',0,10) in b._notify1)
self.assertTrue(('b',0.0,10.0) in b._notify2)
def test_notify_args(self):
def callback0():
self.cb = ()
def callback1(name):
self.cb = (name,)
def callback2(name, new):
self.cb = (name, new)
def callback3(name, old, new):
self.cb = (name, old, new)
class A(HasTraits):
a = Int
a = A()
a.on_trait_change(callback0, 'a')
a.a = 10
self.assertEqual(self.cb,())
a.on_trait_change(callback0, 'a', remove=True)
a.on_trait_change(callback1, 'a')
a.a = 100
self.assertEqual(self.cb,('a',))
a.on_trait_change(callback1, 'a', remove=True)
a.on_trait_change(callback2, 'a')
a.a = 1000
self.assertEqual(self.cb,('a',1000))
a.on_trait_change(callback2, 'a', remove=True)
a.on_trait_change(callback3, 'a')
a.a = 10000
self.assertEqual(self.cb,('a',1000,10000))
a.on_trait_change(callback3, 'a', remove=True)
self.assertEqual(len(a._trait_notifiers['a']),0)
def test_notify_only_once(self):
class A(HasTraits):
listen_to = ['a']
a = Int(0)
b = 0
def __init__(self, **kwargs):
super(A, self).__init__(**kwargs)
self.on_trait_change(self.listener1, ['a'])
def listener1(self, name, old, new):
self.b += 1
class B(A):
c = 0
d = 0
def __init__(self, **kwargs):
super(B, self).__init__(**kwargs)
self.on_trait_change(self.listener2)
def listener2(self, name, old, new):
self.c += 1
def _a_changed(self, name, old, new):
self.d += 1
b = B()
b.a += 1
self.assertEqual(b.b, b.c)
self.assertEqual(b.b, b.d)
b.a += 1
self.assertEqual(b.b, b.c)
self.assertEqual(b.b, b.d)
class TestHasTraits(TestCase):
def test_trait_names(self):
class A(HasTraits):
i = Int
f = Float
a = A()
self.assertEqual(sorted(a.trait_names()),['f','i'])
self.assertEqual(sorted(A.class_trait_names()),['f','i'])
def test_trait_metadata(self):
class A(HasTraits):
i = Int(config_key='MY_VALUE')
a = A()
self.assertEqual(a.trait_metadata('i','config_key'), 'MY_VALUE')
def test_trait_metadata_default(self):
class A(HasTraits):
i = Int()
a = A()
self.assertEqual(a.trait_metadata('i', 'config_key'), None)
self.assertEqual(a.trait_metadata('i', 'config_key', 'default'), 'default')
def test_traits(self):
class A(HasTraits):
i = Int
f = Float
a = A()
self.assertEqual(a.traits(), dict(i=A.i, f=A.f))
self.assertEqual(A.class_traits(), dict(i=A.i, f=A.f))
def test_traits_metadata(self):
class A(HasTraits):
i = Int(config_key='VALUE1', other_thing='VALUE2')
f = Float(config_key='VALUE3', other_thing='VALUE2')
j = Int(0)
a = A()
self.assertEqual(a.traits(), dict(i=A.i, f=A.f, j=A.j))
traits = a.traits(config_key='VALUE1', other_thing='VALUE2')
self.assertEqual(traits, dict(i=A.i))
# This passes, but it shouldn't because I am replicating a bug in
# traits.
traits = a.traits(config_key=lambda v: True)
self.assertEqual(traits, dict(i=A.i, f=A.f, j=A.j))
def test_init(self):
class A(HasTraits):
i = Int()
x = Float()
a = A(i=1, x=10.0)
self.assertEqual(a.i, 1)
self.assertEqual(a.x, 10.0)
def test_positional_args(self):
class A(HasTraits):
i = Int(0)
def __init__(self, i):
super(A, self).__init__()
self.i = i
a = A(5)
self.assertEqual(a.i, 5)
# should raise TypeError if no positional arg given
self.assertRaises(TypeError, A)
#-----------------------------------------------------------------------------
# Tests for specific trait types
#-----------------------------------------------------------------------------
class TestType(TestCase):
def test_default(self):
class B(object): pass
class A(HasTraits):
klass = Type
a = A()
self.assertEqual(a.klass, None)
a.klass = B
self.assertEqual(a.klass, B)
self.assertRaises(TraitError, setattr, a, 'klass', 10)
def test_value(self):
class B(object): pass
class C(object): pass
class A(HasTraits):
klass = Type(B)
a = A()
self.assertEqual(a.klass, B)
self.assertRaises(TraitError, setattr, a, 'klass', C)
self.assertRaises(TraitError, setattr, a, 'klass', object)
a.klass = B
def test_allow_none(self):
class B(object): pass
class C(B): pass
class A(HasTraits):
klass = Type(B, allow_none=False)
a = A()
self.assertEqual(a.klass, B)
self.assertRaises(TraitError, setattr, a, 'klass', None)
a.klass = C
self.assertEqual(a.klass, C)
def test_validate_klass(self):
class A(HasTraits):
klass = Type('no strings allowed')
self.assertRaises(ImportError, A)
class A(HasTraits):
klass = Type('rub.adub.Duck')
self.assertRaises(ImportError, A)
def test_validate_default(self):
class B(object): pass
class A(HasTraits):
klass = Type('bad default', B)
self.assertRaises(ImportError, A)
class C(HasTraits):
klass = Type(None, B, allow_none=False)
self.assertRaises(TraitError, C)
def test_str_klass(self):
class A(HasTraits):
klass = Type('IPython.utils.ipstruct.Struct')
from IPython.utils.ipstruct import Struct
a = A()
a.klass = Struct
self.assertEqual(a.klass, Struct)
self.assertRaises(TraitError, setattr, a, 'klass', 10)
def test_set_str_klass(self):
class A(HasTraits):
klass = Type()
a = A(klass='IPython.utils.ipstruct.Struct')
from IPython.utils.ipstruct import Struct
self.assertEqual(a.klass, Struct)
class TestInstance(TestCase):
def test_basic(self):
class Foo(object): pass
class Bar(Foo): pass
class Bah(object): pass
class A(HasTraits):
inst = Instance(Foo)
a = A()
self.assertTrue(a.inst is None)
a.inst = Foo()
self.assertTrue(isinstance(a.inst, Foo))
a.inst = Bar()
self.assertTrue(isinstance(a.inst, Foo))
self.assertRaises(TraitError, setattr, a, 'inst', Foo)
self.assertRaises(TraitError, setattr, a, 'inst', Bar)
self.assertRaises(TraitError, setattr, a, 'inst', Bah())
def test_default_klass(self):
class Foo(object): pass
class Bar(Foo): pass
class Bah(object): pass
class FooInstance(Instance):
klass = Foo
class A(HasTraits):
inst = FooInstance()
a = A()
self.assertTrue(a.inst is None)
a.inst = Foo()
self.assertTrue(isinstance(a.inst, Foo))
a.inst = Bar()
self.assertTrue(isinstance(a.inst, Foo))
self.assertRaises(TraitError, setattr, a, 'inst', Foo)
self.assertRaises(TraitError, setattr, a, 'inst', Bar)
self.assertRaises(TraitError, setattr, a, 'inst', Bah())
def test_unique_default_value(self):
class Foo(object): pass
class A(HasTraits):
inst = Instance(Foo,(),{})
a = A()
b = A()
self.assertTrue(a.inst is not b.inst)
def test_args_kw(self):
class Foo(object):
def __init__(self, c): self.c = c
class Bar(object): pass
class Bah(object):
def __init__(self, c, d):
self.c = c; self.d = d
class A(HasTraits):
inst = Instance(Foo, (10,))
a = A()
self.assertEqual(a.inst.c, 10)
class B(HasTraits):
inst = Instance(Bah, args=(10,), kw=dict(d=20))
b = B()
self.assertEqual(b.inst.c, 10)
self.assertEqual(b.inst.d, 20)
class C(HasTraits):
inst = Instance(Foo)
c = C()
self.assertTrue(c.inst is None)
def test_bad_default(self):
class Foo(object): pass
class A(HasTraits):
inst = Instance(Foo, allow_none=False)
self.assertRaises(TraitError, A)
def test_instance(self):
class Foo(object): pass
def inner():
class A(HasTraits):
inst = Instance(Foo())
self.assertRaises(TraitError, inner)
class TestThis(TestCase):
def test_this_class(self):
class Foo(HasTraits):
this = This
f = Foo()
self.assertEqual(f.this, None)
g = Foo()
f.this = g
self.assertEqual(f.this, g)
self.assertRaises(TraitError, setattr, f, 'this', 10)
def test_this_inst(self):
class Foo(HasTraits):
this = This()
f = Foo()
f.this = Foo()
self.assertTrue(isinstance(f.this, Foo))
def test_subclass(self):
class Foo(HasTraits):
t = This()
class Bar(Foo):
pass
f = Foo()
b = Bar()
f.t = b
b.t = f
self.assertEqual(f.t, b)
self.assertEqual(b.t, f)
def test_subclass_override(self):
class Foo(HasTraits):
t = This()
class Bar(Foo):
t = This()
f = Foo()
b = Bar()
f.t = b
self.assertEqual(f.t, b)
self.assertRaises(TraitError, setattr, b, 't', f)
class TraitTestBase(TestCase):
"""A best testing class for basic trait types."""
def assign(self, value):
self.obj.value = value
def coerce(self, value):
return value
def test_good_values(self):
if hasattr(self, '_good_values'):
for value in self._good_values:
self.assign(value)
self.assertEqual(self.obj.value, self.coerce(value))
def test_bad_values(self):
if hasattr(self, '_bad_values'):
for value in self._bad_values:
try:
self.assertRaises(TraitError, self.assign, value)
except AssertionError:
assert False, value
def test_default_value(self):
if hasattr(self, '_default_value'):
self.assertEqual(self._default_value, self.obj.value)
def test_allow_none(self):
if (hasattr(self, '_bad_values') and hasattr(self, '_good_values') and
None in self._bad_values):
trait=self.obj.traits()['value']
try:
trait.allow_none = True
self._bad_values.remove(None)
#skip coerce. Allow None casts None to None.
self.assign(None)
self.assertEqual(self.obj.value,None)
self.test_good_values()
self.test_bad_values()
finally:
#tear down
trait.allow_none = False
self._bad_values.append(None)
def tearDown(self):
# restore default value after tests, if set
if hasattr(self, '_default_value'):
self.obj.value = self._default_value
class AnyTrait(HasTraits):
value = Any
class AnyTraitTest(TraitTestBase):
obj = AnyTrait()
_default_value = None
_good_values = [10.0, 'ten', u'ten', [10], {'ten': 10},(10,), None, 1j]
_bad_values = []
class IntTrait(HasTraits):
value = Int(99)
class TestInt(TraitTestBase):
obj = IntTrait()
_default_value = 99
_good_values = [10, -10]
_bad_values = ['ten', u'ten', [10], {'ten': 10},(10,), None, 1j,
10.1, -10.1, '10L', '-10L', '10.1', '-10.1', u'10L',
u'-10L', u'10.1', u'-10.1', '10', '-10', u'10', u'-10']
if not py3compat.PY3:
_bad_values.extend([long(10), long(-10), 10*sys.maxint, -10*sys.maxint])
class LongTrait(HasTraits):
value = Long(99 if py3compat.PY3 else long(99))
class TestLong(TraitTestBase):
obj = LongTrait()
_default_value = 99 if py3compat.PY3 else long(99)
_good_values = [10, -10]
_bad_values = ['ten', u'ten', [10], {'ten': 10},(10,),
None, 1j, 10.1, -10.1, '10', '-10', '10L', '-10L', '10.1',
'-10.1', u'10', u'-10', u'10L', u'-10L', u'10.1',
u'-10.1']
if not py3compat.PY3:
# maxint undefined on py3, because int == long
_good_values.extend([long(10), long(-10), 10*sys.maxint, -10*sys.maxint])
_bad_values.extend([[long(10)], (long(10),)])
@skipif(py3compat.PY3, "not relevant on py3")
def test_cast_small(self):
"""Long casts ints to long"""
self.obj.value = 10
self.assertEqual(type(self.obj.value), long)
class IntegerTrait(HasTraits):
value = Integer(1)
class TestInteger(TestLong):
obj = IntegerTrait()
_default_value = 1
def coerce(self, n):
return int(n)
@skipif(py3compat.PY3, "not relevant on py3")
def test_cast_small(self):
"""Integer casts small longs to int"""
if py3compat.PY3:
raise SkipTest("not relevant on py3")
self.obj.value = long(100)
self.assertEqual(type(self.obj.value), int)
class FloatTrait(HasTraits):
value = Float(99.0)
class TestFloat(TraitTestBase):
obj = FloatTrait()
_default_value = 99.0
_good_values = [10, -10, 10.1, -10.1]
_bad_values = ['ten', u'ten', [10], {'ten': 10},(10,), None,
1j, '10', '-10', '10L', '-10L', '10.1', '-10.1', u'10',
u'-10', u'10L', u'-10L', u'10.1', u'-10.1']
if not py3compat.PY3:
_bad_values.extend([long(10), long(-10)])
class ComplexTrait(HasTraits):
value = Complex(99.0-99.0j)
class TestComplex(TraitTestBase):
obj = ComplexTrait()
_default_value = 99.0-99.0j
_good_values = [10, -10, 10.1, -10.1, 10j, 10+10j, 10-10j,
10.1j, 10.1+10.1j, 10.1-10.1j]
_bad_values = [u'10L', u'-10L', 'ten', [10], {'ten': 10},(10,), None]
if not py3compat.PY3:
_bad_values.extend([long(10), long(-10)])
class BytesTrait(HasTraits):
value = Bytes(b'string')
class TestBytes(TraitTestBase):
obj = BytesTrait()
_default_value = b'string'
_good_values = [b'10', b'-10', b'10L',
b'-10L', b'10.1', b'-10.1', b'string']
_bad_values = [10, -10, 10.1, -10.1, 1j, [10],
['ten'],{'ten': 10},(10,), None, u'string']
if not py3compat.PY3:
_bad_values.extend([long(10), long(-10)])
class UnicodeTrait(HasTraits):
value = Unicode(u'unicode')
class TestUnicode(TraitTestBase):
obj = UnicodeTrait()
_default_value = u'unicode'
_good_values = ['10', '-10', '10L', '-10L', '10.1',
'-10.1', '', u'', 'string', u'string', u"€"]
_bad_values = [10, -10, 10.1, -10.1, 1j,
[10], ['ten'], [u'ten'], {'ten': 10},(10,), None]
if not py3compat.PY3:
_bad_values.extend([long(10), long(-10)])
class ObjectNameTrait(HasTraits):
value = ObjectName("abc")
class TestObjectName(TraitTestBase):
obj = ObjectNameTrait()
_default_value = "abc"
_good_values = ["a", "gh", "g9", "g_", "_G", u"a345_"]
_bad_values = [1, "", u"€", "9g", "!", "#abc", "aj@", "a.b", "a()", "a[0]",
None, object(), object]
if sys.version_info[0] < 3:
_bad_values.append(u"þ")
else:
_good_values.append(u"þ") # þ=1 is valid in Python 3 (PEP 3131).
class DottedObjectNameTrait(HasTraits):
value = DottedObjectName("a.b")
class TestDottedObjectName(TraitTestBase):
obj = DottedObjectNameTrait()
_default_value = "a.b"
_good_values = ["A", "y.t", "y765.__repr__", "os.path.join", u"os.path.join"]
_bad_values = [1, u"abc.€", "_.@", ".", ".abc", "abc.", ".abc.", None]
if sys.version_info[0] < 3:
_bad_values.append(u"t.þ")
else:
_good_values.append(u"t.þ")
class TCPAddressTrait(HasTraits):
value = TCPAddress()
class TestTCPAddress(TraitTestBase):
obj = TCPAddressTrait()
_default_value = ('127.0.0.1',0)
_good_values = [('localhost',0),('192.168.0.1',1000),('www.google.com',80)]
_bad_values = [(0,0),('localhost',10.0),('localhost',-1), None]
class ListTrait(HasTraits):
value = List(Int)
class TestList(TraitTestBase):
obj = ListTrait()
_default_value = []
_good_values = [[], [1], list(range(10)), (1,2)]
_bad_values = [10, [1,'a'], 'a']
def coerce(self, value):
if value is not None:
value = list(value)
return value
class Foo(object):
pass
class InstanceListTrait(HasTraits):
value = List(Instance(__name__+'.Foo'))
class TestInstanceList(TraitTestBase):
obj = InstanceListTrait()
def test_klass(self):
"""Test that the instance klass is properly assigned."""
self.assertIs(self.obj.traits()['value']._trait.klass, Foo)
_default_value = []
_good_values = [[Foo(), Foo(), None], None]
_bad_values = [['1', 2,], '1', [Foo]]
class LenListTrait(HasTraits):
value = List(Int, [0], minlen=1, maxlen=2)
class TestLenList(TraitTestBase):
obj = LenListTrait()
_default_value = [0]
_good_values = [[1], [1,2], (1,2)]
_bad_values = [10, [1,'a'], 'a', [], list(range(3))]
def coerce(self, value):
if value is not None:
value = list(value)
return value
class TupleTrait(HasTraits):
value = Tuple(Int(allow_none=True))
class TestTupleTrait(TraitTestBase):
obj = TupleTrait()
_default_value = None
_good_values = [(1,), None, (0,), [1], (None,)]
_bad_values = [10, (1,2), ('a'), ()]
def coerce(self, value):
if value is not None:
value = tuple(value)
return value
def test_invalid_args(self):
self.assertRaises(TypeError, Tuple, 5)
self.assertRaises(TypeError, Tuple, default_value='hello')
t = Tuple(Int, CBytes, default_value=(1,5))
class LooseTupleTrait(HasTraits):
value = Tuple((1,2,3))