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AzSuicideDataVisualization/.venv/Lib/site-packages/traitlets/tests/test_traitlets.py
Ayxan d660f2a4ca first commit
2022-05-23 00:16:32 +04:00

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"""Tests for traitlets.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
from unittest import TestCase
import pytest
from traitlets import (
All,
Any,
BaseDescriptor,
Bool,
Bytes,
Callable,
CBytes,
CFloat,
CInt,
CLong,
Complex,
CRegExp,
CUnicode,
Dict,
DottedObjectName,
Enum,
Float,
ForwardDeclaredInstance,
ForwardDeclaredType,
HasDescriptors,
HasTraits,
Instance,
Int,
Integer,
List,
Long,
MetaHasTraits,
ObjectName,
Set,
TCPAddress,
This,
TraitError,
TraitType,
Tuple,
Type,
Undefined,
Unicode,
Union,
default,
directional_link,
link,
observe,
observe_compat,
validate,
)
from traitlets.utils import cast_unicode
from ._warnings import expected_warnings
def change_dict(*ordered_values):
change_names = ("name", "old", "new", "owner", "type")
return dict(zip(change_names, ordered_values))
# -----------------------------------------------------------------------------
# Helper classes for testing
# -----------------------------------------------------------------------------
class HasTraitsStub(HasTraits):
def notify_change(self, change):
self._notify_name = change["name"]
self._notify_old = change["old"]
self._notify_new = change["new"]
self._notify_type = change["type"]
# -----------------------------------------------------------------------------
# Test classes
# -----------------------------------------------------------------------------
class TestTraitType(TestCase):
def test_get_undefined(self):
class A(HasTraits):
a = TraitType
a = A()
assert a.a is 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, getattr, B(), "tt")
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_deprecated_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(a.x, 11)
self.assertEqual(a._trait_values, {"x": 11})
b = B()
self.assertEqual(b.x, 20)
self.assertEqual(b._trait_values, {"x": 20})
c = C()
self.assertEqual(c._trait_values, {})
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(a.x, 11)
self.assertEqual(a._trait_values, {"x": 11})
def test_deprecated_method_warnings(self):
with expected_warnings([]):
class ShouldntWarn(HasTraits):
x = Integer()
@default("x")
def _x_default(self):
return 10
@validate("x")
def _x_validate(self, proposal):
return proposal.value
@observe("x")
def _x_changed(self, change):
pass
obj = ShouldntWarn()
obj.x = 5
assert obj.x == 5
with expected_warnings(["@validate", "@observe"]) as w:
class ShouldWarn(HasTraits):
x = Integer()
def _x_default(self):
return 10
def _x_validate(self, value, _):
return value
def _x_changed(self):
pass
obj = ShouldWarn()
obj.x = 5
assert obj.x == 5
def test_dynamic_initializer(self):
class A(HasTraits):
x = Int(10)
@default("x")
def _default_x(self):
return 11
class B(A):
x = Int(20)
class C(A):
@default("x")
def _default_x(self):
return 21
a = A()
self.assertEqual(a._trait_values, {})
self.assertEqual(a.x, 11)
self.assertEqual(a._trait_values, {"x": 11})
b = B()
self.assertEqual(b.x, 20)
self.assertEqual(b._trait_values, {"x": 20})
c = C()
self.assertEqual(c._trait_values, {})
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(a.x, 11)
self.assertEqual(a._trait_values, {"x": 11})
def test_tag_metadata(self):
class MyIntTT(TraitType):
metadata = {"a": 1, "b": 2}
a = MyIntTT(10).tag(b=3, c=4)
self.assertEqual(a.metadata, {"a": 1, "b": 3, "c": 4})
def test_metadata_localized_instance(self):
class MyIntTT(TraitType):
metadata = {"a": 1, "b": 2}
a = MyIntTT(10)
b = MyIntTT(10)
a.metadata["c"] = 3
# make sure that changing a's metadata didn't change b's metadata
self.assertNotIn("c", b.metadata)
def test_union_metadata(self):
class Foo(HasTraits):
bar = (Int().tag(ta=1) | Dict().tag(ta=2, ti="b")).tag(ti="a")
foo = Foo()
# At this point, no value has been set for bar, so value-specific
# is not set.
self.assertEqual(foo.trait_metadata("bar", "ta"), None)
self.assertEqual(foo.trait_metadata("bar", "ti"), "a")
foo.bar = {}
self.assertEqual(foo.trait_metadata("bar", "ta"), 2)
self.assertEqual(foo.trait_metadata("bar", "ti"), "b")
foo.bar = 1
self.assertEqual(foo.trait_metadata("bar", "ta"), 1)
self.assertEqual(foo.trait_metadata("bar", "ti"), "a")
def test_union_default_value(self):
class Foo(HasTraits):
bar = Union([Dict(), Int()], default_value=1)
foo = Foo()
self.assertEqual(foo.bar, 1)
def test_union_validation_priority(self):
class Foo(HasTraits):
bar = Union([CInt(), Unicode()])
foo = Foo()
foo.bar = "1"
# validation in order of the TraitTypes given
self.assertEqual(foo.bar, 1)
def test_union_trait_default_value(self):
class Foo(HasTraits):
bar = Union([Dict(), Int()])
self.assertEqual(Foo().bar, {})
def test_deprecated_metadata_access(self):
class MyIntTT(TraitType):
metadata = {"a": 1, "b": 2}
a = MyIntTT(10)
with expected_warnings(["use the instance .metadata dictionary directly"] * 2):
a.set_metadata("key", "value")
v = a.get_metadata("key")
self.assertEqual(v, "value")
with expected_warnings(["use the instance .help string directly"] * 2):
a.set_metadata("help", "some help")
v = a.get_metadata("help")
self.assertEqual(v, "some help")
def test_trait_types_deprecated(self):
with expected_warnings(["Traits should be given as instances"]):
class C(HasTraits):
t = Int
def test_trait_types_list_deprecated(self):
with expected_warnings(["Traits should be given as instances"]):
class C(HasTraits):
t = List(Int)
def test_trait_types_tuple_deprecated(self):
with expected_warnings(["Traits should be given as instances"]):
class C(HasTraits):
t = Tuple(Int)
def test_trait_types_dict_deprecated(self):
with expected_warnings(["Traits should be given as instances"]):
class C(HasTraits):
t = Dict(Int)
class TestHasDescriptorsMeta(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 TestHasDescriptors(TestCase):
def test_setup_instance(self):
class FooDescriptor(BaseDescriptor):
def instance_init(self, inst):
foo = inst.foo # instance should have the attr
class HasFooDescriptors(HasDescriptors):
fd = FooDescriptor()
def setup_instance(self, *args, **kwargs):
self.foo = kwargs.get("foo", None)
super().setup_instance(*args, **kwargs)
hfd = HasFooDescriptors(foo="bar")
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)
def callback4(name, old, new, obj):
self.cb = (name, old, new, obj)
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)
a.on_trait_change(callback4, "a")
a.a = 100000
self.assertEqual(self.cb, ("a", 10000, 100000, a))
self.assertEqual(len(a._trait_notifiers["a"]["change"]), 1)
a.on_trait_change(callback4, "a", remove=True)
self.assertEqual(len(a._trait_notifiers["a"]["change"]), 0)
def test_notify_only_once(self):
class A(HasTraits):
listen_to = ["a"]
a = Int(0)
b = 0
def __init__(self, **kwargs):
super().__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().__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 TestObserveDecorator(TestCase):
def setUp(self):
self._notify1 = []
self._notify2 = []
def notify1(self, change):
self._notify1.append(change)
def notify2(self, change):
self._notify2.append(change)
def test_notify_all(self):
class A(HasTraits):
a = Int()
b = Float()
a = A()
a.observe(self.notify1)
a.a = 0
self.assertEqual(len(self._notify1), 0)
a.b = 0.0
self.assertEqual(len(self._notify1), 0)
a.a = 10
change = change_dict("a", 0, 10, a, "change")
self.assertTrue(change in self._notify1)
a.b = 10.0
change = change_dict("b", 0.0, 10.0, a, "change")
self.assertTrue(change in self._notify1)
self.assertRaises(TraitError, setattr, a, "a", "bad string")
self.assertRaises(TraitError, setattr, a, "b", "bad string")
self._notify1 = []
a.unobserve(self.notify1)
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.observe(self.notify1, "a")
a.a = 0
self.assertEqual(len(self._notify1), 0)
a.a = 10
change = change_dict("a", 0, 10, a, "change")
self.assertTrue(change 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.observe(self.notify1, "a")
b.observe(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
change = change_dict("a", 0, 10, b, "change")
self.assertTrue(change in self._notify1)
change = change_dict("b", 0.0, 10.0, b, "change")
self.assertTrue(change in self._notify2)
def test_static_notify(self):
class A(HasTraits):
a = Int()
b = Int()
_notify1 = []
_notify_any = []
@observe("a")
def _a_changed(self, change):
self._notify1.append(change)
@observe(All)
def _any_changed(self, change):
self._notify_any.append(change)
a = A()
a.a = 0
self.assertEqual(len(a._notify1), 0)
a.a = 10
change = change_dict("a", 0, 10, a, "change")
self.assertTrue(change in a._notify1)
a.b = 1
self.assertEqual(len(a._notify_any), 2)
change = change_dict("b", 0, 1, a, "change")
self.assertTrue(change in a._notify_any)
class B(A):
b = Float()
_notify2 = []
@observe("b")
def _b_changed(self, change):
self._notify2.append(change)
b = B()
b.a = 10
b.b = 10.0
change = change_dict("a", 0, 10, b, "change")
self.assertTrue(change in b._notify1)
change = change_dict("b", 0.0, 10.0, b, "change")
self.assertTrue(change in b._notify2)
def test_notify_args(self):
def callback0():
self.cb = ()
def callback1(change):
self.cb = change
class A(HasTraits):
a = Int()
a = A()
a.on_trait_change(callback0, "a")
a.a = 10
self.assertEqual(self.cb, ())
a.unobserve(callback0, "a")
a.observe(callback1, "a")
a.a = 100
change = change_dict("a", 10, 100, a, "change")
self.assertEqual(self.cb, change)
self.assertEqual(len(a._trait_notifiers["a"]["change"]), 1)
a.unobserve(callback1, "a")
self.assertEqual(len(a._trait_notifiers["a"]["change"]), 0)
def test_notify_only_once(self):
class A(HasTraits):
listen_to = ["a"]
a = Int(0)
b = 0
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.observe(self.listener1, ["a"])
def listener1(self, change):
self.b += 1
class B(A):
c = 0
d = 0
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.observe(self.listener2)
def listener2(self, change):
self.c += 1
@observe("a")
def _a_changed(self, change):
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"])
self.assertTrue(a.has_trait("f"))
self.assertFalse(a.has_trait("g"))
def test_trait_has_value(self):
class A(HasTraits):
i = Int()
f = Float()
a = A()
self.assertFalse(a.trait_has_value("f"))
self.assertFalse(a.trait_has_value("g"))
a.i = 1
a.f
self.assertTrue(a.trait_has_value("i"))
self.assertTrue(a.trait_has_value("f"))
def test_trait_metadata_deprecated(self):
with expected_warnings([r"metadata should be set using the \.tag\(\) method"]):
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(self):
class A(HasTraits):
i = Int().tag(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().tag(config_key="VALUE1", other_thing="VALUE2")
f = Float().tag(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_traits_metadata_deprecated(self):
with expected_warnings([r"metadata should be set using the \.tag\(\) method"] * 2):
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().__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:
pass
class A(HasTraits):
klass = Type(allow_none=True)
a = A()
self.assertEqual(a.klass, object)
a.klass = B
self.assertEqual(a.klass, B)
self.assertRaises(TraitError, setattr, a, "klass", 10)
def test_default_options(self):
class B:
pass
class C(B):
pass
class A(HasTraits):
# Different possible combinations of options for default_value
# and klass. default_value=None is only valid with allow_none=True.
k1 = Type()
k2 = Type(None, allow_none=True)
k3 = Type(B)
k4 = Type(klass=B)
k5 = Type(default_value=None, klass=B, allow_none=True)
k6 = Type(default_value=C, klass=B)
self.assertIs(A.k1.default_value, object)
self.assertIs(A.k1.klass, object)
self.assertIs(A.k2.default_value, None)
self.assertIs(A.k2.klass, object)
self.assertIs(A.k3.default_value, B)
self.assertIs(A.k3.klass, B)
self.assertIs(A.k4.default_value, B)
self.assertIs(A.k4.klass, B)
self.assertIs(A.k5.default_value, None)
self.assertIs(A.k5.klass, B)
self.assertIs(A.k6.default_value, C)
self.assertIs(A.k6.klass, B)
a = A()
self.assertIs(a.k1, object)
self.assertIs(a.k2, None)
self.assertIs(a.k3, B)
self.assertIs(a.k4, B)
self.assertIs(a.k5, None)
self.assertIs(a.k6, C)
def test_value(self):
class B:
pass
class C:
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:
pass
class C(B):
pass
class A(HasTraits):
klass = Type(B)
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:
pass
class A(HasTraits):
klass = Type("bad default", B)
self.assertRaises(ImportError, A)
class C(HasTraits):
klass = Type(None, B)
self.assertRaises(TraitError, getattr, C(), "klass")
def test_str_klass(self):
class A(HasTraits):
klass = Type("traitlets.config.Config")
from traitlets.config import Config
a = A()
a.klass = Config
self.assertEqual(a.klass, Config)
self.assertRaises(TraitError, setattr, a, "klass", 10)
def test_set_str_klass(self):
class A(HasTraits):
klass = Type()
a = A(klass="traitlets.config.Config")
from traitlets.config import Config
self.assertEqual(a.klass, Config)
class TestInstance(TestCase):
def test_basic(self):
class Foo:
pass
class Bar(Foo):
pass
class Bah:
pass
class A(HasTraits):
inst = Instance(Foo, allow_none=True)
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:
pass
class Bar(Foo):
pass
class Bah:
pass
class FooInstance(Instance):
klass = Foo
class A(HasTraits):
inst = FooInstance(allow_none=True)
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:
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:
def __init__(self, c):
self.c = c
class Bar:
pass
class Bah:
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, allow_none=True)
c = C()
self.assertTrue(c.inst is None)
def test_bad_default(self):
class Foo:
pass
class A(HasTraits):
inst = Instance(Foo)
a = A()
with self.assertRaises(TraitError):
a.inst
def test_instance(self):
class Foo:
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)
def test_this_in_container(self):
class Tree(HasTraits):
value = Unicode()
leaves = List(This())
tree = Tree(value="foo", leaves=[Tree(value="bar"), Tree(value="buzz")])
with self.assertRaises(TraitError):
tree.leaves = [1, 2]
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", [10], {"ten": 10}, (10,), None, 1j]
_bad_values = []
class UnionTrait(HasTraits):
value = Union([Type(), Bool()])
class UnionTraitTest(TraitTestBase):
obj = UnionTrait(value="traitlets.config.Config")
_good_values = [int, float, True]
_bad_values = [[], (0,), 1j]
class CallableTrait(HasTraits):
value = Callable()
class CallableTraitTest(TraitTestBase):
obj = CallableTrait(value=lambda x: type(x))
_good_values = [int, sorted, lambda x: print(x)]
_bad_values = [[], 1, ""]
class OrTrait(HasTraits):
value = Bool() | Unicode()
class OrTraitTest(TraitTestBase):
obj = OrTrait()
_good_values = [True, False, "ten"]
_bad_values = [[], (0,), 1j]
class IntTrait(HasTraits):
value = Int(99, min=-100)
class TestInt(TraitTestBase):
obj = IntTrait()
_default_value = 99
_good_values = [10, -10]
_bad_values = [
"ten",
[10],
{"ten": 10},
(10,),
None,
1j,
10.1,
-10.1,
"10L",
"-10L",
"10.1",
"-10.1",
"10",
"-10",
-200,
]
class CIntTrait(HasTraits):
value = CInt("5")
class TestCInt(TraitTestBase):
obj = CIntTrait()
_default_value = 5
_good_values = ["10", "-10", 10, 10.0, -10.0, 10.1]
_bad_values = ["ten", [10], {"ten": 10}, (10,), None, 1j, "10.1"]
def coerce(self, n):
return int(n)
class MinBoundCIntTrait(HasTraits):
value = CInt("5", min=3)
class TestMinBoundCInt(TestCInt):
obj = MinBoundCIntTrait()
_default_value = 5
_good_values = [3, 3.0, "3"]
_bad_values = [2.6, 2, -3, -3.0]
class LongTrait(HasTraits):
value = Long(99)
class TestLong(TraitTestBase):
obj = LongTrait()
_default_value = 99
_good_values = [10, -10]
_bad_values = [
"ten",
[10],
{"ten": 10},
(10,),
None,
1j,
10.1,
-10.1,
"10",
"-10",
"10L",
"-10L",
"10.1",
"-10.1",
]
class MinBoundLongTrait(HasTraits):
value = Long(99, min=5)
class TestMinBoundLong(TraitTestBase):
obj = MinBoundLongTrait()
_default_value = 99
_good_values = [5, 10]
_bad_values = [4, -10]
class MaxBoundLongTrait(HasTraits):
value = Long(5, max=10)
class TestMaxBoundLong(TraitTestBase):
obj = MaxBoundLongTrait()
_default_value = 5
_good_values = [10, -2]
_bad_values = [11, 20]
class CLongTrait(HasTraits):
value = CLong("5")
class TestCLong(TraitTestBase):
obj = CLongTrait()
_default_value = 5
_good_values = ["10", "-10", 10, 10.0, -10.0, 10.1]
_bad_values = ["ten", [10], {"ten": 10}, (10,), None, 1j, "10.1"]
def coerce(self, n):
return int(n)
class MaxBoundCLongTrait(HasTraits):
value = CLong("5", max=10)
class TestMaxBoundCLong(TestCLong):
obj = MaxBoundCLongTrait()
_default_value = 5
_good_values = [10, "10", 10.3]
_bad_values = [11.0, "11"]
class IntegerTrait(HasTraits):
value = Integer(1)
class TestInteger(TestLong):
obj = IntegerTrait()
_default_value = 1
def coerce(self, n):
return int(n)
class MinBoundIntegerTrait(HasTraits):
value = Integer(5, min=3)
class TestMinBoundInteger(TraitTestBase):
obj = MinBoundIntegerTrait()
_default_value = 5
_good_values = 3, 20
_bad_values = [2, -10]
class MaxBoundIntegerTrait(HasTraits):
value = Integer(1, max=3)
class TestMaxBoundInteger(TraitTestBase):
obj = MaxBoundIntegerTrait()
_default_value = 1
_good_values = 3, -2
_bad_values = [4, 10]
class FloatTrait(HasTraits):
value = Float(99.0, max=200.0)
class TestFloat(TraitTestBase):
obj = FloatTrait()
_default_value = 99.0
_good_values = [10, -10, 10.1, -10.1]
_bad_values = [
"ten",
[10],
{"ten": 10},
(10,),
None,
1j,
"10",
"-10",
"10L",
"-10L",
"10.1",
"-10.1",
201.0,
]
class CFloatTrait(HasTraits):
value = CFloat("99.0", max=200.0)
class TestCFloat(TraitTestBase):
obj = CFloatTrait()
_default_value = 99.0
_good_values = [10, 10.0, 10.5, "10.0", "10", "-10"]
_bad_values = ["ten", [10], {"ten": 10}, (10,), None, 1j, 200.1, "200.1"]
def coerce(self, v):
return float(v)
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 = ["10L", "-10L", "ten", [10], {"ten": 10}, (10,), None]
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, "string"]
class UnicodeTrait(HasTraits):
value = Unicode("unicode")
class TestUnicode(TraitTestBase):
obj = UnicodeTrait()
_default_value = "unicode"
_good_values = ["10", "-10", "10L", "-10L", "10.1", "-10.1", "", "string", "€", b"bytestring"]
_bad_values = [10, -10, 10.1, -10.1, 1j, [10], ["ten"], {"ten": 10}, (10,), None]
def coerce(self, v):
return cast_unicode(v)
class ObjectNameTrait(HasTraits):
value = ObjectName("abc")
class TestObjectName(TraitTestBase):
obj = ObjectNameTrait()
_default_value = "abc"
_good_values = ["a", "gh", "g9", "g_", "_G", "a345_"]
_bad_values = [
1,
"",
"€",
"9g",
"!",
"#abc",
"aj@",
"a.b",
"a()",
"a[0]",
None,
object(),
object,
]
_good_values.append("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"]
_bad_values = [1, "abc.€", "_.@", ".", ".abc", "abc.", ".abc.", None]
_good_values.append("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:
pass
class NoneInstanceListTrait(HasTraits):
value = List(Instance(Foo))
class TestNoneInstanceList(TraitTestBase):
obj = NoneInstanceListTrait()
_default_value = []
_good_values = [[Foo(), Foo()], []]
_bad_values = [[None], [Foo(), None]]
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()], []]
_bad_values = [
[
"1",
2,
],
"1",
[Foo],
None,
]
class UnionListTrait(HasTraits):
value = List(Int() | Bool())
class TestUnionListTrait(TraitTestBase):
obj = UnionListTrait()
_default_value = []
_good_values = [[True, 1], [False, True]]
_bad_values = [[1, "True"], False]
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), default_value=(1,))
class TestTupleTrait(TraitTestBase):
obj = TupleTrait()
_default_value = (1,)
_good_values = [(1,), (0,), [1]]
_bad_values = [10, (1, 2), ("a"), (), None]
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))
class TestLooseTupleTrait(TraitTestBase):
obj = LooseTupleTrait()
_default_value = (1, 2, 3)
_good_values = [(1,), [1], (0,), tuple(range(5)), tuple("hello"), ("a", 5), ()]
_bad_values = [10, "hello", {}, None]
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 MultiTupleTrait(HasTraits):
value = Tuple(Int(), Bytes(), default_value=[99, b"bottles"])
class TestMultiTuple(TraitTestBase):
obj = MultiTupleTrait()
_default_value = (99, b"bottles")
_good_values = [(1, b"a"), (2, b"b")]
_bad_values = ((), 10, b"a", (1, b"a", 3), (b"a", 1), (1, "a"))
@pytest.mark.parametrize(
"Trait",
(
List,
Tuple,
Set,
Dict,
Integer,
Unicode,
),
)
def test_allow_none_default_value(Trait):
class C(HasTraits):
t = Trait(default_value=None, allow_none=True)
# test default value
c = C()
assert c.t is None
# and in constructor
c = C(t=None)
assert c.t is None
@pytest.mark.parametrize(
"Trait, default_value",
((List, []), (Tuple, ()), (Set, set()), (Dict, {}), (Integer, 0), (Unicode, "")),
)
def test_default_value(Trait, default_value):
class C(HasTraits):
t = Trait()
# test default value
c = C()
assert type(c.t) is type(default_value)
assert c.t == default_value
@pytest.mark.parametrize(
"Trait, default_value",
((List, []), (Tuple, ()), (Set, set())),
)
def test_subclass_default_value(Trait, default_value):
"""Test deprecated default_value=None behavior for Container subclass traits"""
class SubclassTrait(Trait):
def __init__(self, default_value=None):
super().__init__(default_value=default_value)
class C(HasTraits):
t = SubclassTrait()
# test default value
c = C()
assert type(c.t) is type(default_value)
assert c.t == default_value
class CRegExpTrait(HasTraits):
value = CRegExp(r"")
class TestCRegExp(TraitTestBase):
def coerce(self, value):
return re.compile(value)
obj = CRegExpTrait()
_default_value = re.compile(r"")
_good_values = [r"\d+", re.compile(r"\d+")]
_bad_values = ["(", None, ()]
class DictTrait(HasTraits):
value = Dict()
def test_dict_assignment():
d = {}
c = DictTrait()
c.value = d
d["a"] = 5
assert d == c.value
assert c.value is d
class UniformlyValueValidatedDictTrait(HasTraits):
value = Dict(trait=Unicode(), default_value={"foo": "1"})
class TestInstanceUniformlyValueValidatedDict(TraitTestBase):
obj = UniformlyValueValidatedDictTrait()
_default_value = {"foo": "1"}
_good_values = [{"foo": "0", "bar": "1"}]
_bad_values = [{"foo": 0, "bar": "1"}]
class NonuniformlyValueValidatedDictTrait(HasTraits):
value = Dict(traits={"foo": Int()}, default_value={"foo": 1})
class TestInstanceNonuniformlyValueValidatedDict(TraitTestBase):
obj = NonuniformlyValueValidatedDictTrait()
_default_value = {"foo": 1}
_good_values = [{"foo": 0, "bar": "1"}, {"foo": 0, "bar": 1}]
_bad_values = [{"foo": "0", "bar": "1"}]
class KeyValidatedDictTrait(HasTraits):
value = Dict(key_trait=Unicode(), default_value={"foo": "1"})
class TestInstanceKeyValidatedDict(TraitTestBase):
obj = KeyValidatedDictTrait()
_default_value = {"foo": "1"}
_good_values = [{"foo": "0", "bar": "1"}]
_bad_values = [{"foo": "0", 0: "1"}]
class FullyValidatedDictTrait(HasTraits):
value = Dict(
trait=Unicode(), key_trait=Unicode(), traits={"foo": Int()}, default_value={"foo": 1}
)
class TestInstanceFullyValidatedDict(TraitTestBase):
obj = FullyValidatedDictTrait()
_default_value = {"foo": 1}
_good_values = [{"foo": 0, "bar": "1"}, {"foo": 1, "bar": "2"}]
_bad_values = [{"foo": 0, "bar": 1}, {"foo": "0", "bar": "1"}, {"foo": 0, 0: "1"}]
def test_dict_default_value():
"""Check that the `{}` default value of the Dict traitlet constructor is
actually copied."""
class Foo(HasTraits):
d1 = Dict()
d2 = Dict()
foo = Foo()
assert foo.d1 == {}
assert foo.d2 == {}
assert foo.d1 is not foo.d2
class TestValidationHook(TestCase):
def test_parity_trait(self):
"""Verify that the early validation hook is effective"""
class Parity(HasTraits):
value = Int(0)
parity = Enum(["odd", "even"], default_value="even")
@validate("value")
def _value_validate(self, proposal):
value = proposal["value"]
if self.parity == "even" and value % 2:
raise TraitError("Expected an even number")
if self.parity == "odd" and (value % 2 == 0):
raise TraitError("Expected an odd number")
return value
u = Parity()
u.parity = "odd"
u.value = 1 # OK
with self.assertRaises(TraitError):
u.value = 2 # Trait Error
u.parity = "even"
u.value = 2 # OK
def test_multiple_validate(self):
"""Verify that we can register the same validator to multiple names"""
class OddEven(HasTraits):
odd = Int(1)
even = Int(0)
@validate("odd", "even")
def check_valid(self, proposal):
if proposal["trait"].name == "odd" and not proposal["value"] % 2:
raise TraitError("odd should be odd")
if proposal["trait"].name == "even" and proposal["value"] % 2:
raise TraitError("even should be even")
u = OddEven()
u.odd = 3 # OK
with self.assertRaises(TraitError):
u.odd = 2 # Trait Error
u.even = 2 # OK
with self.assertRaises(TraitError):
u.even = 3 # Trait Error
class TestLink(TestCase):
def test_connect_same(self):
"""Verify two traitlets of the same type can be linked together using link."""
# Create two simple classes with Int traitlets.
class A(HasTraits):
value = Int()
a = A(value=9)
b = A(value=8)
# Conenct the two classes.
c = link((a, "value"), (b, "value"))
# Make sure the values are the same at the point of linking.
self.assertEqual(a.value, b.value)
# Change one of the values to make sure they stay in sync.
a.value = 5
self.assertEqual(a.value, b.value)
b.value = 6
self.assertEqual(a.value, b.value)
def test_link_different(self):
"""Verify two traitlets of different types can be linked together using link."""
# Create two simple classes with Int traitlets.
class A(HasTraits):
value = Int()
class B(HasTraits):
count = Int()
a = A(value=9)
b = B(count=8)
# Conenct the two classes.
c = link((a, "value"), (b, "count"))
# Make sure the values are the same at the point of linking.
self.assertEqual(a.value, b.count)
# Change one of the values to make sure they stay in sync.
a.value = 5
self.assertEqual(a.value, b.count)
b.count = 4
self.assertEqual(a.value, b.count)
def test_unlink_link(self):
"""Verify two linked traitlets can be unlinked and relinked."""
# Create two simple classes with Int traitlets.
class A(HasTraits):
value = Int()
a = A(value=9)
b = A(value=8)
# Connect the two classes.
c = link((a, "value"), (b, "value"))
a.value = 4
c.unlink()
# Change one of the values to make sure they don't stay in sync.
a.value = 5
self.assertNotEqual(a.value, b.value)
c.link()
self.assertEqual(a.value, b.value)
a.value += 1
self.assertEqual(a.value, b.value)
def test_callbacks(self):
"""Verify two linked traitlets have their callbacks called once."""
# Create two simple classes with Int traitlets.
class A(HasTraits):
value = Int()
class B(HasTraits):
count = Int()
a = A(value=9)
b = B(count=8)
# Register callbacks that count.
callback_count = []
def a_callback(name, old, new):
callback_count.append("a")
a.on_trait_change(a_callback, "value")
def b_callback(name, old, new):
callback_count.append("b")
b.on_trait_change(b_callback, "count")
# Connect the two classes.
c = link((a, "value"), (b, "count"))
# Make sure b's count was set to a's value once.
self.assertEqual("".join(callback_count), "b")
del callback_count[:]
# Make sure a's value was set to b's count once.
b.count = 5
self.assertEqual("".join(callback_count), "ba")
del callback_count[:]
# Make sure b's count was set to a's value once.
a.value = 4
self.assertEqual("".join(callback_count), "ab")
del callback_count[:]
def test_tranform(self):
"""Test transform link."""
# Create two simple classes with Int traitlets.
class A(HasTraits):
value = Int()
a = A(value=9)
b = A(value=8)
# Conenct the two classes.
c = link((a, "value"), (b, "value"), transform=(lambda x: 2 * x, lambda x: int(x / 2.0)))
# Make sure the values are correct at the point of linking.
self.assertEqual(b.value, 2 * a.value)
# Change one the value of the source and check that it modifies the target.
a.value = 5
self.assertEqual(b.value, 10)
# Change one the value of the target and check that it modifies the
# source.
b.value = 6
self.assertEqual(a.value, 3)
def test_link_broken_at_source(self):
class MyClass(HasTraits):
i = Int()
j = Int()
@observe("j")
def another_update(self, change):
self.i = change.new * 2
mc = MyClass()
l = link((mc, "i"), (mc, "j")) # noqa
self.assertRaises(TraitError, setattr, mc, "i", 2)
def test_link_broken_at_target(self):
class MyClass(HasTraits):
i = Int()
j = Int()
@observe("i")
def another_update(self, change):
self.j = change.new * 2
mc = MyClass()
l = link((mc, "i"), (mc, "j")) # noqa
self.assertRaises(TraitError, setattr, mc, "j", 2)
class TestDirectionalLink(TestCase):
def test_connect_same(self):
"""Verify two traitlets of the same type can be linked together using directional_link."""
# Create two simple classes with Int traitlets.
class A(HasTraits):
value = Int()
a = A(value=9)
b = A(value=8)
# Conenct the two classes.
c = directional_link((a, "value"), (b, "value"))
# Make sure the values are the same at the point of linking.
self.assertEqual(a.value, b.value)
# Change one the value of the source and check that it synchronizes the target.
a.value = 5
self.assertEqual(b.value, 5)
# Change one the value of the target and check that it has no impact on the source
b.value = 6
self.assertEqual(a.value, 5)
def test_tranform(self):
"""Test transform link."""
# Create two simple classes with Int traitlets.
class A(HasTraits):
value = Int()
a = A(value=9)
b = A(value=8)
# Conenct the two classes.
c = directional_link((a, "value"), (b, "value"), lambda x: 2 * x)
# Make sure the values are correct at the point of linking.
self.assertEqual(b.value, 2 * a.value)
# Change one the value of the source and check that it modifies the target.
a.value = 5
self.assertEqual(b.value, 10)
# Change one the value of the target and check that it has no impact on the source
b.value = 6
self.assertEqual(a.value, 5)
def test_link_different(self):
"""Verify two traitlets of different types can be linked together using link."""
# Create two simple classes with Int traitlets.
class A(HasTraits):
value = Int()
class B(HasTraits):
count = Int()
a = A(value=9)
b = B(count=8)
# Conenct the two classes.
c = directional_link((a, "value"), (b, "count"))
# Make sure the values are the same at the point of linking.
self.assertEqual(a.value, b.count)
# Change one the value of the source and check that it synchronizes the target.
a.value = 5
self.assertEqual(b.count, 5)
# Change one the value of the target and check that it has no impact on the source
b.value = 6
self.assertEqual(a.value, 5)
def test_unlink_link(self):
"""Verify two linked traitlets can be unlinked and relinked."""
# Create two simple classes with Int traitlets.
class A(HasTraits):
value = Int()
a = A(value=9)
b = A(value=8)
# Connect the two classes.
c = directional_link((a, "value"), (b, "value"))
a.value = 4
c.unlink()
# Change one of the values to make sure they don't stay in sync.
a.value = 5
self.assertNotEqual(a.value, b.value)
c.link()
self.assertEqual(a.value, b.value)
a.value += 1
self.assertEqual(a.value, b.value)
class Pickleable(HasTraits):
i = Int()
@observe("i")
def _i_changed(self, change):
pass
@validate("i")
def _i_validate(self, commit):
return commit["value"]
j = Int()
def __init__(self):
with self.hold_trait_notifications():
self.i = 1
self.on_trait_change(self._i_changed, "i")
def test_pickle_hastraits():
c = Pickleable()
for protocol in range(pickle.HIGHEST_PROTOCOL + 1):
p = pickle.dumps(c, protocol)
c2 = pickle.loads(p)
assert c2.i == c.i
assert c2.j == c.j
c.i = 5
for protocol in range(pickle.HIGHEST_PROTOCOL + 1):
p = pickle.dumps(c, protocol)
c2 = pickle.loads(p)
assert c2.i == c.i
assert c2.j == c.j
def test_hold_trait_notifications():
changes = []
class Test(HasTraits):
a = Integer(0)
b = Integer(0)
def _a_changed(self, name, old, new):
changes.append((old, new))
def _b_validate(self, value, trait):
if value != 0:
raise TraitError("Only 0 is a valid value")
return value
# Test context manager and nesting
t = Test()
with t.hold_trait_notifications():
with t.hold_trait_notifications():
t.a = 1
assert t.a == 1
assert changes == []
t.a = 2
assert t.a == 2
with t.hold_trait_notifications():
t.a = 3
assert t.a == 3
assert changes == []
t.a = 4
assert t.a == 4
assert changes == []
t.a = 4
assert t.a == 4
assert changes == []
assert changes == [(0, 4)]
# Test roll-back
try:
with t.hold_trait_notifications():
t.b = 1 # raises a Trait error
except Exception:
pass
assert t.b == 0
class RollBack(HasTraits):
bar = Int()
def _bar_validate(self, value, trait):
if value:
raise TraitError("foobar")
return value
class TestRollback(TestCase):
def test_roll_back(self):
def assign_rollback():
RollBack(bar=1)
self.assertRaises(TraitError, assign_rollback)
class CacheModification(HasTraits):
foo = Int()
bar = Int()
def _bar_validate(self, value, trait):
self.foo = value
return value
def _foo_validate(self, value, trait):
self.bar = value
return value
def test_cache_modification():
CacheModification(foo=1)
CacheModification(bar=1)
class OrderTraits(HasTraits):
notified = Dict()
a = Unicode()
b = Unicode()
c = Unicode()
d = Unicode()
e = Unicode()
f = Unicode()
g = Unicode()
h = Unicode()
i = Unicode()
j = Unicode()
k = Unicode()
l = Unicode() # noqa
def _notify(self, name, old, new):
"""check the value of all traits when each trait change is triggered
This verifies that the values are not sensitive
to dict ordering when loaded from kwargs
"""
# check the value of the other traits
# when a given trait change notification fires
self.notified[name] = {c: getattr(self, c) for c in "abcdefghijkl"}
def __init__(self, **kwargs):
self.on_trait_change(self._notify)
super().__init__(**kwargs)
def test_notification_order():
d = {c: c for c in "abcdefghijkl"}
obj = OrderTraits()
assert obj.notified == {}
obj = OrderTraits(**d)
notifications = {c: d for c in "abcdefghijkl"}
assert obj.notified == notifications
###
# Traits for Forward Declaration Tests
###
class ForwardDeclaredInstanceTrait(HasTraits):
value = ForwardDeclaredInstance("ForwardDeclaredBar", allow_none=True)
class ForwardDeclaredTypeTrait(HasTraits):
value = ForwardDeclaredType("ForwardDeclaredBar", allow_none=True)
class ForwardDeclaredInstanceListTrait(HasTraits):
value = List(ForwardDeclaredInstance("ForwardDeclaredBar"))
class ForwardDeclaredTypeListTrait(HasTraits):
value = List(ForwardDeclaredType("ForwardDeclaredBar"))
###
# End Traits for Forward Declaration Tests
###
###
# Classes for Forward Declaration Tests
###
class ForwardDeclaredBar:
pass
class ForwardDeclaredBarSub(ForwardDeclaredBar):
pass
###
# End Classes for Forward Declaration Tests
###
###
# Forward Declaration Tests
###
class TestForwardDeclaredInstanceTrait(TraitTestBase):
obj = ForwardDeclaredInstanceTrait()
_default_value = None
_good_values = [None, ForwardDeclaredBar(), ForwardDeclaredBarSub()]
_bad_values = ["foo", 3, ForwardDeclaredBar, ForwardDeclaredBarSub]
class TestForwardDeclaredTypeTrait(TraitTestBase):
obj = ForwardDeclaredTypeTrait()
_default_value = None
_good_values = [None, ForwardDeclaredBar, ForwardDeclaredBarSub]
_bad_values = ["foo", 3, ForwardDeclaredBar(), ForwardDeclaredBarSub()]
class TestForwardDeclaredInstanceList(TraitTestBase):
obj = ForwardDeclaredInstanceListTrait()
def test_klass(self):
"""Test that the instance klass is properly assigned."""
self.assertIs(self.obj.traits()["value"]._trait.klass, ForwardDeclaredBar)
_default_value = []
_good_values = [
[ForwardDeclaredBar(), ForwardDeclaredBarSub()],
[],
]
_bad_values = [
ForwardDeclaredBar(),
[ForwardDeclaredBar(), 3, None],
"1",
# Note that this is the type, not an instance.
[ForwardDeclaredBar],
[None],
None,
]
class TestForwardDeclaredTypeList(TraitTestBase):
obj = ForwardDeclaredTypeListTrait()
def test_klass(self):
"""Test that the instance klass is properly assigned."""
self.assertIs(self.obj.traits()["value"]._trait.klass, ForwardDeclaredBar)
_default_value = []
_good_values = [
[ForwardDeclaredBar, ForwardDeclaredBarSub],
[],
]
_bad_values = [
ForwardDeclaredBar,
[ForwardDeclaredBar, 3],
"1",
# Note that this is an instance, not the type.
[ForwardDeclaredBar()],
[None],
None,
]
###
# End Forward Declaration Tests
###
class TestDynamicTraits(TestCase):
def setUp(self):
self._notify1 = []
def notify1(self, name, old, new):
self._notify1.append((name, old, new))
def test_notify_all(self):
class A(HasTraits):
pass
a = A()
self.assertTrue(not hasattr(a, "x"))
self.assertTrue(not hasattr(a, "y"))
# Dynamically add trait x.
a.add_traits(x=Int())
self.assertTrue(hasattr(a, "x"))
self.assertTrue(isinstance(a, (A,)))
# Dynamically add trait y.
a.add_traits(y=Float())
self.assertTrue(hasattr(a, "y"))
self.assertTrue(isinstance(a, (A,)))
self.assertEqual(a.__class__.__name__, A.__name__)
# Create a new instance and verify that x and y
# aren't defined.
b = A()
self.assertTrue(not hasattr(b, "x"))
self.assertTrue(not hasattr(b, "y"))
# Verify that notification works like normal.
a.on_trait_change(self.notify1)
a.x = 0
self.assertEqual(len(self._notify1), 0)
a.y = 0.0
self.assertEqual(len(self._notify1), 0)
a.x = 10
self.assertTrue(("x", 0, 10) in self._notify1)
a.y = 10.0
self.assertTrue(("y", 0.0, 10.0) in self._notify1)
self.assertRaises(TraitError, setattr, a, "x", "bad string")
self.assertRaises(TraitError, setattr, a, "y", "bad string")
self._notify1 = []
a.on_trait_change(self.notify1, remove=True)
a.x = 20
a.y = 20.0
self.assertEqual(len(self._notify1), 0)
def test_enum_no_default():
class C(HasTraits):
t = Enum(["a", "b"])
c = C()
c.t = "a"
assert c.t == "a"
c = C()
with pytest.raises(TraitError):
t = c.t
c = C(t="b")
assert c.t == "b"
def test_default_value_repr():
class C(HasTraits):
t = Type("traitlets.HasTraits")
t2 = Type(HasTraits)
n = Integer(0)
lis = List()
d = Dict()
assert C.t.default_value_repr() == "'traitlets.HasTraits'"
assert C.t2.default_value_repr() == "'traitlets.traitlets.HasTraits'"
assert C.n.default_value_repr() == "0"
assert C.lis.default_value_repr() == "[]"
assert C.d.default_value_repr() == "{}"
class TransitionalClass(HasTraits):
d = Any()
@default("d")
def _d_default(self):
return TransitionalClass
parent_super = False
calls_super = Integer(0)
@default("calls_super")
def _calls_super_default(self):
return -1
@observe("calls_super")
@observe_compat
def _calls_super_changed(self, change):
self.parent_super = change
parent_override = False
overrides = Integer(0)
@observe("overrides")
@observe_compat
def _overrides_changed(self, change):
self.parent_override = change
class SubClass(TransitionalClass):
def _d_default(self):
return SubClass
subclass_super = False
def _calls_super_changed(self, name, old, new):
self.subclass_super = True
super()._calls_super_changed(name, old, new)
subclass_override = False
def _overrides_changed(self, name, old, new):
self.subclass_override = True
def test_subclass_compat():
obj = SubClass()
obj.calls_super = 5
assert obj.parent_super
assert obj.subclass_super
obj.overrides = 5
assert obj.subclass_override
assert not obj.parent_override
assert obj.d is SubClass
class DefinesHandler(HasTraits):
parent_called = False
trait = Integer()
@observe("trait")
def handler(self, change):
self.parent_called = True
class OverridesHandler(DefinesHandler):
child_called = False
@observe("trait")
def handler(self, change):
self.child_called = True
def test_subclass_override_observer():
obj = OverridesHandler()
obj.trait = 5
assert obj.child_called
assert not obj.parent_called
class DoesntRegisterHandler(DefinesHandler):
child_called = False
def handler(self, change):
self.child_called = True
def test_subclass_override_not_registered():
"""Subclass that overrides observer and doesn't re-register unregisters both"""
obj = DoesntRegisterHandler()
obj.trait = 5
assert not obj.child_called
assert not obj.parent_called
class AddsHandler(DefinesHandler):
child_called = False
@observe("trait")
def child_handler(self, change):
self.child_called = True
def test_subclass_add_observer():
obj = AddsHandler()
obj.trait = 5
assert obj.child_called
assert obj.parent_called
def test_observe_iterables():
class C(HasTraits):
i = Integer()
s = Unicode()
c = C()
recorded = {}
def record(change):
recorded["change"] = change
# observe with names=set
c.observe(record, names={"i", "s"})
c.i = 5
assert recorded["change"].name == "i"
assert recorded["change"].new == 5
c.s = "hi"
assert recorded["change"].name == "s"
assert recorded["change"].new == "hi"
# observe with names=custom container with iter, contains
class MyContainer:
def __init__(self, container):
self.container = container
def __iter__(self):
return iter(self.container)
def __contains__(self, key):
return key in self.container
c.observe(record, names=MyContainer({"i", "s"}))
c.i = 10
assert recorded["change"].name == "i"
assert recorded["change"].new == 10
c.s = "ok"
assert recorded["change"].name == "s"
assert recorded["change"].new == "ok"
def test_super_args():
class SuperRecorder:
def __init__(self, *args, **kwargs):
self.super_args = args
self.super_kwargs = kwargs
class SuperHasTraits(HasTraits, SuperRecorder):
i = Integer()
obj = SuperHasTraits("a1", "a2", b=10, i=5, c="x")
assert obj.i == 5
assert not hasattr(obj, "b")
assert not hasattr(obj, "c")
assert obj.super_args == ("a1", "a2")
assert obj.super_kwargs == {"b": 10, "c": "x"}
def test_super_bad_args():
class SuperHasTraits(HasTraits):
a = Integer()
w = ["Passing unrecognized arguments"]
with expected_warnings(w):
obj = SuperHasTraits(a=1, b=2)
assert obj.a == 1
assert not hasattr(obj, "b")
def test_default_mro():
"""Verify that default values follow mro"""
class Base(HasTraits):
trait = Unicode("base")
attr = "base"
class A(Base):
pass
class B(Base):
trait = Unicode("B")
attr = "B"
class AB(A, B):
pass
class BA(B, A):
pass
assert A().trait == "base"
assert A().attr == "base"
assert BA().trait == "B"
assert BA().attr == "B"
assert AB().trait == "B"
assert AB().attr == "B"
def test_cls_self_argument():
class X(HasTraits):
def __init__(__self, cls, self):
pass
x = X(cls=None, self=None)
def test_override_default():
class C(HasTraits):
a = Unicode("hard default")
def _a_default(self):
return "default method"
C._a_default = lambda self: "overridden"
c = C()
assert c.a == "overridden"
def test_override_default_decorator():
class C(HasTraits):
a = Unicode("hard default")
@default("a")
def _a_default(self):
return "default method"
C._a_default = lambda self: "overridden"
c = C()
assert c.a == "overridden"
def test_override_default_instance():
class C(HasTraits):
a = Unicode("hard default")
@default("a")
def _a_default(self):
return "default method"
c = C()
c._a_default = lambda self: "overridden"
assert c.a == "overridden"
def test_copy_HasTraits():
from copy import copy
class C(HasTraits):
a = Int()
c = C(a=1)
assert c.a == 1
cc = copy(c)
cc.a = 2
assert cc.a == 2
assert c.a == 1
def _from_string_test(traittype, s, expected):
"""Run a test of trait.from_string"""
if isinstance(traittype, TraitType):
trait = traittype
else:
trait = traittype(allow_none=True)
if isinstance(s, list):
cast = trait.from_string_list
else:
cast = trait.from_string
if type(expected) is type and issubclass(expected, Exception):
with pytest.raises(expected):
value = cast(s)
trait.validate(None, value)
else:
value = cast(s)
assert value == expected
@pytest.mark.parametrize(
"s, expected",
[("xyz", "xyz"), ("1", "1"), ('"xx"', "xx"), ("'abc'", "abc"), ("None", None)],
)
def test_unicode_from_string(s, expected):
_from_string_test(Unicode, s, expected)
@pytest.mark.parametrize(
"s, expected",
[("xyz", "xyz"), ("1", "1"), ('"xx"', "xx"), ("'abc'", "abc"), ("None", None)],
)
def test_cunicode_from_string(s, expected):
_from_string_test(CUnicode, s, expected)
@pytest.mark.parametrize(
"s, expected",
[("xyz", b"xyz"), ("1", b"1"), ('b"xx"', b"xx"), ("b'abc'", b"abc"), ("None", None)],
)
def test_bytes_from_string(s, expected):
_from_string_test(Bytes, s, expected)
@pytest.mark.parametrize(
"s, expected",
[("xyz", b"xyz"), ("1", b"1"), ('b"xx"', b"xx"), ("b'abc'", b"abc"), ("None", None)],
)
def test_cbytes_from_string(s, expected):
_from_string_test(CBytes, s, expected)
@pytest.mark.parametrize(
"s, expected",
[("x", ValueError), ("1", 1), ("123", 123), ("2.0", ValueError), ("None", None)],
)
def test_int_from_string(s, expected):
_from_string_test(Integer, s, expected)
@pytest.mark.parametrize(
"s, expected",
[("x", ValueError), ("1", 1.0), ("123.5", 123.5), ("2.5", 2.5), ("None", None)],
)
def test_float_from_string(s, expected):
_from_string_test(Float, s, expected)
@pytest.mark.parametrize(
"s, expected",
[
("x", ValueError),
("1", 1.0),
("123.5", 123.5),
("2.5", 2.5),
("1+2j", 1 + 2j),
("None", None),
],
)
def test_complex_from_string(s, expected):
_from_string_test(Complex, s, expected)
@pytest.mark.parametrize(
"s, expected",
[
("true", True),
("TRUE", True),
("1", True),
("0", False),
("False", False),
("false", False),
("1.0", ValueError),
("None", None),
],
)
def test_bool_from_string(s, expected):
_from_string_test(Bool, s, expected)
@pytest.mark.parametrize(
"s, expected",
[
("{}", {}),
("1", TraitError),
("{1: 2}", {1: 2}),
('{"key": "value"}', {"key": "value"}),
("x", TraitError),
("None", None),
],
)
def test_dict_from_string(s, expected):
_from_string_test(Dict, s, expected)
@pytest.mark.parametrize(
"s, expected",
[
("[]", []),
('[1, 2, "x"]', [1, 2, "x"]),
(["1", "x"], ["1", "x"]),
(["None"], None),
],
)
def test_list_from_string(s, expected):
_from_string_test(List, s, expected)
@pytest.mark.parametrize(
"s, expected, value_trait",
[
(["1", "2", "3"], [1, 2, 3], Integer()),
(["x"], ValueError, Integer()),
(["1", "x"], ["1", "x"], Unicode()),
(["None"], [None], Unicode(allow_none=True)),
(["None"], ["None"], Unicode(allow_none=False)),
],
)
def test_list_items_from_string(s, expected, value_trait):
_from_string_test(List(value_trait), s, expected)
@pytest.mark.parametrize(
"s, expected",
[
("[]", set()),
('[1, 2, "x"]', {1, 2, "x"}),
('{1, 2, "x"}', {1, 2, "x"}),
(["1", "x"], {"1", "x"}),
(["None"], None),
],
)
def test_set_from_string(s, expected):
_from_string_test(Set, s, expected)
@pytest.mark.parametrize(
"s, expected, value_trait",
[
(["1", "2", "3"], {1, 2, 3}, Integer()),
(["x"], ValueError, Integer()),
(["1", "x"], {"1", "x"}, Unicode()),
(["None"], {None}, Unicode(allow_none=True)),
],
)
def test_set_items_from_string(s, expected, value_trait):
_from_string_test(Set(value_trait), s, expected)
@pytest.mark.parametrize(
"s, expected",
[
("[]", ()),
("()", ()),
('[1, 2, "x"]', (1, 2, "x")),
('(1, 2, "x")', (1, 2, "x")),
(["1", "x"], ("1", "x")),
(["None"], None),
],
)
def test_tuple_from_string(s, expected):
_from_string_test(Tuple, s, expected)
@pytest.mark.parametrize(
"s, expected, value_traits",
[
(["1", "2", "3"], (1, 2, 3), [Integer(), Integer(), Integer()]),
(["x"], ValueError, [Integer()]),
(["1", "x"], ("1", "x"), [Unicode()]),
(["None"], ("None",), [Unicode(allow_none=False)]),
(["None"], (None,), [Unicode(allow_none=True)]),
],
)
def test_tuple_items_from_string(s, expected, value_traits):
_from_string_test(Tuple(*value_traits), s, expected)
@pytest.mark.parametrize(
"s, expected",
[
("x", "x"),
("mod.submod", "mod.submod"),
("not an identifier", TraitError),
("1", "1"),
("None", None),
],
)
def test_object_from_string(s, expected):
_from_string_test(DottedObjectName, s, expected)
@pytest.mark.parametrize(
"s, expected",
[
("127.0.0.1:8000", ("127.0.0.1", 8000)),
("host.tld:80", ("host.tld", 80)),
("host:notaport", ValueError),
("127.0.0.1", ValueError),
("None", None),
],
)
def test_tcp_from_string(s, expected):
_from_string_test(TCPAddress, s, expected)
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