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from __future__ import annotations
from inspect import Parameter, signature
from unittest import TestCase
from traitlets import HasTraits, Int, Unicode
from traitlets.utils.decorators import signature_has_traits
class TestExpandSignature(TestCase):
def test_no_init(self):
@signature_has_traits
class Foo(HasTraits):
number1 = Int()
number2 = Int()
value = Unicode("Hello")
parameters = signature(Foo).parameters
parameter_names = list(parameters)
self.assertIs(parameters["args"].kind, Parameter.VAR_POSITIONAL)
self.assertEqual("args", parameter_names[0])
self.assertIs(parameters["number1"].kind, Parameter.KEYWORD_ONLY)
self.assertIs(parameters["number2"].kind, Parameter.KEYWORD_ONLY)
self.assertIs(parameters["value"].kind, Parameter.KEYWORD_ONLY)
self.assertIs(parameters["kwargs"].kind, Parameter.VAR_KEYWORD)
self.assertEqual("kwargs", parameter_names[-1])
f = Foo(number1=32, value="World")
self.assertEqual(f.number1, 32)
self.assertEqual(f.number2, 0)
self.assertEqual(f.value, "World")
def test_partial_init(self):
@signature_has_traits
class Foo(HasTraits):
number1 = Int()
number2 = Int()
value = Unicode("Hello")
def __init__(self, arg1, **kwargs):
self.arg1 = arg1
super().__init__(**kwargs)
parameters = signature(Foo).parameters
parameter_names = list(parameters)
self.assertIs(parameters["arg1"].kind, Parameter.POSITIONAL_OR_KEYWORD)
self.assertEqual("arg1", parameter_names[0])
self.assertIs(parameters["number1"].kind, Parameter.KEYWORD_ONLY)
self.assertIs(parameters["number2"].kind, Parameter.KEYWORD_ONLY)
self.assertIs(parameters["value"].kind, Parameter.KEYWORD_ONLY)
self.assertIs(parameters["kwargs"].kind, Parameter.VAR_KEYWORD)
self.assertEqual("kwargs", parameter_names[-1])
f = Foo(1, number1=32, value="World")
self.assertEqual(f.arg1, 1)
self.assertEqual(f.number1, 32)
self.assertEqual(f.number2, 0)
self.assertEqual(f.value, "World")
def test_duplicate_init(self):
@signature_has_traits
class Foo(HasTraits):
number1 = Int()
number2 = Int()
def __init__(self, number1, **kwargs):
self.test = number1
super().__init__(number1=number1, **kwargs)
parameters = signature(Foo).parameters
parameter_names = list(parameters)
self.assertListEqual(parameter_names, ["number1", "number2", "kwargs"])
f = Foo(number1=32, number2=36)
self.assertEqual(f.test, 32)
self.assertEqual(f.number1, 32)
self.assertEqual(f.number2, 36)
def test_full_init(self):
@signature_has_traits
class Foo(HasTraits):
number1 = Int()
number2 = Int()
value = Unicode("Hello")
def __init__(self, arg1, arg2=None, *pos_args, **kw_args):
self.arg1 = arg1
self.arg2 = arg2
self.pos_args = pos_args
self.kw_args = kw_args
super().__init__(*pos_args, **kw_args)
parameters = signature(Foo).parameters
parameter_names = list(parameters)
self.assertIs(parameters["arg1"].kind, Parameter.POSITIONAL_OR_KEYWORD)
self.assertEqual("arg1", parameter_names[0])
self.assertIs(parameters["arg2"].kind, Parameter.POSITIONAL_OR_KEYWORD)
self.assertEqual("arg2", parameter_names[1])
self.assertIs(parameters["pos_args"].kind, Parameter.VAR_POSITIONAL)
self.assertEqual("pos_args", parameter_names[2])
self.assertIs(parameters["number1"].kind, Parameter.KEYWORD_ONLY)
self.assertIs(parameters["number2"].kind, Parameter.KEYWORD_ONLY)
self.assertIs(parameters["value"].kind, Parameter.KEYWORD_ONLY)
self.assertIs(parameters["kw_args"].kind, Parameter.VAR_KEYWORD)
self.assertEqual("kw_args", parameter_names[-1])
f = Foo(1, 3, 45, "hey", number1=32, value="World")
self.assertEqual(f.arg1, 1)
self.assertEqual(f.arg2, 3)
self.assertTupleEqual(f.pos_args, (45, "hey"))
self.assertEqual(f.number1, 32)
self.assertEqual(f.number2, 0)
self.assertEqual(f.value, "World")
def test_no_kwargs(self):
with self.assertRaises(RuntimeError):
@signature_has_traits
class Foo(HasTraits):
number1 = Int()
number2 = Int()
def __init__(self, arg1, arg2=None):
pass
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