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"""
Tests for the `TypeChecker`-based type interface.
The actual correctness of the type checking is handled in
`test_jsonschema_test_suite`; these tests check that TypeChecker
functions correctly at a more granular level.
"""
from collections import namedtuple
from unittest import TestCase
from jsonschema import ValidationError, _keywords
from jsonschema._types import TypeChecker
from jsonschema.exceptions import UndefinedTypeCheck, UnknownType
from jsonschema.validators import Draft202012Validator, extend
def equals_2(checker, instance):
return instance == 2
def is_namedtuple(instance):
return isinstance(instance, tuple) and getattr(instance, "_fields", None)
def is_object_or_named_tuple(checker, instance):
if Draft202012Validator.TYPE_CHECKER.is_type(instance, "object"):
return True
return is_namedtuple(instance)
class TestTypeChecker(TestCase):
def test_is_type(self):
checker = TypeChecker({"two": equals_2})
self.assertEqual(
(
checker.is_type(instance=2, type="two"),
checker.is_type(instance="bar", type="two"),
),
(True, False),
)
def test_is_unknown_type(self):
with self.assertRaises(UndefinedTypeCheck) as e:
TypeChecker().is_type(4, "foobar")
self.assertIn(
"'foobar' is unknown to this type checker",
str(e.exception),
)
self.assertTrue(
e.exception.__suppress_context__,
msg="Expected the internal KeyError to be hidden.",
)
def test_checks_can_be_added_at_init(self):
checker = TypeChecker({"two": equals_2})
self.assertEqual(checker, TypeChecker().redefine("two", equals_2))
def test_redefine_existing_type(self):
self.assertEqual(
TypeChecker().redefine("two", object()).redefine("two", equals_2),
TypeChecker().redefine("two", equals_2),
)
def test_remove(self):
self.assertEqual(
TypeChecker({"two": equals_2}).remove("two"),
TypeChecker(),
)
def test_remove_unknown_type(self):
with self.assertRaises(UndefinedTypeCheck) as context:
TypeChecker().remove("foobar")
self.assertIn("foobar", str(context.exception))
def test_redefine_many(self):
self.assertEqual(
TypeChecker().redefine_many({"foo": int, "bar": str}),
TypeChecker().redefine("foo", int).redefine("bar", str),
)
def test_remove_multiple(self):
self.assertEqual(
TypeChecker({"foo": int, "bar": str}).remove("foo", "bar"),
TypeChecker(),
)
def test_type_check_can_raise_key_error(self):
"""
Make sure no one writes:
try:
self._type_checkers[type](...)
except KeyError:
ignoring the fact that the function itself can raise that.
"""
error = KeyError("Stuff")
def raises_keyerror(checker, instance):
raise error
with self.assertRaises(KeyError) as context:
TypeChecker({"foo": raises_keyerror}).is_type(4, "foo")
self.assertIs(context.exception, error)
def test_repr(self):
checker = TypeChecker({"foo": is_namedtuple, "bar": is_namedtuple})
self.assertEqual(repr(checker), "<TypeChecker types={'bar', 'foo'}>")
class TestCustomTypes(TestCase):
def test_simple_type_can_be_extended(self):
def int_or_str_int(checker, instance):
if not isinstance(instance, (int, str)):
return False
try:
int(instance)
except ValueError:
return False
return True
CustomValidator = extend(
Draft202012Validator,
type_checker=Draft202012Validator.TYPE_CHECKER.redefine(
"integer", int_or_str_int,
),
)
validator = CustomValidator({"type": "integer"})
validator.validate(4)
validator.validate("4")
with self.assertRaises(ValidationError):
validator.validate(4.4)
with self.assertRaises(ValidationError):
validator.validate("foo")
def test_object_can_be_extended(self):
schema = {"type": "object"}
Point = namedtuple("Point", ["x", "y"])
type_checker = Draft202012Validator.TYPE_CHECKER.redefine(
"object", is_object_or_named_tuple,
)
CustomValidator = extend(
Draft202012Validator,
type_checker=type_checker,
)
validator = CustomValidator(schema)
validator.validate(Point(x=4, y=5))
def test_object_extensions_require_custom_validators(self):
schema = {"type": "object", "required": ["x"]}
type_checker = Draft202012Validator.TYPE_CHECKER.redefine(
"object", is_object_or_named_tuple,
)
CustomValidator = extend(
Draft202012Validator,
type_checker=type_checker,
)
validator = CustomValidator(schema)
Point = namedtuple("Point", ["x", "y"])
# Cannot handle required
with self.assertRaises(ValidationError):
validator.validate(Point(x=4, y=5))
def test_object_extensions_can_handle_custom_validators(self):
schema = {
"type": "object",
"required": ["x"],
"properties": {"x": {"type": "integer"}},
}
type_checker = Draft202012Validator.TYPE_CHECKER.redefine(
"object", is_object_or_named_tuple,
)
def coerce_named_tuple(fn):
def coerced(validator, value, instance, schema):
if is_namedtuple(instance):
instance = instance._asdict()
return fn(validator, value, instance, schema)
return coerced
required = coerce_named_tuple(_keywords.required)
properties = coerce_named_tuple(_keywords.properties)
CustomValidator = extend(
Draft202012Validator,
type_checker=type_checker,
validators={"required": required, "properties": properties},
)
validator = CustomValidator(schema)
Point = namedtuple("Point", ["x", "y"])
# Can now process required and properties
validator.validate(Point(x=4, y=5))
with self.assertRaises(ValidationError):
validator.validate(Point(x="not an integer", y=5))
# As well as still handle objects.
validator.validate({"x": 4, "y": 5})
with self.assertRaises(ValidationError):
validator.validate({"x": "not an integer", "y": 5})
def test_unknown_type(self):
with self.assertRaises(UnknownType) as e:
Draft202012Validator({}).is_type(12, "some unknown type")
self.assertIn("'some unknown type'", str(e.exception))
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