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Current File : /lib/python3/dist-packages/jsonschema/tests//test_format.py
"""
Tests for the parts of jsonschema related to the :validator:`format` property.
"""

from unittest import TestCase

from jsonschema import FormatError, ValidationError, FormatChecker
from jsonschema.validators import Draft4Validator


BOOM = ValueError("Boom!")
BANG = ZeroDivisionError("Bang!")


def boom(thing):
    if thing == "bang":
        raise BANG
    raise BOOM


class TestFormatChecker(TestCase):
    def test_it_can_validate_no_formats(self):
        checker = FormatChecker(formats=())
        self.assertFalse(checker.checkers)

    def test_it_raises_a_key_error_for_unknown_formats(self):
        with self.assertRaises(KeyError):
            FormatChecker(formats=["o noes"])

    def test_it_can_register_cls_checkers(self):
        original = dict(FormatChecker.checkers)
        self.addCleanup(FormatChecker.checkers.pop, "boom")
        FormatChecker.cls_checks("boom")(boom)
        self.assertEqual(
            FormatChecker.checkers,
            dict(original, boom=(boom, ())),
        )

    def test_it_can_register_checkers(self):
        checker = FormatChecker()
        checker.checks("boom")(boom)
        self.assertEqual(
            checker.checkers,
            dict(FormatChecker.checkers, boom=(boom, ()))
        )

    def test_it_catches_registered_errors(self):
        checker = FormatChecker()
        checker.checks("boom", raises=type(BOOM))(boom)

        with self.assertRaises(FormatError) as cm:
            checker.check(instance=12, format="boom")

        self.assertIs(cm.exception.cause, BOOM)
        self.assertIs(cm.exception.__cause__, BOOM)

        # Unregistered errors should not be caught
        with self.assertRaises(type(BANG)):
            checker.check(instance="bang", format="boom")

    def test_format_error_causes_become_validation_error_causes(self):
        checker = FormatChecker()
        checker.checks("boom", raises=ValueError)(boom)
        validator = Draft4Validator({"format": "boom"}, format_checker=checker)

        with self.assertRaises(ValidationError) as cm:
            validator.validate("BOOM")

        self.assertIs(cm.exception.cause, BOOM)
        self.assertIs(cm.exception.__cause__, BOOM)

    def test_format_checkers_come_with_defaults(self):
        # This is bad :/ but relied upon.
        # The docs for quite awhile recommended people do things like
        # validate(..., format_checker=FormatChecker())
        # We should change that, but we can't without deprecation...
        checker = FormatChecker()
        with self.assertRaises(FormatError):
            checker.check(instance="not-an-ipv4", format="ipv4")

    def test_repr(self):
        checker = FormatChecker(formats=())
        checker.checks("foo")(lambda thing: True)
        checker.checks("bar")(lambda thing: True)
        checker.checks("baz")(lambda thing: True)
        self.assertEqual(
            repr(checker),
            "<FormatChecker checkers=['bar', 'baz', 'foo']>",
        )

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