晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/lib/python3.6/site-packages/jsonschema/tests/test_format.py
"""
Tests for the parts of jsonschema related to the :validator:`format` property.

"""

from jsonschema.tests.compat import mock, unittest

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


class TestFormatChecker(unittest.TestCase):
    def setUp(self):
        self.fn = mock.Mock()

    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):
        with mock.patch.dict(FormatChecker.checkers, clear=True):
            FormatChecker.cls_checks("new")(self.fn)
            self.assertEqual(FormatChecker.checkers, {"new": (self.fn, ())})

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

    def test_it_catches_registered_errors(self):
        checker = FormatChecker()
        cause = self.fn.side_effect = ValueError()

        checker.checks("foo", raises=ValueError)(self.fn)

        with self.assertRaises(FormatError) as cm:
            checker.check("bar", "foo")

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

        # Unregistered errors should not be caught
        self.fn.side_effect = AttributeError
        with self.assertRaises(AttributeError):
            checker.check("bar", "foo")

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

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

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

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