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#!/usr/bin/env python
from . import unittest
from datetime import datetime, timedelta
import json
import jmespath
from jmespath import exceptions
class TestFunctions(unittest.TestCase):
def test_can_max_datetimes(self):
# This is python specific behavior, but JMESPath does not specify what
# you should do with language specific types. We're going to add the
# ability that ``to_string`` will always default to str()'ing values it
# doesn't understand.
data = [datetime.now(), datetime.now() + timedelta(seconds=1)]
result = jmespath.search('max([*].to_string(@))', data)
self.assertEqual(json.loads(result), str(data[-1]))
def test_type_error_messages(self):
with self.assertRaises(exceptions.JMESPathTypeError) as e:
jmespath.search('length(@)', 2)
exception = e.exception
# 1. Function name should be in error message
self.assertIn('length()', str(exception))
# 2. Mention it's an invalid type
self.assertIn('invalid type for value: 2', str(exception))
# 3. Mention the valid types:
self.assertIn("expected one of: ['string', 'array', 'object']",
str(exception))
# 4. Mention the actual type.
self.assertIn('received: "number"', str(exception))
def test_singular_in_error_message(self):
with self.assertRaises(exceptions.ArityError) as e:
jmespath.search('length(@, @)', [0, 1])
exception = e.exception
self.assertEqual(
str(exception),
'Expected 1 argument for function length(), received 2')
def test_error_message_is_pluralized(self):
with self.assertRaises(exceptions.ArityError) as e:
jmespath.search('sort_by(@)', [0, 1])
exception = e.exception
self.assertEqual(
str(exception),
'Expected 2 arguments for function sort_by(), received 1')
def test_variadic_is_pluralized(self):
with self.assertRaises(exceptions.VariadictArityError) as e:
jmespath.search('not_null()', 'foo')
exception = e.exception
self.assertEqual(
str(exception),
'Expected at least 1 argument for function not_null(), received 0')
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