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# -*- coding: utf-8 -*-
from unittest import TestCase
from django.template import Context, Variable, VariableDoesNotExist
from django.template.context import RenderContext
class ContextTests(TestCase):
def test_context(self):
c = Context({"a": 1, "b": "xyzzy"})
self.assertEqual(c["a"], 1)
self.assertEqual(c.push(), {})
c["a"] = 2
self.assertEqual(c["a"], 2)
self.assertEqual(c.get("a"), 2)
self.assertEqual(c.pop(), {"a": 2})
self.assertEqual(c["a"], 1)
self.assertEqual(c.get("foo", 42), 42)
with c.push():
c['a'] = 2
self.assertEqual(c['a'], 2)
self.assertEqual(c['a'], 1)
with c.push(a=3):
self.assertEqual(c['a'], 3)
self.assertEqual(c['a'], 1)
def test_resolve_on_context_method(self):
# Regression test for #17778
empty_context = Context()
self.assertRaises(VariableDoesNotExist,
Variable('no_such_variable').resolve, empty_context)
self.assertRaises(VariableDoesNotExist,
Variable('new').resolve, empty_context)
self.assertEqual(Variable('new').resolve(Context({'new': 'foo'})), 'foo')
def test_render_context(self):
test_context = RenderContext({'fruit': 'papaya'})
# Test that push() limits access to the topmost dict
test_context.push()
test_context['vegetable'] = 'artichoke'
self.assertEqual(list(test_context), ['vegetable'])
self.assertNotIn('fruit', test_context)
with self.assertRaises(KeyError):
test_context['fruit']
self.assertIsNone(test_context.get('fruit'))
def test_flatten_context(self):
a = Context()
a.update({'a': 2})
a.update({'b': 4})
a.update({'c': 8})
self.assertEqual(a.flatten(), {
'False': False, 'None': None, 'True': True,
'a': 2, 'b': 4, 'c': 8
})
def test_context_comparable(self):
test_data = {'x': 'y', 'v': 'z', 'd': {'o': object, 'a': 'b'}}
self.assertEqual(Context(test_data), Context(test_data))
# Regression test for #21765
a = Context()
b = Context()
self.assertEqual(a, b)
# update only a
a.update({'a': 1})
self.assertNotEqual(a, b)
# update both to check regression
a.update({'c': 3})
b.update({'c': 3})
self.assertNotEqual(a, b)
# make contexts equals again
b.update({'a': 1})
self.assertEqual(a, b)
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