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# -*- coding: utf-8 -*-
from django.http import HttpRequest
from django.template import (
Context, Engine, RequestContext, Template, Variable, VariableDoesNotExist,
)
from django.template.context import RenderContext
from django.test import RequestFactory, SimpleTestCase
class ContextTests(SimpleTestCase):
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)
def test_push_context_manager(self):
c = Context({"a": 1})
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_update_context_manager(self):
c = Context({"a": 1})
with c.update({}):
c['a'] = 2
self.assertEqual(c['a'], 2)
self.assertEqual(c['a'], 1)
with c.update({'a': 3}):
self.assertEqual(c['a'], 3)
self.assertEqual(c['a'], 1)
def test_push_context_manager_with_context_object(self):
c = Context({'a': 1})
with c.push(Context({'a': 3})):
self.assertEqual(c['a'], 3)
self.assertEqual(c['a'], 1)
def test_update_context_manager_with_context_object(self):
c = Context({'a': 1})
with c.update(Context({'a': 3})):
self.assertEqual(c['a'], 3)
self.assertEqual(c['a'], 1)
def test_push_proper_layering(self):
c = Context({'a': 1})
c.push(Context({'b': 2}))
c.push(Context({'c': 3, 'd': {'z': '26'}}))
self.assertEqual(
c.dicts,
[
{'False': False, 'None': None, 'True': True},
{'a': 1},
{'b': 2},
{'c': 3, 'd': {'z': '26'}},
]
)
def test_update_proper_layering(self):
c = Context({'a': 1})
c.update(Context({'b': 2}))
c.update(Context({'c': 3, 'd': {'z': '26'}}))
self.assertEqual(
c.dicts,
[
{'False': False, 'None': None, 'True': True},
{'a': 1},
{'b': 2},
{'c': 3, 'd': {'z': '26'}},
]
)
def test_setdefault(self):
c = Context()
x = c.setdefault('x', 42)
self.assertEqual(x, 42)
self.assertEqual(c['x'], 42)
x = c.setdefault('x', 100)
self.assertEqual(x, 42)
self.assertEqual(c['x'], 42)
def test_resolve_on_context_method(self):
"""
#17778 -- Variable shouldn't resolve RequestContext methods
"""
empty_context = Context()
with self.assertRaises(VariableDoesNotExist):
Variable('no_such_variable').resolve(empty_context)
with 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_flatten_context_with_context(self):
"""
Context.push() with a Context argument should work.
"""
a = Context({'a': 2})
a.push(Context({'z': '8'}))
self.assertEqual(a.flatten(), {
'False': False,
'None': None,
'True': True,
'a': 2,
'z': '8',
})
def test_context_comparable(self):
"""
#21765 -- equality comparison should work
"""
test_data = {'x': 'y', 'v': 'z', 'd': {'o': object, 'a': 'b'}}
self.assertEqual(Context(test_data), Context(test_data))
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)
def test_copy_request_context_twice(self):
"""
#24273 -- Copy twice shouldn't raise an exception
"""
RequestContext(HttpRequest()).new().new()
class RequestContextTests(SimpleTestCase):
def test_include_only(self):
"""
#15721 -- ``{% include %}`` and ``RequestContext`` should work
together.
"""
engine = Engine(loaders=[
('django.template.loaders.locmem.Loader', {
'child': '{{ var|default:"none" }}',
}),
])
request = RequestFactory().get('/')
ctx = RequestContext(request, {'var': 'parent'})
self.assertEqual(engine.from_string('{% include "child" %}').render(ctx), 'parent')
self.assertEqual(engine.from_string('{% include "child" only %}').render(ctx), 'none')
def test_stack_size(self):
"""
#7116 -- Optimize RequetsContext construction
"""
request = RequestFactory().get('/')
ctx = RequestContext(request, {})
# The stack should now contain 3 items:
# [builtins, supplied context, context processor, empty dict]
self.assertEqual(len(ctx.dicts), 4)
def test_context_comparable(self):
# Create an engine without any context processors.
test_data = {'x': 'y', 'v': 'z', 'd': {'o': object, 'a': 'b'}}
# test comparing RequestContext to prevent problems if somebody
# adds __eq__ in the future
request = RequestFactory().get('/')
self.assertEqual(
RequestContext(request, dict_=test_data),
RequestContext(request, dict_=test_data),
)
def test_modify_context_and_render(self):
template = Template('{{ foo }}')
request = RequestFactory().get('/')
context = RequestContext(request, {})
context['foo'] = 'foo'
self.assertEqual(template.render(context), 'foo')
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