django/tests/template_tests/test_response.py

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from __future__ import unicode_literals
import os
import pickle
import time
from datetime import datetime
from django.test import RequestFactory, TestCase
from django.conf import settings
from django.template import Template, Context
from django.template.response import (TemplateResponse, SimpleTemplateResponse,
ContentNotRenderedError)
from django.test.utils import override_settings
from django.utils._os import upath
def test_processor(request):
return {'processors': 'yes'}
test_processor_name = 'template_tests.test_response.test_processor'
# A test middleware that installs a temporary URLConf
class CustomURLConfMiddleware(object):
def process_request(self, request):
request.urlconf = 'template_tests.alternate_urls'
class SimpleTemplateResponseTest(TestCase):
def _response(self, template='foo', *args, **kwargs):
return SimpleTemplateResponse(Template(template), *args, **kwargs)
def test_template_resolving(self):
response = SimpleTemplateResponse('first/test.html')
response.render()
self.assertEqual(response.content, b'First template\n')
templates = ['foo.html', 'second/test.html', 'first/test.html']
response = SimpleTemplateResponse(templates)
response.render()
self.assertEqual(response.content, b'Second template\n')
response = self._response()
response.render()
self.assertEqual(response.content, b'foo')
def test_explicit_baking(self):
# explicit baking
response = self._response()
self.assertFalse(response.is_rendered)
response.render()
self.assertTrue(response.is_rendered)
def test_render(self):
# response is not re-rendered without the render call
response = self._response().render()
self.assertEqual(response.content, b'foo')
# rebaking doesn't change the rendered content
response.template_name = Template('bar{{ baz }}')
response.render()
self.assertEqual(response.content, b'foo')
# but rendered content can be overridden by manually
# setting content
response.content = 'bar'
self.assertEqual(response.content, b'bar')
def test_iteration_unrendered(self):
# unrendered response raises an exception on iteration
response = self._response()
self.assertFalse(response.is_rendered)
def iteration():
for x in response:
pass
self.assertRaises(ContentNotRenderedError, iteration)
self.assertFalse(response.is_rendered)
def test_iteration_rendered(self):
# iteration works for rendered responses
response = self._response().render()
res = [x for x in response]
self.assertEqual(res, [b'foo'])
def test_content_access_unrendered(self):
# unrendered response raises an exception when content is accessed
response = self._response()
self.assertFalse(response.is_rendered)
self.assertRaises(ContentNotRenderedError, lambda: response.content)
self.assertFalse(response.is_rendered)
def test_content_access_rendered(self):
# rendered response content can be accessed
response = self._response().render()
self.assertEqual(response.content, b'foo')
def test_set_content(self):
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# content can be overridden
response = self._response()
self.assertFalse(response.is_rendered)
response.content = 'spam'
self.assertTrue(response.is_rendered)
self.assertEqual(response.content, b'spam')
response.content = 'baz'
self.assertEqual(response.content, b'baz')
def test_dict_context(self):
response = self._response('{{ foo }}{{ processors }}',
{'foo': 'bar'})
self.assertEqual(response.context_data, {'foo': 'bar'})
response.render()
self.assertEqual(response.content, b'bar')
def test_context_instance(self):
response = self._response('{{ foo }}{{ processors }}',
Context({'foo': 'bar'}))
self.assertEqual(response.context_data.__class__, Context)
response.render()
self.assertEqual(response.content, b'bar')
def test_kwargs(self):
response = self._response(content_type = 'application/json', status=504)
self.assertEqual(response['content-type'], 'application/json')
self.assertEqual(response.status_code, 504)
def test_args(self):
response = SimpleTemplateResponse('', {}, 'application/json', 504)
self.assertEqual(response['content-type'], 'application/json')
self.assertEqual(response.status_code, 504)
def test_post_callbacks(self):
"Rendering a template response triggers the post-render callbacks"
post = []
def post1(obj):
post.append('post1')
def post2(obj):
post.append('post2')
response = SimpleTemplateResponse('first/test.html', {})
response.add_post_render_callback(post1)
response.add_post_render_callback(post2)
# When the content is rendered, all the callbacks are invoked, too.
response.render()
self.assertEqual(response.content, b'First template\n')
self.assertEqual(post, ['post1','post2'])
def test_pickling(self):
# Create a template response. The context is
# known to be unpickleable (e.g., a function).
response = SimpleTemplateResponse('first/test.html', {
'value': 123,
'fn': datetime.now,
})
self.assertRaises(ContentNotRenderedError,
pickle.dumps, response)
# But if we render the response, we can pickle it.
response.render()
pickled_response = pickle.dumps(response)
unpickled_response = pickle.loads(pickled_response)
self.assertEqual(unpickled_response.content, response.content)
self.assertEqual(unpickled_response['content-type'], response['content-type'])
self.assertEqual(unpickled_response.status_code, response.status_code)
# ...and the unpickled reponse doesn't have the
# template-related attributes, so it can't be re-rendered
template_attrs = ('template_name', 'context_data', '_post_render_callbacks')
for attr in template_attrs:
self.assertFalse(hasattr(unpickled_response, attr))
# ...and requesting any of those attributes raises an exception
for attr in template_attrs:
with self.assertRaises(AttributeError):
getattr(unpickled_response, attr)
def test_repickling(self):
response = SimpleTemplateResponse('first/test.html', {
'value': 123,
'fn': datetime.now,
})
self.assertRaises(ContentNotRenderedError,
pickle.dumps, response)
response.render()
pickled_response = pickle.dumps(response)
unpickled_response = pickle.loads(pickled_response)
repickled_response = pickle.dumps(unpickled_response)
def test_pickling_cookie(self):
response = SimpleTemplateResponse('first/test.html', {
'value': 123,
'fn': datetime.now,
})
response.cookies['key'] = 'value'
response.render()
pickled_response = pickle.dumps(response, pickle.HIGHEST_PROTOCOL)
unpickled_response = pickle.loads(pickled_response)
self.assertEqual(unpickled_response.cookies['key'].value, 'value')
@override_settings(
TEMPLATE_CONTEXT_PROCESSORS=[test_processor_name],
TEMPLATE_DIRS=(os.path.join(os.path.dirname(upath(__file__)), 'templates')),
)
class TemplateResponseTest(TestCase):
def setUp(self):
self.factory = RequestFactory()
def _response(self, template='foo', *args, **kwargs):
return TemplateResponse(self.factory.get('/'), Template(template),
*args, **kwargs)
def test_render(self):
response = self._response('{{ foo }}{{ processors }}').render()
self.assertEqual(response.content, b'yes')
def test_render_with_requestcontext(self):
response = self._response('{{ foo }}{{ processors }}',
{'foo': 'bar'}).render()
self.assertEqual(response.content, b'baryes')
def test_render_with_context(self):
response = self._response('{{ foo }}{{ processors }}',
Context({'foo': 'bar'})).render()
self.assertEqual(response.content, b'bar')
def test_kwargs(self):
response = self._response(content_type = 'application/json',
status=504)
self.assertEqual(response['content-type'], 'application/json')
self.assertEqual(response.status_code, 504)
def test_args(self):
response = TemplateResponse(self.factory.get('/'), '', {},
'application/json', 504)
self.assertEqual(response['content-type'], 'application/json')
self.assertEqual(response.status_code, 504)
def test_custom_app(self):
response = self._response('{{ foo }}', current_app="foobar")
rc = response.resolve_context(response.context_data)
self.assertEqual(rc.current_app, 'foobar')
def test_pickling(self):
# Create a template response. The context is
# known to be unpickleable (e.g., a function).
response = TemplateResponse(self.factory.get('/'),
'first/test.html', {
'value': 123,
'fn': datetime.now,
})
self.assertRaises(ContentNotRenderedError,
pickle.dumps, response)
# But if we render the response, we can pickle it.
response.render()
pickled_response = pickle.dumps(response)
unpickled_response = pickle.loads(pickled_response)
self.assertEqual(unpickled_response.content, response.content)
self.assertEqual(unpickled_response['content-type'], response['content-type'])
self.assertEqual(unpickled_response.status_code, response.status_code)
# ...and the unpickled reponse doesn't have the
# template-related attributes, so it can't be re-rendered
template_attrs = ('template_name', 'context_data',
'_post_render_callbacks', '_request', '_current_app')
for attr in template_attrs:
self.assertFalse(hasattr(unpickled_response, attr))
# ...and requesting any of those attributes raises an exception
for attr in template_attrs:
with self.assertRaises(AttributeError):
getattr(unpickled_response, attr)
def test_repickling(self):
response = SimpleTemplateResponse('first/test.html', {
'value': 123,
'fn': datetime.now,
})
self.assertRaises(ContentNotRenderedError,
pickle.dumps, response)
response.render()
pickled_response = pickle.dumps(response)
unpickled_response = pickle.loads(pickled_response)
repickled_response = pickle.dumps(unpickled_response)
class CustomURLConfTest(TestCase):
urls = 'template_tests.urls'
def setUp(self):
self.old_MIDDLEWARE_CLASSES = settings.MIDDLEWARE_CLASSES
settings.MIDDLEWARE_CLASSES = list(settings.MIDDLEWARE_CLASSES) + [
'template_tests.test_response.CustomURLConfMiddleware'
]
def tearDown(self):
settings.MIDDLEWARE_CLASSES = self.old_MIDDLEWARE_CLASSES
def test_custom_urlconf(self):
response = self.client.get('/template_response_view/')
self.assertEqual(response.status_code, 200)
self.assertContains(response, 'This is where you can find the snark: /snark/')
class CacheMiddlewareTest(TestCase):
urls = 'template_tests.alternate_urls'
def setUp(self):
self.old_MIDDLEWARE_CLASSES = settings.MIDDLEWARE_CLASSES
self.CACHE_MIDDLEWARE_SECONDS = settings.CACHE_MIDDLEWARE_SECONDS
settings.CACHE_MIDDLEWARE_SECONDS = 2.0
settings.MIDDLEWARE_CLASSES = list(settings.MIDDLEWARE_CLASSES) + [
'django.middleware.cache.FetchFromCacheMiddleware',
'django.middleware.cache.UpdateCacheMiddleware',
]
def tearDown(self):
settings.MIDDLEWARE_CLASSES = self.old_MIDDLEWARE_CLASSES
settings.CACHE_MIDDLEWARE_SECONDS = self.CACHE_MIDDLEWARE_SECONDS
def test_middleware_caching(self):
response = self.client.get('/template_response_view/')
self.assertEqual(response.status_code, 200)
time.sleep(1.0)
response2 = self.client.get('/template_response_view/')
self.assertEqual(response2.status_code, 200)
self.assertEqual(response.content, response2.content)
time.sleep(2.0)
# Let the cache expire and test again
response2 = self.client.get('/template_response_view/')
self.assertEqual(response2.status_code, 200)
self.assertNotEqual(response.content, response2.content)