Files
edx-platform/common/djangoapps/request_cache/tests.py

250 lines
8.8 KiB
Python

# -*- coding: utf-8 -*-
"""
Tests for the request cache.
"""
from celery.task import task
from django.conf import settings
from django.test import TestCase
from django.test.utils import override_settings
from mock import Mock
from request_cache import get_request_or_stub
from request_cache.middleware import RequestCache, request_cached
from xmodule.modulestore.django import modulestore
class TestRequestCache(TestCase):
"""
Tests for the request cache.
"""
def test_get_request_or_stub(self):
"""
Outside the context of the request, we should still get a request
that allows us to build an absolute URI.
"""
stub = get_request_or_stub()
expected_url = "http://{site_name}/foobar".format(site_name=settings.SITE_NAME)
self.assertEqual(stub.build_absolute_uri("foobar"), expected_url)
@task
def _dummy_task(self):
""" Create a task that adds stuff to the request cache. """
cache = {"course_cache": "blah blah blah"}
modulestore().request_cache.data.update(cache)
@override_settings(CLEAR_REQUEST_CACHE_ON_TASK_COMPLETION=True)
def test_clear_cache_celery(self):
""" Test that the request cache is cleared after a task is run. """
self._dummy_task.apply(args=(self,)).get()
self.assertEqual(modulestore().request_cache.data, {})
def test_request_cached_miss_and_then_hit(self):
"""
Ensure that after a cache miss, we fill the cache and can hit it.
"""
RequestCache.clear_request_cache()
to_be_wrapped = Mock()
to_be_wrapped.return_value = 42
self.assertEqual(to_be_wrapped.call_count, 0)
def mock_wrapper(*args, **kwargs):
"""Simple wrapper to let us decorate our mock."""
return to_be_wrapped(*args, **kwargs)
wrapped = request_cached(mock_wrapper)
result = wrapped()
self.assertEqual(result, 42)
self.assertEqual(to_be_wrapped.call_count, 1)
result = wrapped()
self.assertEqual(result, 42)
self.assertEqual(to_be_wrapped.call_count, 1)
def test_request_cached_with_caches_despite_changing_wrapped_result(self):
"""
Ensure that after caching a result, we always send it back, even if the underlying result changes.
"""
RequestCache.clear_request_cache()
to_be_wrapped = Mock()
to_be_wrapped.side_effect = [1, 2, 3]
self.assertEqual(to_be_wrapped.call_count, 0)
def mock_wrapper(*args, **kwargs):
"""Simple wrapper to let us decorate our mock."""
return to_be_wrapped(*args, **kwargs)
wrapped = request_cached(mock_wrapper)
result = wrapped()
self.assertEqual(result, 1)
self.assertEqual(to_be_wrapped.call_count, 1)
result = wrapped()
self.assertEqual(result, 1)
self.assertEqual(to_be_wrapped.call_count, 1)
direct_result = mock_wrapper()
self.assertEqual(direct_result, 2)
self.assertEqual(to_be_wrapped.call_count, 2)
result = wrapped()
self.assertEqual(result, 1)
self.assertEqual(to_be_wrapped.call_count, 2)
direct_result = mock_wrapper()
self.assertEqual(direct_result, 3)
self.assertEqual(to_be_wrapped.call_count, 3)
def test_request_cached_with_changing_args(self):
"""
Ensure that calling a decorated function with different positional arguments
will not use a cached value invoked by a previous call with different arguments.
"""
RequestCache.clear_request_cache()
to_be_wrapped = Mock()
to_be_wrapped.side_effect = [1, 2, 3, 4, 5, 6]
self.assertEqual(to_be_wrapped.call_count, 0)
def mock_wrapper(*args, **kwargs):
"""Simple wrapper to let us decorate our mock."""
return to_be_wrapped(*args, **kwargs)
wrapped = request_cached(mock_wrapper)
# This will be a miss, and make an underlying call.
result = wrapped(1)
self.assertEqual(result, 1)
self.assertEqual(to_be_wrapped.call_count, 1)
# This will be a miss, and make an underlying call.
result = wrapped(2)
self.assertEqual(result, 2)
self.assertEqual(to_be_wrapped.call_count, 2)
# This is bypass of the decorator.
direct_result = mock_wrapper(3)
self.assertEqual(direct_result, 3)
self.assertEqual(to_be_wrapped.call_count, 3)
# These will be hits, and not make an underlying call.
result = wrapped(1)
self.assertEqual(result, 1)
self.assertEqual(to_be_wrapped.call_count, 3)
result = wrapped(2)
self.assertEqual(result, 2)
self.assertEqual(to_be_wrapped.call_count, 3)
def test_request_cached_with_changing_kwargs(self):
"""
Ensure that calling a decorated function with different keyword arguments
will not use a cached value invoked by a previous call with different arguments.
"""
RequestCache.clear_request_cache()
to_be_wrapped = Mock()
to_be_wrapped.side_effect = [1, 2, 3, 4, 5, 6]
self.assertEqual(to_be_wrapped.call_count, 0)
def mock_wrapper(*args, **kwargs):
"""Simple wrapper to let us decorate our mock."""
return to_be_wrapped(*args, **kwargs)
wrapped = request_cached(mock_wrapper)
# This will be a miss, and make an underlying call.
result = wrapped(1, foo=1)
self.assertEqual(result, 1)
self.assertEqual(to_be_wrapped.call_count, 1)
# This will be a miss, and make an underlying call.
result = wrapped(2, foo=2)
self.assertEqual(result, 2)
self.assertEqual(to_be_wrapped.call_count, 2)
# This is bypass of the decorator.
direct_result = mock_wrapper(3, foo=3)
self.assertEqual(direct_result, 3)
self.assertEqual(to_be_wrapped.call_count, 3)
# These will be hits, and not make an underlying call.
result = wrapped(1, foo=1)
self.assertEqual(result, 1)
self.assertEqual(to_be_wrapped.call_count, 3)
result = wrapped(2, foo=2)
self.assertEqual(result, 2)
self.assertEqual(to_be_wrapped.call_count, 3)
# Since we're changing foo, this will be a miss.
result = wrapped(2, foo=5)
self.assertEqual(result, 4)
self.assertEqual(to_be_wrapped.call_count, 4)
def test_request_cached_mixed_unicode_str_args(self):
"""
Ensure that request_cached can work with mixed str and Unicode parameters.
"""
RequestCache.clear_request_cache()
def dummy_function(arg1, arg2):
"""
A dummy function that expects an str and unicode arguments.
"""
assert isinstance(arg1, str), 'First parameter has to be of type `str`'
assert isinstance(arg2, unicode), 'Second parameter has to be of type `unicode`'
return True
self.assertTrue(dummy_function('Hello', u'World'), 'Should be callable with ASCII chars')
self.assertTrue(dummy_function('H∂llå', u'Wørld'), 'Should be callable with non-ASCII chars')
wrapped = request_cached(dummy_function)
self.assertTrue(wrapped('Hello', u'World'), 'Wrapper should handle ASCII only chars')
self.assertTrue(wrapped('H∂llå', u'Wørld'), 'Wrapper should handle non-ASCII chars')
def test_request_cached_with_none_result(self):
"""
Ensure that calling a decorated function that returns None
properly caches the result and doesn't recall the underlying
function.
"""
RequestCache.clear_request_cache()
to_be_wrapped = Mock()
to_be_wrapped.side_effect = [None, None, None, 1, 1]
self.assertEqual(to_be_wrapped.call_count, 0)
def mock_wrapper(*args, **kwargs):
"""Simple wrapper to let us decorate our mock."""
return to_be_wrapped(*args, **kwargs)
wrapped = request_cached(mock_wrapper)
# This will be a miss, and make an underlying call.
result = wrapped(1)
self.assertEqual(result, None)
self.assertEqual(to_be_wrapped.call_count, 1)
# This will be a miss, and make an underlying call.
result = wrapped(2)
self.assertEqual(result, None)
self.assertEqual(to_be_wrapped.call_count, 2)
# This is bypass of the decorator.
direct_result = mock_wrapper(3)
self.assertEqual(direct_result, None)
self.assertEqual(to_be_wrapped.call_count, 3)
# These will be hits, and not make an underlying call.
result = wrapped(1)
self.assertEqual(result, None)
self.assertEqual(to_be_wrapped.call_count, 3)
result = wrapped(2)
self.assertEqual(result, None)
self.assertEqual(to_be_wrapped.call_count, 3)