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import asyncio
from django.core.cache import CacheKeyWarning, cache
from django.test import SimpleTestCase, override_settings
from .tests import KEY_ERRORS_WITH_MEMCACHED_MSG
@override_settings(
CACHES={
"default": {
"BACKEND": "django.core.cache.backends.dummy.DummyCache",
}
}
)
class AsyncDummyCacheTests(SimpleTestCase):
async def test_simple(self):
"""Dummy cache backend ignores cache set calls."""
await cache.aset("key", "value")
self.assertIsNone(await cache.aget("key"))
async def test_aadd(self):
"""Add doesn't do anything in dummy cache backend."""
self.assertIs(await cache.aadd("key", "value"), True)
self.assertIs(await cache.aadd("key", "new_value"), True)
self.assertIsNone(await cache.aget("key"))
async def test_non_existent(self):
"""Nonexistent keys aren't found in the dummy cache backend."""
self.assertIsNone(await cache.aget("does_not_exist"))
self.assertEqual(await cache.aget("does_not_exist", "default"), "default")
async def test_aget_many(self):
"""aget_many() returns nothing for the dummy cache backend."""
await cache.aset_many({"a": "a", "b": "b", "c": "c", "d": "d"})
self.assertEqual(await cache.aget_many(["a", "c", "d"]), {})
self.assertEqual(await cache.aget_many(["a", "b", "e"]), {})
async def test_aget_many_invalid_key(self):
msg = KEY_ERRORS_WITH_MEMCACHED_MSG % ":1:key with spaces"
with self.assertWarnsMessage(CacheKeyWarning, msg):
await cache.aget_many(["key with spaces"])
async def test_adelete(self):
"""
Cache deletion is transparently ignored on the dummy cache backend.
"""
await cache.aset_many({"key1": "spam", "key2": "eggs"})
self.assertIsNone(await cache.aget("key1"))
self.assertIs(await cache.adelete("key1"), False)
self.assertIsNone(await cache.aget("key1"))
self.assertIsNone(await cache.aget("key2"))
async def test_ahas_key(self):
"""ahas_key() doesn't ever return True for the dummy cache backend."""
await cache.aset("hello1", "goodbye1")
self.assertIs(await cache.ahas_key("hello1"), False)
self.assertIs(await cache.ahas_key("goodbye1"), False)
async def test_aincr(self):
"""Dummy cache values can't be incremented."""
await cache.aset("answer", 42)
with self.assertRaises(ValueError):
await cache.aincr("answer")
with self.assertRaises(ValueError):
await cache.aincr("does_not_exist")
with self.assertRaises(ValueError):
await cache.aincr("does_not_exist", -1)
async def test_adecr(self):
"""Dummy cache values can't be decremented."""
await cache.aset("answer", 42)
with self.assertRaises(ValueError):
await cache.adecr("answer")
with self.assertRaises(ValueError):
await cache.adecr("does_not_exist")
with self.assertRaises(ValueError):
await cache.adecr("does_not_exist", -1)
async def test_atouch(self):
self.assertIs(await cache.atouch("key"), False)
async def test_data_types(self):
"""All data types are ignored equally by the dummy cache."""
def f():
return 42
class C:
def m(n):
return 24
data = {
"string": "this is a string",
"int": 42,
"list": [1, 2, 3, 4],
"tuple": (1, 2, 3, 4),
"dict": {"A": 1, "B": 2},
"function": f,
"class": C,
}
await cache.aset("data", data)
self.assertIsNone(await cache.aget("data"))
async def test_expiration(self):
"""Expiration has no effect on the dummy cache."""
await cache.aset("expire1", "very quickly", 1)
await cache.aset("expire2", "very quickly", 1)
await cache.aset("expire3", "very quickly", 1)
await asyncio.sleep(2)
self.assertIsNone(await cache.aget("expire1"))
self.assertIs(await cache.aadd("expire2", "new_value"), True)
self.assertIsNone(await cache.aget("expire2"))
self.assertIs(await cache.ahas_key("expire3"), False)
async def test_unicode(self):
"""Unicode values are ignored by the dummy cache."""
tests = {
"ascii": "ascii_value",
"unicode_ascii": "Iñtërnâtiônàlizætiøn1",
"Iñtërnâtiônàlizætiøn": "Iñtërnâtiônàlizætiøn2",
"ascii2": {"x": 1},
}
for key, value in tests.items():
with self.subTest(key=key):
await cache.aset(key, value)
self.assertIsNone(await cache.aget(key))
async def test_aset_many(self):
"""aset_many() does nothing for the dummy cache backend."""
self.assertEqual(await cache.aset_many({"a": 1, "b": 2}), [])
self.assertEqual(
await cache.aset_many({"a": 1, "b": 2}, timeout=2, version="1"),
[],
)
async def test_aset_many_invalid_key(self):
msg = KEY_ERRORS_WITH_MEMCACHED_MSG % ":1:key with spaces"
with self.assertWarnsMessage(CacheKeyWarning, msg):
await cache.aset_many({"key with spaces": "foo"})
async def test_adelete_many(self):
"""adelete_many() does nothing for the dummy cache backend."""
await cache.adelete_many(["a", "b"])
async def test_adelete_many_invalid_key(self):
msg = KEY_ERRORS_WITH_MEMCACHED_MSG % ":1:key with spaces"
with self.assertWarnsMessage(CacheKeyWarning, msg):
await cache.adelete_many({"key with spaces": "foo"})
async def test_aclear(self):
"""aclear() does nothing for the dummy cache backend."""
await cache.aclear()
async def test_aclose(self):
"""aclose() does nothing for the dummy cache backend."""
await cache.aclose()
async def test_aincr_version(self):
"""Dummy cache versions can't be incremented."""
await cache.aset("answer", 42)
with self.assertRaises(ValueError):
await cache.aincr_version("answer")
with self.assertRaises(ValueError):
await cache.aincr_version("answer", version=2)
with self.assertRaises(ValueError):
await cache.aincr_version("does_not_exist")
async def test_adecr_version(self):
"""Dummy cache versions can't be decremented."""
await cache.aset("answer", 42)
with self.assertRaises(ValueError):
await cache.adecr_version("answer")
with self.assertRaises(ValueError):
await cache.adecr_version("answer", version=2)
with self.assertRaises(ValueError):
await cache.adecr_version("does_not_exist")
async def test_aget_or_set(self):
self.assertEqual(await cache.aget_or_set("key", "default"), "default")
self.assertIsNone(await cache.aget_or_set("key", None))
async def test_aget_or_set_callable(self):
def my_callable():
return "default"
self.assertEqual(await cache.aget_or_set("key", my_callable), "default")
self.assertEqual(await cache.aget_or_set("key", my_callable()), "default")
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