Improved cache.tests.FileBasedCacheTests.test_touch to avoid flakiness due to slow file system access.

tests/cache/tests.py

@@ -1766,6 +1766,28 @@ class FileBasedCacheTests(BaseCacheTests, TestCase):
             self.assertIs(cache.has_key("key"), False)
             mocked_open.assert_called_once()
 
+    def test_touch(self):
+        """Override to manually advance time since file access can be slow."""
+
+        class ManualTickingTime:
+            def __init__(self):
+                # Freeze time, calling `sleep` will manually advance it.
+                self._time = time.time()
+
+            def time(self):
+                return self._time
+
+            def sleep(self, seconds):
+                self._time += seconds
+
+        mocked_time = ManualTickingTime()
+        with (
+            mock.patch("django.core.cache.backends.filebased.time", new=mocked_time),
+            mock.patch("django.core.cache.backends.base.time", new=mocked_time),
+            mock.patch("cache.tests.time", new=mocked_time),
+        ):
+            super().test_touch()
+
 
 @unittest.skipUnless(RedisCache_params, "Redis backend not configured")
 @override_settings(