Fixed #8

Fixed #12
Fixed #13
Fixed #14

tests/caching/__init__.py

@@ -0,0 +1,18 @@
+class FakeSdp:
+    def __init__(self, /, get_value=None, extend_exists=None, get_alt_value=None, populate=None):
+        self.get_value = get_value
+        self.extend_exists = extend_exists
+        self.populate_function = populate
+        self.get_alt_value = get_alt_value
+
+    def get(self, cache_name, key):
+        return self.get_value(cache_name, key)
+
+    def exists(self, cache_name, key):
+        return self.extend_exists(cache_name, key)
+
+    def alt_get(self, cache_name, key):
+        return self.get_alt_value(cache_name, key)
+
+    def populate(self):
+        return self.populate_function() if callable(self.populate_function) else self.populate_function