add test for SingleSingletonStore

mex/common/context.py

@@ -52,7 +52,7 @@ def load(self, cls: type[_SingletonT]) -> _SingletonT:
             return self._singleton
         if not issubclass(type(self._singleton), cls):
             raise TypeError(
-                f"requested class ({cls}) is not not a parent class of loaded class "
+                f"requested class ({cls}) is not a parent class of loaded class "
                 f"({type(self._singleton)}). "
                 f"Did you initialize {cls} upon startup?"
             )

tests/test_context.py

@@ -0,0 +1,31 @@
+import pytest
+
+from mex.common.context import SingleSingletonStore
+
+
+class Parent:
+    pass
+
+
+class Child(Parent):
+    pass
+
+
+def test_single_singleton_store() -> None:
+    store = SingleSingletonStore["Parent"]()
+    parent = store.load(Parent)
+
+    with pytest.raises(TypeError, match="is not a parent class of loaded class"):
+        store.load(Child)
+
+    assert parent is store.load(Parent)
+
+    store.push(Child())
+
+    child = store.load(Child)
+
+    assert child is store.load(Parent)
+
+    store.reset()
+
+    assert store._singleton is None