refactor: extract character effect helpers

backend/tests/unit/test_effect_apply.py

@@ -0,0 +1,35 @@
+from core.basic.character.effect_apply import execute_effect, uppercase_attrs
+
+
+class Source:
+    STR = 10
+
+    def __init__(self):
+        self.INT = 20
+        self.name = 'ignored'
+
+
+class Effects:
+    def execture(self, key):
+        if key != 'known':
+            return None
+
+        def effect(target):
+            target.append(key)
+
+        return effect
+
+
+def test_uppercase_attrs_returns_only_uppercase_instance_keys():
+    assert uppercase_attrs(Source()) == {'INT': 20}
+
+
+def test_execute_effect_returns_false_for_missing_effect():
+    assert execute_effect(Effects(), 'missing', []) is False
+
+
+def test_execute_effect_calls_existing_effect():
+    target = []
+
+    assert execute_effect(Effects(), 'known', target) is True
+    assert target == ['known']