#2705 - Move application registry into application module instead of hardcoding in game module

tests/unit_tests/_primaite/_simulator/_system/_applications/test_application_registry.py

@@ -0,0 +1,22 @@
+# © Crown-owned copyright 2024, Defence Science and Technology Laboratory UK
+import pytest
+
+from primaite.simulator.system.applications.application import Application
+
+
+def test_adding_to_app_registry():
+    class temp_application(Application, identifier="temp_app"):
+        pass
+
+    assert Application._application_registry["temp_app"] is temp_application
+
+    with pytest.raises(ValueError):
+
+        class another_application(Application, identifier="temp_app"):
+            pass
+
+    # This is kinda evil...
+    # Because pytest doesn't reimport classes from modules, registering this temporary test application will change the
+    # state of the Application registry for all subsequently run tests. So, we have to delete and unregister the class.
+    del temp_application
+    Application._application_registry.pop("temp_app")