Fix some stuff

Author: MattyTheHacker

tests/test_exceptions.py

@@ -665,6 +665,18 @@ def DEPENDENT_COMMANDS(cls) -> frozenset[str]:
             """
             return frozenset(("test_command_1",))
 
+        @classproperty
+        @override
+        def DEPENDENT_TASKS(cls) -> frozenset[str]:
+            """The set of names of bot tasks that require this Discord entity."""
+            return frozenset(("test_task_1",))
+
+        @classproperty
+        @override
+        def DEPENDENT_EVENTS(cls) -> frozenset[str]:
+            """The set of names of bot events that require this Discord entity."""
+            return frozenset(("test_event_1",))
+
         @classproperty
         @override
         def ROLE_NAME(cls) -> str:
@@ -688,6 +700,38 @@ def test_role_name_in_str(self) -> None:
             self._RoleDoesNotExistErrorSubclass()
         )
 
+    def test_error_code(self) -> None:
+        """Test that the error code is set correctly."""
+        assert self._RoleDoesNotExistErrorSubclass.ERROR_CODE == "E1"
+
+    def test_default_message(self) -> None:
+        """Test that the default message is correct."""
+        assert (
+            self._RoleDoesNotExistErrorSubclass.DEFAULT_MESSAGE == (
+                'Role with name "role_name_1" does not exist.'
+            )
+        )
+
+    def test_init_with_custom_message(self) -> None:
+        """Test that a custom message is used if provided."""
+        msg = "Custom error message"
+        exc = self._RoleDoesNotExistErrorSubclass(msg)
+        assert str(exc) == msg
+
+    def test_default_dependant_message(self) -> None:
+        """Test that the default message is correct."""
+        test_exception: RoleDoesNotExistError = self._RoleDoesNotExistErrorSubclass()
+        assert (
+            test_exception.get_formatted_message(
+                non_existent_object_identifier=test_exception.ROLE_NAME,
+            )
+            == (
+                f'"{test_exception.ROLE_NAME}" {test_exception.DOES_NOT_EXIST_TYPE} must exist'
+                " in order to use the \"/test_command_1\" command, the \"test_task_1\" task"
+                " and the \"test_event_1\" event."
+            )
+        )
+
 
 class TestCommitteeRoleDoesNotExistError:
     """