changed task_class fixture

tests/test_tasks.py

@@ -4,10 +4,9 @@ from typing import List
 import lm_eval.tasks as tasks
 from lm_eval.api.task import ConfigurableTask
 
-
+# Using fixtures to get the task class and limit
 @pytest.fixture()
-def task_class(task_name: List[str] = None) -> ConfigurableTask:
-    if task_name is None:
+def task_class(task_name: List[str]) -> ConfigurableTask:
     task_name = ["arc_easy"]
     x = [cls for name, cls in tasks.TASK_REGISTRY.items() if name in task_name]
     return x[0]