Resolve "(BalancingLearner) loss is cached incorrectly"

Closes #108 (closed)

adaptive/tests/test_learnernd.py

@@ -4,7 +4,7 @@ from ..learner import LearnerND
 from ..runner import replay_log
 
 
-def test_failure_case_LearnerND():
+def test_faiure_case_LearnerND():
     log = [
         ('ask', 4),
         ('tell', (-1, -1, -1), 1.607873907219222e-101),