move tests specifically for the 'LearnerND' to a seperate file

adaptive/tests/test_learnernd.py

+# -*- coding: utf-8 -*-
+
+from ..learner import LearnerND
+from ..runner import replay_log
+
+
+def test_faiure_case_LearnerND():
+    log = [
+        ('ask', 4),
+        ('tell', (-1, -1, -1), 1.607873907219222e-101),
+        ('tell', (-1, -1, 1), 1.607873907219222e-101),
+        ('ask', 2),
+        ('tell', (-1, 1, -1), 1.607873907219222e-101),
+        ('tell', (-1, 1, 1), 1.607873907219222e-101),
+        ('ask', 2),
+        ('tell', (1, -1, 1), 2.0),
+        ('tell', (1, -1, -1), 2.0),
+        ('ask', 2),
+        ('tell', (0.0, 0.0, 0.0), 4.288304431237686e-06),
+        ('tell', (1, 1, -1), 2.0)
+    ]
+    learner = LearnerND(lambda *x: x, bounds=[(-1, 1), (-1, 1), (-1, 1)])
+    replay_log(learner, log)