add type annotations for adaptive/tests/test_average_learner.py

Author: basnijholt

adaptive/tests/test_average_learner.py

@@ -5,7 +5,7 @@
 from adaptive.learner import AverageLearner
 
 
-def test_only_returns_new_points():
+def test_only_returns_new_points() -> None:
     learner = AverageLearner(lambda x: x, atol=None, rtol=0.01)
 
     # Only tell it n = 5...10
@@ -21,7 +21,7 @@ def test_only_returns_new_points():
     assert learner.ask(1)[0][0] == 10
 
 
-def test_avg_std_and_npoints():
+def test_avg_std_and_npoints() -> None:
     learner = AverageLearner(lambda x: x, atol=None, rtol=0.01)
 
     for i in range(300):