Adding unit test

Author: Neeratyoy

openml/evaluations/functions.py

@@ -202,7 +202,7 @@ def __list_evaluations(api_call, output_format='object'):
     return evals
 
 
-def list_evaluation_measures() -> list:
+def list_evaluation_measures() -> List[str]:
     """ Return list of evaluation measures available.
 
     The function performs an API call to retrieve the entire list of

tests/test_evaluations/test_evaluation_functions.py

@@ -116,3 +116,8 @@ def test_evaluation_list_per_fold(self):
         for run_id in evaluations.keys():
             self.assertIsNotNone(evaluations[run_id].value)
             self.assertIsNone(evaluations[run_id].values)
+
+    def test_list_evaluation_measures(self):
+        measures = openml.evaluations.list_evaluation_measures()
+        self.assertEqual([isinstance(measures), list)
+        self.assertEqual(all([isinstance(s, str) for s in measures]), True)