TST test that all default arguments are not mutable

amueller · amueller · commit 22fd445b5091 · 2015-03-10T14:08:17.000-04:00
diff --git a/sklearn/utils/estimator_checks.py b/sklearn/utils/estimator_checks.py
@@ -17,6 +17,7 @@
 from sklearn.utils.testing import assert_raise_message
 from sklearn.utils.testing import assert_equal
 from sklearn.utils.testing import assert_true
+from sklearn.utils.testing import assert_in
 from sklearn.utils.testing import assert_array_equal
 from sklearn.utils.testing import assert_array_almost_equal
 from sklearn.utils.testing import META_ESTIMATORS
@@ -1059,6 +1060,7 @@ def check_parameters_default_constructible(name, Estimator):
         else:
             return
         for arg, default in zip(args, defaults):
+            assert_in(type(default), [str, int, float, bool, tuple, type(None)])
             if arg not in params.keys():
                 # deprecated parameter, not in get_params
                 assert_true(default is None)
