11187: Fixed heisenbug caused by temporarily breaking the implementat…

…ion of (co)degrees for testing without restoring it after

src/sage/categories/finite_complex_reflection_groups.py

@@ -195,10 +195,11 @@ def _test_degrees(self, **options):
                 Reducible real reflection group of rank 4 and type A2 x B2
                 sage: W._test_degrees()
 
-                sage: SymmetricGroup(3)._test_degrees()
+                sage: W = SymmetricGroup(5)
+                sage: W._test_degrees()
 
+            We now break the implementation of W.degrees and check that this is caught::
 
-                sage: W = SymmetricGroup(5)
                 sage: W.degrees = lambda: (1/1,5)
                 sage: W._test_degrees()
                 Traceback (most recent call last):
@@ -211,6 +212,11 @@ def _test_degrees(self, **options):
                 ...
                 AssertionError: the degrees should be larger than 2
 
+            We restore W to its normal state::
+
+                sage: del W.degrees
+                sage: W._test_degrees()
+
             See the documentation for :class:`TestSuite` for more information.
             """
             from sage.structure.element import parent
@@ -244,9 +250,11 @@ def _test_codegrees(self, **options):
                 Reducible real reflection group of rank 4 and type A2 x B2
                 sage: W._test_codegrees()
 
-                sage: SymmetricGroup(3)._test_codegrees()
-
                 sage: W = SymmetricGroup(5)
+                sage: W._test_codegrees()
+
+            We now break the implementation of W.degrees and check that this is caught::
+
                 sage: W.codegrees = lambda: (1/1,5)
                 sage: W._test_codegrees()
                 Traceback (most recent call last):
@@ -259,6 +267,11 @@ def _test_codegrees(self, **options):
                 ...
                 AssertionError: the codegrees should be nonnegative
 
+            We restore W to its normal state::
+
+                sage: del W.codegrees
+                sage: W._test_codegrees()
+
             See the documentation for :class:`TestSuite` for more information.
             """
             from sage.structure.element import parent