src/sage/features/singular.py: Fix doctest output

Matthias Koeppe · Matthias Koeppe · commit 9ed65d815186 · 2022-03-01T16:09:39.000-08:00
diff --git a/src/sage/features/singular.py b/src/sage/features/singular.py
@@ -20,7 +20,7 @@ def __init__(self):
 
             sage: from sage.features.singular import Singular
             sage: isinstance(Singular(), Singular)
-            True
+            FeatureTestResult('singular', True)
         """
         Executable.__init__(self, "singular", "Singular",
                             spkg='singular')
