Add failing test for pure Python datetime subclasses

pganssle · pganssle · commit 511e2f122815 · 2017-10-30T11:54:05.000-04:00
diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py
@@ -1520,6 +1520,13 @@ def test_replace(self):
         base = cls(2000, 2, 29)
         self.assertRaises(ValueError, base.replace, year=2001)
 
+    def test_subclass_replace(self):
+        class C(self.theclass):
+            pass
+
+        dt = C(2012, 1, 1)
+        self.assertIs(type(dt.replace(year=2013)), C)
+
     def test_subclass_date(self):
 
         class C(self.theclass):
@@ -2626,6 +2633,13 @@ def test_replace(self):
         self.assertRaises(ValueError, base.replace, second=100)
         self.assertRaises(ValueError, base.replace, microsecond=1000000)
 
+    def test_subclass_replace(self):
+        class C(self.theclass):
+            pass
+
+        ctime = C(12, 30)
+        self.assertIs(type(ctime.replace(hour=10)), C)
+
     def test_subclass_time(self):
 
         class C(self.theclass):
