1 files changed, 24 insertions, 0 deletions
diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index cfea281..37e4511 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -232,6 +232,30 @@ class TestPredicates(IsTestBase):
         self.assertFalse(inspect.isabstract(int))
         self.assertFalse(inspect.isabstract(5))
 
+    def test_isabstract_during_init_subclass(self):
+        from abc import ABCMeta, abstractmethod
+        isabstract_checks = []
+        class AbstractChecker(metaclass=ABCMeta):
+            def __init_subclass__(cls):
+                isabstract_checks.append(inspect.isabstract(cls))
+        class AbstractClassExample(AbstractChecker):
+            @abstractmethod
+            def foo(self):
+                pass
+        class ClassExample(AbstractClassExample):
+            def foo(self):
+                pass
+        self.assertEqual(isabstract_checks, [True, False])
+
+        isabstract_checks.clear()
+        class AbstractChild(AbstractClassExample):
+            pass
+        class AbstractGrandchild(AbstractChild):
+            pass
+        class ConcreteGrandchild(ClassExample):
+            pass
+        self.assertEqual(isabstract_checks, [True, True, False])
+
 
 class TestInterpreterStack(IsTestBase):
     def __init__(self, *args, **kwargs):