bpo-33569 Preserve type information with dataclasses.InitVar (GH-8927)

1 files changed, 6 insertions, 0 deletions

diff --git a/Lib/test/test_dataclasses.py b/Lib/test/test_dataclasses.py
index 8672106..53e8443 100755
--- a/Lib/test/test_dataclasses.py
+++ b/Lib/test/test_dataclasses.py
@@ -1097,6 +1097,12 @@ class TestCase(unittest.TestCase):
         c = C(init_param=10)
         self.assertEqual(c.x, 20)
 
+    def test_init_var_preserve_type(self):
+        self.assertEqual(InitVar[int].type, int)
+
+        # Make sure the repr is correct.
+        self.assertEqual(repr(InitVar[int]), 'dataclasses.InitVar[int]')
+
     def test_init_var_inheritance(self):
         # Note that this deliberately tests that a dataclass need not
         #  have a __post_init__ function if it has an InitVar field.