diff --git a/Lib/test/test_cmath.py b/Lib/test/test_cmath.py
index a986fd6b892bd2..46a9e0c1feb470 100644
--- a/Lib/test/test_cmath.py
+++ b/Lib/test/test_cmath.py
@@ -584,6 +584,9 @@ def test_complex_near_zero(self):
         self.assertIsNotClose(0.001-0.001j, 0.001+0.001j, abs_tol=1e-03)
 
     def test_complex_special(self):
+        self.assertIsClose(complex(INF,INF),complex(INF,INF))
+        self.assertIsClose(complex(-INF,-INF),complex(-INF,-INF))
+        self.assertIsNotClose(complex(NAN,NAN),complex(NAN,NAN))
         self.assertIsNotClose(INF, INF*1j)
         self.assertIsNotClose(INF*1j, INF)
         self.assertIsNotClose(INF, -INF)