add tests to improve coverage for test_complex_special

Author: Aniketsy

Lib/test/test_cmath.py

@@ -590,6 +590,25 @@ def test_complex_special(self):
         self.assertIsNotClose(-INF, INF)
         self.assertIsNotClose(0, INF)
         self.assertIsNotClose(0, INF*1j)
+        self.assertIsNotClose(complex(INF, INF), complex(-INF, -INF))
+        self.assertIsNotClose(complex(INF, INF), complex(INF, -INF))
+        self.assertIsNotClose(complex(INF, INF), complex(-INF, INF))
+        self.assertIsNotClose(complex(-INF, INF), complex(INF, -INF))
+        self.assertIsNotClose(complex(NAN, NAN), complex(NAN, NAN))
+        self.assertIsNotClose(complex(NAN, 0), complex(NAN, 0))
+        self.assertIsNotClose(complex(0, NAN), complex(0, NAN))
+        self.assertIsNotClose(complex(INF, NAN), complex(INF, NAN))
+        self.assertIsNotClose(complex(NAN, INF), complex(NAN, INF))
+        self.assertIsNotClose(complex(-INF, NAN), complex(-INF, NAN))
+        self.assertIsNotClose(complex(NAN, -INF), complex(NAN, -INF))
+        self.assertIsNotClose(complex(INF, INF), complex(1, 1))
+        self.assertIsNotClose(complex(-INF, -INF), complex(1, 1))
+        self.assertIsNotClose(complex(INF, 0), complex(0, 0))
+        self.assertIsNotClose(complex(0, INF), complex(0, 0))
+        self.assertIsClose(complex(INF, INF), complex(INF, INF))
+        self.assertIsClose(complex(-INF, -INF), complex(-INF, -INF))
+        self.assertIsClose(complex(INF, -INF), complex(INF, -INF))
+        self.assertIsClose(complex(-INF, INF), complex(-INF, INF))
 
 
 if __name__ == "__main__":