+ test special components for complex_abs()

Author: skirpichev

Lib/test/test_complex.py

@@ -11,6 +11,7 @@
 
 from random import random
 from math import isnan, copysign
+import cmath
 import operator
 
 INF = float("inf")
@@ -791,6 +792,19 @@ def test_abs(self):
         for num in nums:
             self.assertAlmostEqual((num.real**2 + num.imag**2)  ** 0.5, abs(num))
 
+        for x in 0.0, -0.0, INF, -INF, NAN:
+            for y in 0.0, -0.0, INF, -INF, NAN:
+                with self.subTest(x=x, y=y):
+                    z = complex(x, y)
+                    r = abs(z)
+                    if cmath.isfinite(z):
+                        self.assertFloatsAreIdentical(r, 0.0)
+                    elif cmath.isinf(z):
+                        self.assertEqual(r, INF)
+                    else:
+                        self.assertTrue(cmath.isnan(z))
+                        self.assertTrue(isnan(r))
+
         self.assertRaises(OverflowError, abs, complex(DBL_MAX, DBL_MAX))
 
     def test_abs_errno_handling(self):