diff --git a/tests/10_cmath.py b/tests/10_cmath.py
index fd42034d..a850f0e3 100644
--- a/tests/10_cmath.py
+++ b/tests/10_cmath.py
@@ -1,6 +1,17 @@
 from cmath import isclose, sqrt, nan, inf, nanj, infj, log
 import math
 
+c1 = complex(3, 4)
+c2 = complex(2, 4.5)
+
+assert c1 + 5 == complex(8,4)
+assert c1 + c2 == complex(5, 8.5)
+assert c1 - c2 == complex(1, -0.5)
+assert c1*4 == complex(12, 16)
+assert c1*c2 == complex(-12, 21.5)
+assert c2/c1 == complex(0.96, 0.22)
+assert isclose(c2**2, complex(-16.25, 17.99999999999999))
+
 assert 1+2j == complex(1, 2) == 2j+1
 
 assert isclose(1+2j + 3+4j, 4+6j)