tests/basics/builtin_pow3: Add tests for edge cases of pow3.

tests/basics/builtin_pow3.py

@@ -7,6 +7,12 @@ except NotImplementedError:
     print("SKIP")
     raise SystemExit
 
+# test some edge cases
+print(pow(1, 1, 1))
+print(pow(0, 1, 1))
+print(pow(1, 0, 1))
+print(pow(1, 0, 2))
+
 # 3 arg pow is defined to only work on integers
 try:
     print(pow("x", 5, 6))