Add test for overloading and NULL

Examples/test-suite/python/overload_null_runme.py

@@ -0,0 +1,44 @@
+from overload_null import *
+
+def check(a, b):
+    if a != b:
+        raise RuntimeError(str(a) + " does not equal " + str(b))
+
+o = Overload()
+x = X()
+
+check(1, o.byval1(x))
+check(2, o.byval1(None))
+
+check(3, o.byval2(None))
+check(4, o.byval2(x))
+
+check(5, o.byref1(x))
+check(6, o.byref1(None))
+
+check(7, o.byref2(None))
+check(8, o.byref2(x))
+
+check(9, o.byconstref1(x))
+check(10, o.byconstref1(None))
+
+check(11, o.byconstref2(None))
+check(12, o.byconstref2(x))
+
+# const pointer references
+check(13, o.byval1cpr(x))
+check(14, o.byval1cpr(None))
+
+check(15, o.byval2cpr(None))
+check(16, o.byval2cpr(x))
+
+# forward class declaration
+check(17, o.byval1forwardptr(x))
+check(18, o.byval1forwardptr(None))
+
+check(19, o.byval2forwardptr(None))
+check(20, o.byval2forwardptr(x))
+
+check(21, o.byval1forwardref(x))
+
+check(22, o.byval2forwardref(x))