Overloading for non-pointers and NULL - Javascript

Overloading support for Javascript is generally incomplete as there are
no typecheck typemaps, so the overloading and NULL support added here
doesn't work and won't work until the typecheck typemaps are
implemented.

Examples/test-suite/javascript/overload_null_runme.js

@@ -0,0 +1,49 @@
+// There are no typecheck typemaps in Javascript yet, so most of this test
+// does not actually worked - the check functions have thus been commented out.
+var overload_null = require("overload_null");
+
+var check = function(expected, actual) {
+  if (expected !== actual) {
+    throw new Error(a + " does not equal " + b);
+  }
+};
+
+
+var o = new overload_null.Overload();
+var x = new overload_null.X();
+
+check(1, o.byval1(x));
+// check(2, o.byval1(null));
+
+// check(3, o.byval2(null));
+check(4, o.byval2(x));
+
+check(5, o.byref1(x));
+// check(6, o.byref1(null));
+
+// check(7, o.byref2(null));
+check(8, o.byref2(x));
+
+check(9, o.byconstref1(x));
+// check(10, o.byconstref1(null));
+
+// check(11, o.byconstref2(null));
+check(12, o.byconstref2(x));
+
+// const pointer references
+check(13, o.byval1cpr(x));
+// check(14, o.byval1cpr(null));
+
+// check(15, o.byval2cpr(null));
+check(16, o.byval2cpr(x));
+
+// forward class declaration
+check(17, o.byval1forwardptr(x));
+// check(18, o.byval1forwardptr(null));
+
+// check(19, o.byval2forwardptr(null));
+check(20, o.byval2forwardptr(x));
+
+check(21, o.byval1forwardref(x));
+
+check(22, o.byval2forwardref(x));