[ruby] add a few tests for std::wstring

Examples/test-suite/ruby/Makefile.in

@@ -19,6 +19,7 @@ CPP_TEST_CASES = \
 	li_std_queue \
 	li_std_set \
 	li_std_stack \
+	li_std_wstring \
 	primitive_types \
 	ruby_keywords \
 	ruby_minherit_shared_ptr \

Examples/test-suite/ruby/li_std_wstring_runme.rb

@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+require 'swig_assert'
+require 'li_std_wstring'
+
+x = "h"
+
+swig_assert_equal("Li_std_wstring.test_value(x)", "x", binding)
+
+
+x = "abc"
+
+swig_assert_equal("Li_std_wstring.test_value(x)", "x", binding)
+
+x = "hello"
+
+swig_assert_equal("Li_std_wstring.test_const_reference(x)", "x", binding)
+
+a = Li_std_wstring::A.new(x)
+
+swig_assert_equal("Li_std_wstring.test_value(a)", "x", binding)
+
+swig_assert_equal("Li_std_wstring.test_value(x)", "x", binding)

Lib/ruby/std_basic_string.i

@@ -55,6 +55,10 @@ SWIGINTERNINLINE VALUE
 
 #if !defined(SWIG_STD_WSTRING)
 
+%traits_swigtype(std::basic_string<wchar_t>);
+%fragment(SWIG_Traits_frag(std::basic_string<wchar_t>));
+
+
 %fragment(SWIG_AsPtr_frag(std::basic_string<wchar_t>),"header",
 	  fragment="SWIG_AsWCharPtrAndSize") {
 SWIGINTERN int