Add tests for the hash forward header.

[SVN r32587]

test/hash_fwd_test_2.cpp

@@ -0,0 +1,32 @@
+//  (C) Copyright Daniel James 2005.
+//  Use, modification and distribution are subject to the
+//  Boost Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// This test just makes sure a header which uses hash_fwd can compile without
+// the main hash headers.
+
+#include "./hash_fwd_test.hpp"
+
+#define BOOST_TEST_MAIN
+#include <boost/test/unit_test.hpp>
+
+template <class T> void unused(T const&) {}
+
+BOOST_AUTO_TEST_CASE(fwd_test)
+{
+    test_type1<int> x1(3);
+    test_type1<std::string> y1("Black");
+    test_type2<int> x2(25, 16);
+    test_type2<std::string> y2("White", "Green");
+
+    std::vector<int> empty;
+    std::vector<std::string> empty2;
+
+    test_type3<int> x3(empty.begin(), empty.end());
+    test_type3<std::string> y3(empty2.begin(), empty2.end());
+
+    // Prevent gcc warnings:
+    unused(x1); unused(x2); unused(x3);
+    unused(y1); unused(y2); unused(y3);
+}