finshed a first round of test, starting examples

test/set/post_pre.cpp

@@ -0,0 +1,35 @@
+
+// Test post before pre (for free func, but same for all contracts).
+
+#include "../aux_/oteststream.hpp"
+#include <boost/contract/free_function.hpp>
+#include <boost/contract/scoped.hpp>
+#include <boost/detail/lightweight_test.hpp>
+#include <sstream>
+
+boost::contract::aux::test::oteststream out;
+
+void f() {
+    boost::contract::scoped c = boost::contract::free_function()
+        .postcondition([] { out << "f::post" << std::endl; })
+        .precondition([] { out << "f::pre" << std::endl; })
+    ;
+    out << "f::body" << std::endl;
+}
+
+int main() {
+    std::ostringstream ok;
+
+    out.str("");
+    f();
+    ok.str("");
+    ok
+        << "f::pre" << std::endl
+        << "f::body" << std::endl
+        << "f::post" << std::endl
+    ;
+    BOOST_TEST(out.eq(ok.str()));
+
+    return boost::report_errors();
+}
+