diff --git a/test/format_test3.cpp b/test/format_test3.cpp
index 231a91b..1633627 100644
--- a/test/format_test3.cpp
+++ b/test/format_test3.cpp
@@ -123,10 +123,12 @@ int test_main(int, char* [])
     // http://lists.boost.org/boost-users/2005/11/15454.php
     std::string l_param;
     std::string l_str = (boost::format("here is an empty string: %1%") % l_param).str(); 
+    BOOST_CHECK_EQUAL(std::string("here is an empty string: "), l_str);
 
     // testcase for SourceForge bug #1506914
     std::string arg; // empty string  
     s = str(format("%=8s") % arg);
+    BOOST_CHECK_EQUAL(std::string("        "), s);
 
     return 0;
 }
diff --git a/test/format_test_wstring.cpp b/test/format_test_wstring.cpp
index c30f740..4f9a871 100644
--- a/test/format_test_wstring.cpp
+++ b/test/format_test_wstring.cpp
@@ -29,8 +29,16 @@ int test_main(int, char* [])
       BOOST_ERROR("Basic w-parsing Failed");
   if(str( wformat(L"%%##%#x ##%%1 %s00") % 20 % L"Escaped OK" ) != L"%##0x14 ##%1 Escaped OK00")
       BOOST_ERROR("Basic wp-parsing Failed") ;
-#endif // wformat tests
 
+  // testcase for https://svn.boost.org/trac10/ticket/7379 (for valgrind)
+  wformat wfmt(L"%1$.1f");
+  std::wstring ws = str(wfmt % 123.45f);
+  BOOST_CHECK_EQUAL(ws.compare(L"123.4"), 0);
+  wformat wfmt2(L"%1$.0f %%");
+  std::wstring ws2 = (wfmt2 % 123.45f).str();
+  BOOST_CHECK_EQUAL(ws2.compare(L"123 %"), 0);
+
+#endif // wformat tests
 
   return 0;
 }