diff --git a/hash/test/hash_float_test.hpp b/hash/test/hash_float_test.hpp
index 78d12c6..2fda7b8 100644
--- a/hash/test/hash_float_test.hpp
+++ b/hash/test/hash_float_test.hpp
@@ -17,6 +17,7 @@
 #include <boost/limits.hpp>
 
 #include <iostream>
+
 #if defined(BOOST_MSVC)
 #pragma warning(push)
 #pragma warning(disable:4127) // conditional expression is constant
diff --git a/hash/test/hash_global_namespace_test.cpp b/hash/test/hash_global_namespace_test.cpp
index 7ca512a..a64f5eb 100644
--- a/hash/test/hash_global_namespace_test.cpp
+++ b/hash/test/hash_global_namespace_test.cpp
@@ -44,7 +44,7 @@ namespace boost
 #  ifdef TEST_STD_INCLUDES
 #    include <functional>
 #  else
-#    include <boost/functional/hash/hash.hpp>
+#    include <boost/functional/hash.hpp>
 #  endif
 #endif
 
diff --git a/hash/test/hash_map_test.hpp b/hash/test/hash_map_test.hpp
index 31723d5..1a56282 100644
--- a/hash/test/hash_map_test.hpp
+++ b/hash/test/hash_map_test.hpp
@@ -8,6 +8,7 @@
 #else
 
 #include <boost/preprocessor/cat.hpp>
+
 #if defined(BOOST_MSVC)
 #pragma warning(push)
 #pragma warning(disable:4245) // signed/unsigned mismatch
diff --git a/hash/test/hash_set_test.hpp b/hash/test/hash_set_test.hpp
index 7eda536..50791a6 100644
--- a/hash/test/hash_set_test.hpp
+++ b/hash/test/hash_set_test.hpp
@@ -19,7 +19,7 @@ namespace BOOST_PP_CAT(CONTAINER_TYPE, _tests)
     template <class T>
     void integer_tests(T* = 0)
     {
-        const int number_of_containers = 11;
+        const int number_of_containers = 12;
         T containers[number_of_containers];
 
         for(int i = 0; i < 5; ++i) {
@@ -35,6 +35,11 @@ namespace BOOST_PP_CAT(CONTAINER_TYPE, _tests)
         containers[9].insert(-1);
         containers[10].insert(-1);
         containers[10].insert(1);
+        containers[11].insert(1);
+        containers[11].insert(2);
+        containers[11].insert(3);
+        containers[11].insert(4);
+        containers[11].insert(5);
 
         HASH_NAMESPACE::hash<T> hasher;