diff --git a/test/unit/core/conversions_test.cpp b/test/unit/core/conversions_test.cpp
index 43592af01..abd3d7f8e 100644
--- a/test/unit/core/conversions_test.cpp
+++ b/test/unit/core/conversions_test.cpp
@@ -284,16 +284,19 @@ SECTION("to string") {
         REQUIRE( string2bool("true",val) );
         REQUIRE( val == true );
 
-        // mapnik::value hashability
+        // mapnik::value hash() and operator== works for all T in value<Types...>
+        mapnik::transcoder tr("utf8");
         using values_container = std::unordered_map<mapnik::value, unsigned>;
         values_container vc;
-        mapnik::value val2(1);
-        vc[val2] = 1;
-        REQUIRE( vc[1] == static_cast<int>(1) );
+        mapnik::value keys[5] = {true, 1, 3.14159f, tr.transcode("Мапник"), mapnik::value_null()} ;
+        for (auto const& k : keys)
+        {
+            vc.insert({k, 123456789});
+            REQUIRE( vc[k] == 123456789 );
+        }
 
         // mapnik::value << to ostream
         std::stringstream s;
-        mapnik::transcoder tr("utf-8");
         mapnik::value_unicode_string ustr = tr.transcode("hello world!");
         mapnik::value streamable(ustr);
         s << streamable;