diff --git a/test/src/unit-ordered_json.cpp b/test/src/unit-ordered_json.cpp
index 9b242c825..92a5b9882 100644
--- a/test/src/unit-ordered_json.cpp
+++ b/test/src/unit-ordered_json.cpp
@@ -76,4 +76,18 @@ TEST_CASE("ordered_json")
     CHECK(multi_ordered.dump() == "{\"z\":1,\"m\":2,\"y\":4}");
     CHECK(multi_ordered.erase("m") == 1);
     CHECK(multi_ordered.dump() == "{\"z\":1,\"y\":4}");
+    
+    // Ranged insert test.
+    // It seems that values shouldn't be overwritten. Only new values are added
+    json j1 {{"c", 1}, {"b", 2}, {"a", 3}};
+    const json j2 {{"c", 77}, {"d", 42}, {"a", 4}};
+    j1.insert( j2.cbegin(), j2.cend() );
+    CHECK(j1.size() == 4);
+    CHECK(j1.dump() == "{\"a\":3,\"b\":2,\"c\":1,\"d\":42}");
+    
+    ordered_json oj1 {{"c", 1}, {"b", 2}, {"a", 3}};
+    const ordered_json oj2 {{"c", 77}, {"d", 42}, {"a", 4}};
+    oj1.insert( oj2.cbegin(), oj2.cend() );
+    CHECK(oj1.size() == 4);
+    CHECK(oj1.dump() == "{\"c\":1,\"b\":2,\"a\":3,\"d\":42}");
 }