diff --git a/struct_utils/map_params_test.go b/struct_utils/map_params_test.go
index 369264e48eb00adaf249236e35c5b22eb0e0b469..a0d539e562cd65f831473c0231cdec542a7729a5 100644
--- a/struct_utils/map_params_test.go
+++ b/struct_utils/map_params_test.go
@@ -59,3 +59,24 @@ func TestAnonymous(t *testing.T) {
 	}
 	t.Logf("ps=%+v -> pm=%+v", ps, pm)
 }
+
+func TestMapParams(t *testing.T) {
+	type paramsStruct struct {
+		ID  int64   `json:"id,omitempty"`
+		IDs []int64 `json:"ids,omitempty"`
+	}
+
+	ps := paramsStruct{ID: 123}
+	pm := struct_utils.MapParams(ps)
+	if len(pm) != 1 || pm["id"] != "123" {
+		t.Fatalf("wrong params: %+v != %+v", ps, pm)
+	}
+	t.Logf("ps=%+v -> pm=%+v", ps, pm)
+
+	ps = paramsStruct{IDs: []int64{1, 2, 3}}
+	pm = struct_utils.MapParams(ps)
+	if len(pm) != 1 || pm["ids"] != "[1,2,3]" {
+		t.Fatalf("wrong params: %+v != %+v", ps, pm)
+	}
+	t.Logf("ps=%+v -> pm=%+v", ps, pm)
+}