Unit tests added for internal/config

internal/config/section.go

@@ -142,6 +142,8 @@ func mapOfValue(section reflect.Value) map[string]any {
 		fv := section.FieldByIndex(f.index)
 		if f.section {
 			m[f.key] = mapOfValue(fv)
+		} else if f.typ == durationType {
+			m[f.key] = fv.Interface().(time.Duration).String()
 		} else {
 			m[f.key] = fv.Interface()
 		}