diff --git a/help_function/help_function.xml b/help_function/help_function.xml
index a7fec1470..a1293df65 100644
--- a/help_function/help_function.xml
+++ b/help_function/help_function.xml
@@ -113,6 +113,7 @@
     <test testName="onedpl_test_sort_by_key" configFile="config/TEMPLATE_help_function.xml" />
     <test testName="onedpl_test_sort_keys" configFile="config/TEMPLATE_help_function_skip_double.xml" />
     <test testName="onedpl_test_sort_pairs" configFile="config/TEMPLATE_help_function_skip_double.xml" />
+    <test testName="onedpl_test_null_type" configFile="config/TEMPLATE_help_function.xml" />
     <test testName="onedpl_test_stable_partition_copy" configFile="config/TEMPLATE_help_function.xml" />
     <test testName="onedpl_test_stable_partition" configFile="config/TEMPLATE_help_function.xml" />
     <test testName="onedpl_test_tabulate" configFile="config/TEMPLATE_help_function.xml" />
diff --git a/help_function/src/onedpl_test_null_type.cpp b/help_function/src/onedpl_test_null_type.cpp
new file mode 100644
index 000000000..2957b6733
--- /dev/null
+++ b/help_function/src/onedpl_test_null_type.cpp
@@ -0,0 +1,102 @@
+// ====------ onedpl_test_null_type.cpp---------- -*- C++ -* ----===////
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//
+// ===----------------------------------------------------------------------===//
+
+#include "oneapi/dpl/execution"
+
+#include "dpct/dpct.hpp"
+#include "dpct/dpl_utils.hpp"
+
+#include <sycl/sycl.hpp>
+
+#include <iostream>
+
+template <typename String, typename _T1, typename _T2>
+int ASSERT_EQUAL(String msg, _T1 &&X, _T2 &&Y) {
+    if (X != Y) {
+        std::cout << "FAIL: " << msg << " - (" << X << "," << Y << ")" << std::endl;
+        return 1;
+    } else {
+        std::cout << "PASS: " << msg << std::endl;
+        return 0;
+    }
+}
+
+template <typename KeyT> int reorder_key(KeyT &a, KeyT &b) {
+    if (b < a) {
+        ::std::swap(a, b);
+    }
+    // returns 1 if reorder key is used
+    return 1;
+}
+
+// shows example usage of dpct::null_type, this has actual ValueT arguments
+template <typename KeyT, typename ValueT>
+typename ::std::enable_if<!::std::is_same<ValueT, dpct::null_type>::value,
+                          int>::type
+reorder_pair(KeyT &a_key, KeyT &b_key, ValueT &a_val, ValueT &b_val) {
+    if (b_key < a_key) {
+        ::std::swap(a_key, b_key);
+        ::std::swap(a_val, b_val);
+    }
+    // returns 2 if reorder_pair is used
+    return 2;
+}
+
+// shows example usage of dpct::null_typeas an indicator to convert to key only
+template <typename KeyT, typename ValueT>
+typename ::std::enable_if<::std::is_same<ValueT, dpct::null_type>::value,
+                          int>::type
+reorder_pair(KeyT &a_key, KeyT &b_key, ValueT, ValueT) {
+    return reorder_key(a_key, b_key);
+}
+
+int main() {
+    // used to detect failures
+    int failed_tests = 0;
+    int num_failing = 0;
+    std::string test_name = "";
+
+    {
+        // test normal usage
+        int a = 5;
+        int b = 3;
+        int64_t a_val = -5;
+        int64_t b_val = -3;
+        int ret = reorder_pair(a, b, a_val, b_val);
+        bool result = (ret == 2) && a == 3 && b == 5 && a_val == -3 && b_val == -5;
+        test_name = "Testing normal usage of helpers 1/2";
+        failed_tests += ASSERT_EQUAL(test_name, result, true);
+
+        a = 5;
+        b = 3;
+        a_val = -5;
+        b_val = -3;
+        ret = reorder_key(a, b);
+        result = (ret == 1) && a == 3 && b == 5 && a_val == -5 && b_val == -3;
+        test_name = "Testing normal usage of helpers 2/2";
+        failed_tests += ASSERT_EQUAL(test_name, result, true);
+
+        // test null_type redirect
+        a = 5;
+        b = 3;
+        a_val = -5;
+        b_val = -3;
+        ret = reorder_pair(a, b, dpct::null_type{}, dpct::null_type{});
+        result = (ret == 1) && a == 3 && b == 5 && a_val == -5 && b_val == -3;
+        test_name = "Testing null_type redirect";
+        failed_tests += ASSERT_EQUAL(test_name, result, true);
+    }
+
+    std::cout << std::endl
+                << failed_tests << " failing test(s) detected." << std::endl;
+    if (failed_tests == 0) {
+        return 0;
+    }
+    return 1;
+}