diff --git a/include/ut/openbmc_dbus_rest_test.cpp b/include/ut/openbmc_dbus_rest_test.cpp
index e671e47..554ab74 100644
--- a/include/ut/openbmc_dbus_rest_test.cpp
+++ b/include/ut/openbmc_dbus_rest_test.cpp
@@ -1,5 +1,6 @@
 #include "include/openbmc_dbus_rest.hpp"
 
+#include "gmock/gmock.h"
 #include "gtest/gtest.h"
 
 // Also see redfish-core/ut/configfile_test.cpp
@@ -33,3 +34,52 @@
         crow::openbmc_mapper::validateFilename("../../../../../../etc/shadow"));
     EXPECT_FALSE(crow::openbmc_mapper::validateFilename("."));
 }
+
+TEST(OpenBmcDbusTest, TestArgSplit)
+{
+    // test the basic types
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("x"),
+                ::testing::ElementsAre("x"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("y"),
+                ::testing::ElementsAre("y"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("b"),
+                ::testing::ElementsAre("b"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("n"),
+                ::testing::ElementsAre("n"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("q"),
+                ::testing::ElementsAre("q"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("i"),
+                ::testing::ElementsAre("i"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("u"),
+                ::testing::ElementsAre("u"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("x"),
+                ::testing::ElementsAre("x"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("t"),
+                ::testing::ElementsAre("t"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("d"),
+                ::testing::ElementsAre("d"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("h"),
+                ::testing::ElementsAre("h"));
+    // test arrays
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("ai"),
+                ::testing::ElementsAre("ai"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("ax"),
+                ::testing::ElementsAre("ax"));
+    // test tuples
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("(sss)"),
+                ::testing::ElementsAre("(sss)"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("(sss)b"),
+                ::testing::ElementsAre("(sss)", "b"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("b(sss)"),
+                ::testing::ElementsAre("b", "(sss)"));
+
+    // Test nested types
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("a{si}b"),
+                ::testing::ElementsAre("a{si}", "b"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("a(sss)b"),
+                ::testing::ElementsAre("a(sss)", "b"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("aa{si}b"),
+                ::testing::ElementsAre("aa{si}", "b"));
+    EXPECT_THAT(crow::openbmc_mapper::dbusArgSplit("i{si}b"),
+                ::testing::ElementsAre("i", "{si}", "b"));
+}