diff --git a/test/test_utils.cpp b/test/test_utils.cpp
new file mode 100644
index 0000000..08eecf7
--- /dev/null
+++ b/test/test_utils.cpp
@@ -0,0 +1,62 @@
+#include "utils.hpp"
+
+#include <sdbusplus/test/sdbus_mock.hpp>
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+using ::testing::_;
+using ::testing::Invoke;
+using ::testing::IsNull;
+using ::testing::Return;
+using ::testing::StrEq;
+
+TEST(Utils, GetPSUInventoryPath)
+{
+    sdbusplus::SdBusMock sdbusMock;
+    auto bus = sdbusplus::get_mocked_new(&sdbusMock);
+
+    EXPECT_CALL(sdbusMock, sd_bus_message_new_method_call(
+                               _, _, _, _, _, StrEq("GetSubTreePaths")));
+
+    EXPECT_CALL(sdbusMock, sd_bus_message_ref(IsNull()))
+        .WillOnce(Return(nullptr));
+    sdbusplus::message::message msg(nullptr, &sdbusMock);
+
+    const char* path0 = "/com/example/chassis/powersupply0";
+    const char* path1 = "/com/example/chassis/powersupply1";
+
+    // std::vector
+    EXPECT_CALL(sdbusMock,
+                sd_bus_message_enter_container(IsNull(), 'a', StrEq("s")))
+        .WillOnce(Return(1));
+
+    // while !at_end()
+    EXPECT_CALL(sdbusMock, sd_bus_message_at_end(IsNull(), 0))
+        .WillOnce(Return(0))
+        .WillOnce(Return(0))
+        .WillOnce(Return(1)); // So it exits the loop after reading two strings.
+
+    // std::string
+    EXPECT_CALL(sdbusMock, sd_bus_message_read_basic(IsNull(), 's', _))
+        .WillOnce(Invoke([&](sd_bus_message*, char, void* p) {
+            const char** s = static_cast<const char**>(p);
+            // Read the first parameter, the string.
+            *s = path0;
+            return 0;
+        }))
+        .WillOnce(Invoke([&](sd_bus_message*, char, void* p) {
+            const char** s = static_cast<const char**>(p);
+            // Read the first parameter, the string.
+            *s = path1;
+            return 0;
+        }));
+
+    EXPECT_CALL(sdbusMock, sd_bus_message_exit_container(IsNull()))
+        .WillOnce(Return(0)); /* end of std::vector */
+
+    auto ret = utils::getPSUInventoryPath(bus);
+    EXPECT_EQ(2u, ret.size());
+    EXPECT_EQ(path0, ret[0]);
+    EXPECT_EQ(path1, ret[1]);
+}