Add initial unit tests

Signed-off-by: Lei YU <yulei.sh@bytedance.com>
Change-Id: Id4850e52073ea6780a978c6cd5a5c439aa8ed846
diff --git a/src/sdbus_wrapper.cpp b/src/sdbus_wrapper.cpp
new file mode 100644
index 0000000..a781036
--- /dev/null
+++ b/src/sdbus_wrapper.cpp
@@ -0,0 +1,9 @@
+#include "sdbus_wrapper.hpp"
+
+#include <ipmid/api.h>
+
+sdbusplus::bus::bus& getBus()
+{
+    static sdbusplus::bus::bus bus(ipmid_get_sd_bus_connection());
+    return bus;
+}