Add unit test for watches created on object paths

Verify the watches created for the object path being watched
for 'interfaces added' signal.

Resolves openbmc/openbmc#3003

Change-Id: I88a3adbbe91fcbe5bdf606d2f460d4d0c6d9c1a2
Signed-off-by: Marri Devender Rao <devenrao@in.ibm.com>
diff --git a/src/test/interfaceaddtest.cpp b/src/test/interfaceaddtest.cpp
new file mode 100644
index 0000000..d80f437
--- /dev/null
+++ b/src/test/interfaceaddtest.cpp
@@ -0,0 +1,28 @@
+#include <array>
+#include <string>
+#include <gtest/gtest.h>
+#include "pathwatchimpl.hpp"
+#include "event.hpp"
+
+using namespace std::string_literals;
+using namespace phosphor::dbus::monitoring;
+
+#include "interfaceaddtest.hpp"
+
+const std::array<std::string, 1> expectedPaths = {
+    "/xyz/openbmc_project/testing/inst1"s,
+};
+
+const std::array<std::string, 1> expectedWatches = {
+    "/xyz/openbmc_project/testing/inst1"s,
+};
+
+TEST(InterfaceAddTest, PathsSameSize)
+{
+    ASSERT_EQ(sizeof(expectedPaths), sizeof(paths));
+}
+
+TEST(InterfaceAddTest, WatchSameSize)
+{
+    ASSERT_EQ(expectedWatches.size(), pathwatches.size());
+}
\ No newline at end of file