Add the packet_injector tool to test the packet injection effect

test/gtest_build_tcp_packet.cpp

@@ -0,0 +1,63 @@
+#include <gtest/gtest.h>
+
+#include "inject_priv.h"
+
+/******************************************************************************
+ * BUILD_TCP_PACKET
+ ******************************************************************************/
+
+// IPv4
+TEST(BUILD_IPV4_BASED_TCP_PACKET, WITH_RST)
+{
+    // TODO
+}
+
+TEST(BUILD_IPV4_BASED_TCP_PACKET, WITH_FIN)
+{
+    // TODO
+}
+
+TEST(BUILD_IPV4_BASED_TCP_PACKET, WITH_PAYLOD)
+{
+    // TODO
+}
+
+// IPv6
+TEST(BUILD_IPV6_BASED_TCP_PACKET, WITH_RST)
+{
+    // TODO
+}
+
+TEST(BUILD_IPV6_BASED_TCP_PACKET, WITH_FIN)
+{
+    // TODO
+}
+
+TEST(BUILD_IPV6_BASED_TCP_PACKET, WITH_PAYLOD)
+{
+    // TODO
+}
+
+// IPv4 + IPv6
+TEST(BUILD_IPV4_IPV6_BASED_TCP_PACKET, WITH_RST)
+{
+    // TODO
+}
+
+// IPv6 + IPv4
+TEST(BUILD_IPV6_IPV4_BASED_TCP_PACKET, WITH_RST)
+{
+    // TODO
+}
+
+// GRE
+TEST(BUILD_GRE_BASED_TCP_PACKET, WITH_RST)
+{
+    // TODO
+}
+
+int main(int argc, char **argv)
+{
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}