add go unit test

paddle/CMakeLists.txt

@@ -9,6 +9,10 @@ add_subdirectory(pserver)
 add_subdirectory(trainer)
 add_subdirectory(scripts)
 
+if(${CMAKE_Go_COMPILER})
+  add_subdirectory(go)
+endif()
+
 find_package(Boost QUIET)
 
 if(Boost_FOUND)

paddle/go/CMakeLists.txt

+include_directories(${CMAKE_CURRENT_BINARY_DIR})
+
+go_library(adder SRCS adder.go)
+
+# cc_test(cgo_test
+#         SRCS
+#         cgo_test.cc
+#         DEPS
+#         adder)
+add_executable(cgo_test cgo_test.cc)
+add_dependencies(cgo_test adder)
+target_link_libraries(cgo_test ${GTEST_LIBRARIES} ${GTEST_MAIN_LIBRARIES} adder)
+add_test(cgo_test cgo_test)

paddle/go/adder.go

+package main
+
+import "C"
+
+//export GoAdder
+func GoAdder(x, y int) int {
+	return x + y
+}
+
+func main() {} // Required but ignored

paddle/go/cgo_test.cc

+#include "libadder.h"
+#include <iostream>
+#include "gtest/gtest.h"
+
+TEST(Cgo, Invoke) {
+  EXPECT_EQ(GoAdder(30, 12), 42);
+}