Add C++ implementation

cpp/tests/CMakeLists.txt

@@ -0,0 +1,15 @@
+project(tests)
+
+add_executable(${PROJECT_NAME}
+    ../statement.cpp
+    ../statement.h
+    test_statement.cpp
+    main.cpp)
+
+target_include_directories(
+    ${PROJECT_NAME}
+    PUBLIC
+    ../third_party ..)
+
+enable_testing()
+add_test(NAME ${PROJECT_NAME}_test COMMAND ${PROJECT_NAME})