Add Approval Tests for cpp

* Add testcase using https://github.com/approvals/ApprovalTests.cpp and google test.
* Change google test to be downloaded if not installed with cmake
* Add a run-once-cmake.sh script to build and test with cmake
* Add a run-approval-once.sh script to build and run approval test

cpp/CMakeLists.txt

@@ -6,25 +6,62 @@ project(cpp)
 set(CMAKE_THREAD_LIBS_INIT pthread)
 
 enable_testing()
-find_package(GTest REQUIRED)
+find_package(GTest)
+
+include(ExternalProject)
+if(NOT ${GTEST_FOUND}) # Download gtest if not installed
+    message("No system gtest use external project")
+    ExternalProject_Add(googletest
+      GIT_REPOSITORY    https://github.com/google/googletest.git
+      GIT_TAG           master
+      SOURCE_DIR        "${CMAKE_BINARY_DIR}/googletest-src"
+      BINARY_DIR        "${CMAKE_BINARY_DIR}/googletest-build"
+      CONFIGURE_COMMAND ""
+      BUILD_COMMAND     ""
+      INSTALL_COMMAND   ""
+      TEST_COMMAND      ""
+    )
+    add_subdirectory(${CMAKE_BINARY_DIR}/googletest-src
+                 ${CMAKE_BINARY_DIR}/googletest-build
+                 EXCLUDE_FROM_ALL)
+    set(GTEST_BOTH_LIBRARIES gtest gtest_main)
+endif()
+
+ExternalProject_Add(aprovaltest
+    PREFIX ${CMAKE_BINARY_DIR}/aprovaltest
+    URL https://github.com/approvals/ApprovalTests.cpp/releases/download/v.2.0.0/ApprovalTests.v.2.0.0.hpp
+    DOWNLOAD_NO_EXTRACT 1
+    CONFIGURE_COMMAND ""
+    BUILD_COMMAND ""
+    INSTALL_COMMAND ""
+)
+
 include_directories(${GTEST_INCLUDE_DIRS})
+include_directories(${CMAKE_BINARY_DIR}/aprovaltest/src)
 
-set(GILDED_ROSE_SOURCE_FILES
+add_executable(GildedRose
     GildedRose.cc
     GildedRose.h
-    GildedRoseUnitTests.cc)
-
-set(GILDED_ROSE_TEXT_TESTS_SOURCE_FILES
-    GildedRose.cc
-    GildedRose.h
-    GildedRoseTextTests.cc)
-
-set(SOURCE_FILES
-    ${GILDED_ROSE_SOURCE_FILES}
-    ${GILDED_ROSE_TEXT_TESTS_SOURCE_FILES})
-
-add_executable(GildedRose ${GILDED_ROSE_SOURCE_FILES})
+    GildedRoseUnitTests.cc
+    )
 target_link_libraries(GildedRose ${GTEST_BOTH_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
+add_test(NAME GildedRose COMMAND GildedRose)
 
-add_executable(GildedRoseTextTests ${GILDED_ROSE_TEXT_TESTS_SOURCE_FILES})
+add_executable(GildedRoseTextTests
+    GildedRose.cc
+    GildedRose.h
+    GildedRoseTextTests.cc
+    )
 target_link_libraries(GildedRoseTextTests ${GTEST_BOTH_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
+add_test(NAME GildedRoseTextTests COMMAND GildedRoseTextTests)
+
+add_executable(GildedRoseApprovalTests
+    GildedRose.cc
+    GildedRose.h
+    GildedRoseApprovalTests.cc
+    GildedRoseApprovalMain.cc
+    )
+target_link_libraries(GildedRoseApprovalTests ${GTEST_BOTH_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
+set_property(TARGET GildedRoseApprovalTests PROPERTY CXX_STANDARD 14)
+add_dependencies(GildedRoseApprovalTests aprovaltest)
+add_test(NAME GildedRoseApprovalTests COMMAND GildedRoseApprovalTests)