Integrate GoogleTest framework for unit tests (#197)

* Update package/tests/CMakeLists.txt to pull gtest

Added option to toggle pulling gtest

* Updated README.md with info on building gtest

Updated build-test.sh to turn on building gtest

.github/scripts/build-test.sh

@@ -18,7 +18,7 @@ if [ -z "$CMAKE" ]; then
 fi
 
 # For debugging, handy to print what we're doing
-cmd="$CMAKE -DCMAKE_CXX_COMPILER=$CXX -DCMAKE_C_COMPILER=$CC $CMAKE_EXTRA /mnt"
+cmd="$CMAKE -DCMAKE_CXX_COMPILER=$CXX -DCMAKE_C_COMPILER=$CC -DBUILD_GTESTS=ON $CMAKE_EXTRA /mnt"
 echo $cmd
 $cmd
 make -j 4

CMakeLists.txt

@@ -35,6 +35,12 @@ endif()
 set(BUILD_BENCHMARK_LOG "${BUILD_BENCHMARK_LOG}"
   CACHE BOOL "Build binary that benchmarks spdlog speed" FORCE)
 
+if(NOT BUILD_GTESTS)
+  set(BUILD_GTESTS OFF)
+endif()
+set(BUILD_GTESTS "${BUILD_GTESTS}"
+  CACHE BOOL "Add the value tests (dependent on gtest)" FORCE)
+
 # Define a default build type when using a single-mode tool like make/ninja
 # We make this default to Release, unless profiling is enabled, in which
 # case do RelWithDebInfo (bcause you need the debug symbols)

README.md

@@ -67,6 +67,9 @@ The tests in prmon now run in Python3. If your environment does not
 support Python3 properly it is possible to use Python2 for the tests
 by setting `-DPYTHON_TEST=python2`.
 
+To enable pulling and building gtest framework as well as tests dependent on gtest, 
+build with `-DBUILD_GTESTS=ON`.
+
 ### Creating a package with CPack
 
 A cpack based package can be created by invoking

package/tests/CMakeLists.txt

@@ -9,6 +9,21 @@ target_link_libraries(io-burner PRIVATE Threads::Threads)
 
 add_executable(mem-burner mem-burner.cpp)
 
+if (${CMAKE_VERSION} VERSION_GREATER "3.14.0" AND BUILD_GTESTS)
+
+    include(FetchContent)
+    FetchContent_Declare(
+    googletest
+    URL https://github.com/google/googletest/archive/609281088cfefc76f9d0ce82e1ff6c30cc3591e5.zip
+    )
+    set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+    FetchContent_MakeAvailable(googletest)
+    enable_testing()
+
+    include(GoogleTest)
+
+endif()
+
 # Custom targets for handling scripted wrappers for tests
 function(script_install)
     cmake_parse_arguments(SCRIPT_INSTALL "" "SCRIPT;DESTINATION" "" ${ARGN})