Add lcov test coverage report

CMakeLists.txt

@@ -3,6 +3,9 @@ project(oc8-test VERSION 0.1.0 LANGUAGES C CXX)
 
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
+add_definitions(-fprofile-arcs -ftest-coverage)
+set(CMAKE_CXX_OUTPUT_EXTENSION_REPLACE ON)
+set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lgcov")
 
 include(CTest)
 include(CTestCoverageCollectGCOV)
@@ -15,7 +18,8 @@ FetchContent_Declare(
 
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DCMAKE_TEST")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DCMAKE_TEST -fprofile-arcs -ftest-coverage")
+set(OBJECT_DIR ${CMAKE_BINARY_DIR}/CMakeFiles/oc8-test.dir/src)
 FetchContent_MakeAvailable(googletest)
 
 enable_testing()
@@ -28,7 +32,22 @@ add_executable(oc8-test
 	src/tests/chip8_test.cc
 )
 
-target_link_libraries(oc8-test GTest::gtest_main)
+add_custom_target(lcov
+	COMMAND rm -rf lcov
+	COMMAND mkdir lcov
+	WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+)
+
+add_custom_command(TARGET lcov
+	COMMAND lcov -d ${OBJECT_DIR} -c -o ${CMAKE_BINARY_DIR}/lcov/coverage.info -rc lcov_branch_coverage=1 --ignore-errors mismatch
+	COMMAND lcov -r ${CMAKE_BINARY_DIR}/lcov/coverage.info "/usr/include/*" "${CMAKE_BINARY_DIR}/_deps/*" -o ${CMAKE_BINARY_DIR}/lcov/coverage.info --ignore-errors unused
+	COMMAND genhtml ${CMAKE_BINARY_DIR}/lcov/coverage.info --branch-coverage --output-directory ${CMAKE_BINARY_DIR}/lcov/html
+)
+
+add_test(oc8-test ${CMAKE_CURRENT_BINARY_DIR}/oc8-test)
+
+target_link_libraries(oc8-test GTest::gtest_main -fprofile-arcs)
 
 include(GoogleTest)
 gtest_discover_tests(oc8-test)
+