First take, WIP

tests/CMakeLists.txt

@@ -1 +1,41 @@
+option(GCOV_ENABLE "Enable/use GCOV code coverage for tests" ON)
+option(GCOV_CONTINUE_ON_FAILURE "Continue and generate test report even if tests fail" ON)
+
+if (GCOV_ENABLE)
+	find_program(GCOV_BINARY NAMES gcov gcov-7)
+    find_program(LCOV_BINARY NAMES lcov)
+	message(STATUS "Using gcov ${GCOV_BINARY} and LCOV ${LCOV_BINARY}")
+	add_compile_options(-g -O0 -fprofile-arcs -ftest-coverage)
+	link_libraries(-coverage -lgcov)
+	set(CMAKE_CXX_OUTPUT_EXTENSION_REPLACE ON)
+    add_custom_target(tests_clean
+        WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
+        COMMAND ${CMAKE_COMMAND} -E remove_directory ${PROJECT_BINARY_DIR}/Coverage
+        COMMAND lcov -b ${PROJECT_BINARY_DIR} -d ${PROJECT_BINARY_DIR} --zerocounters
+    )
+
+    # TODO - right now this is kinda janky because some of the tests fail and this causes execution to abort. 
+    # Once they no longer do that we can merge this into the test_coverage_report step so it all runs seamlessly. 
+    # For now, build test_run_all and ignore the failure. Then build the test_coverage_report target.
+    add_custom_target(test_run_all
+        COMMAND cd ${PROJECT_BINARY_DIR} && env CTEST_OUTPUT_ON_FAILURE=1 ctest --timeout 30 || exit 0
+        DEPENDS tests_clean tests
+    )
+
+    add_custom_target(test_coverage_report
+        COMMAND cd ${PROJECT_BINARY_DIR}
+        COMMAND ${LCOV_BINARY} --capture --gcov-tool="${GCOV_BINARY}" --directory ${PROJECT_BINARY_DIR} --output-file ${PROJECT_BINARY_DIR}/coverage.info
+        # Strip system headers and other uninteresting stuff. 
+        COMMAND ${LCOV_BINARY} --remove coverage.info '/usr/*' '${PROJECT_SOURCE_DIR}/tests/*' '${PROJECT_SOURCE_DIR}/lib/Catch2/*' -o coverage.info
+        # Package it up. 
+        COMMAND genhtml coverage.info --output-directory Coverage
+        COMMAND tar -zcvf Coverage.tar.gz Coverage
+        # TODO - this needs to be fixed so it doesn't suck in all the catch/test cruft.
+    	#COMMAND ${PROJECT_SOURCE_DIR}/utils/gcovr.py -r ${PROJECT_SOURCE_DIR} -e '${PROJECT_SOURCE_DIR}/tests/*' -e Catch2 | tee ${PROJECT_BINARY_DIR}/summary.txt
+        #DEPENDS tests_clean tests
+    )
+else()
+    set(CMAKE_CXX_OUTPUT_EXTENSION_REPLACE OFF)
+endif()
+
 add_subdirectory(unit)