[CI] Measure code coverage after unit test

extras/test/unit/.gitignore

@@ -1 +1,2 @@
 build/
+lcov*

extras/test/unit/CMakeLists.txt

@@ -18,11 +18,13 @@ add_executable(${PROJECT_NAME} ${TEST_SOURCES})
 target_include_directories(${PROJECT_NAME} PUBLIC include)
 
 # link RadioLib
-target_link_libraries(${PROJECT_NAME} RadioLib fmt)
+target_link_libraries(${PROJECT_NAME} RadioLib fmt gcov)
 
 # set target properties and options
 set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 20)
-target_compile_options(${PROJECT_NAME} PRIVATE -Wall -Wextra)
+set(BUILD_FLAGS -Wall -Wextra -fprofile-arcs -ftest-coverage -O0)
+target_compile_options(${PROJECT_NAME} PRIVATE ${BUILD_FLAGS})
+target_compile_options(RadioLib PRIVATE ${BUILD_FLAGS})
 
 # set RadioLib debug
 #target_compile_definitions(RadioLib PUBLIC RADIOLIB_DEBUG_BASIC RADIOLIB_DEBUG_SPI RADIOLIB_DEBUG_PROTOCOL)

extras/test/unit/coverage.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -e
+filename="lcov"
+rm -rf $filename.*
+lcov --capture --directory build --output-file "${filename}.info"
+
+# filter out boost and C++ standard library
+lcov --remove "${filename}.info" "/usr/*/boost/*" "/usr/include/c++/*" --output-file "${filename}.info"
+
+# generate HTML
+genhtml "${filename}.info" --output-directory "${filename}.report"
+zip -r "${filename}.report.zip" "${filename}.report"