Add a git action for coverage

This action will generate codes coverage for unit tests.

.github/workflows/codecov.yml

@@ -0,0 +1,38 @@
+name: generate unit tests coverage
+on: [pull_request]
+jobs:
+  run:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+
+      - name: build
+        shell: bash
+        run: |
+          cmake -S . -B build -DCMAKE_BUILD_TYPE=Release -Dmca_GENERATE_COVERAGE=on
+          cmake --build build
+
+      - name: Install LCOV
+        shell: bash
+        run: |
+          sudo apt-get --assume-yes install lcov > /dev/null
+
+      - name: run test
+        shell: bash
+        run: ./build/test/mca_unit_test
+
+      - name: lcov collection
+        shell: bash
+        run: |
+          cd build
+          lcov -c -d ./ -o cover.info
+
+      - name: Upload coverage reports to Codecov
+        uses: codecov/[email protected]
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          file: build/cover.info
+          verbose: true

CMakeLists.txt

@@ -13,6 +13,11 @@ endif()
 
 option(mca_BUILD_SHARE_LIB "Build shared libraries rather than static libraries" on)
 option(mca_BUILD_TEST "Whether or not to build unit test" on)
+option(mca_GENERATE_COVERAGE "Whether or not to generate codes coverage report" off)
+
+if (mca_GENERATE_COVERAGE)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fprofile-arcs -ftest-coverage")
+endif()
 
 aux_source_directory(src mca_SOURCE)