Add code coverage during CI testing

.codecov.yml

@@ -0,0 +1,5 @@
+# xref: https://docs.codecov.io/docs/codecovyml-reference
+
+# Disable annotations (annoying!)
+github_checks:
+  annotations: false

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ on:
 jobs:
   test:
     if: "!contains(github.event.head_commit.message, 'skip ci')"
-    name: ${{ matrix.os }} - ${{ matrix.compiler }} - ${{ github.event_name }}
+    name: ${{ matrix.os }} - ${{ matrix.compiler }} - ${{ matrix.test_type }} - ${{ github.event_name }}
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
@@ -36,10 +36,17 @@ jobs:
           - gfortran-13
         shell:
           - bash
+        test_type:
+          - regular
         include:
           - os: windows-latest
             compiler: gfortran
             shell: 'msys2 {0}'
+            test_type: regular
+          - os: ubuntu-latest
+            compiler: gfortran-13
+            shell: bash
+            test_type: coverage
     defaults:
       run:
         shell: ${{ matrix.shell }}
@@ -69,6 +76,34 @@ jobs:
       - name: Run test
         run: |
           install/bin/smesh_run
+          install/bin/smesh_run smesh_example.cfg
+          install/bin/smesh_run smesh_test.cfg
+      - name: Run tests for coverage
+        if: ${{ matrix.test_type == 'coverage' }}
+        run: |
+          sudo apt-get install -y lcov
+          mkdir build-coverage
+          cd build-coverage
+          cmake .. -DCMAKE_BUILD_TYPE=Debug -DWITH_COVERAGE=ON
+          cmake --build .
+          cd ..
+          cmake --build build-coverage/ --target reset-coverage
+          build-coverage/smesh_run
+          build-coverage/smesh_run smesh_example.cfg
+          build-coverage/smesh_run smesh_test.cfg
+          cmake --build build-coverage/ --target process-coverage
+      - uses: codecov/codecov-action@v3
+        if: ${{ matrix.test_type == 'coverage' }}
+        with:
+          files: ./build-coverage/lcov.info
+          flags: unittests
+          name: codecov-umbrella
+      - name: Coveralls
+        if: ${{ matrix.test_type == 'coverage' }}
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          path-to-lcov: ./build-coverage/lcov.info
       # Enable tmate debugging of manually-triggered workflows if the input option was provided
       - name: Setup tmate session for debugging
         if: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.debug_enabled && always() }}

.gitignore

@@ -1,3 +1,4 @@
 build/
+build-coverage/
 install/
 *.dat

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 3.5.1)
+cmake_minimum_required (VERSION 3.13.0)
 
 # Get project version from `VERSION` file
 file(READ "${CMAKE_SOURCE_DIR}/VERSION" version_file)
@@ -43,3 +43,21 @@ target_compile_options(smesh_io PRIVATE -Wall -Wextra -Werror -std=f2018)
 target_compile_options(smesh_run PRIVATE -Wall -Wextra -Werror -std=f2018)
 
 install(TARGETS smesh smesh_io smesh_run)
+
+# Handle code coverage generation
+option(WITH_COVERAGE "Generate code coverage" OFF)
+if (WITH_COVERAGE)
+    target_compile_options(smesh     PRIVATE -g --coverage -O0)
+    target_compile_options(smesh_io  PRIVATE -g --coverage -O0)
+    target_compile_options(smesh_run PRIVATE -g --coverage -O0)
+    target_link_options(smesh     PRIVATE --coverage)
+    target_link_options(smesh_io  PRIVATE --coverage)
+    target_link_options(smesh_run PRIVATE --coverage)
+
+    add_custom_target(reset-coverage
+      COMMAND lcov --directory . --zerocounters
+    )
+    add_custom_target(process-coverage
+      COMMAND lcov --directory . --capture --output-file lcov.info
+    )
+endif()

README.md

@@ -1,6 +1,8 @@
 # smesh
 
 [![Build Status](https://github.com/trixi-framework/smesh/workflows/CI/badge.svg)](https://github.com/trixi-framework/smesh/actions?query=workflow%3ACI)
+[![Coveralls](https://coveralls.io/repos/github/trixi-framework/smesh/badge.svg)](https://coveralls.io/github/trixi-framework/smesh)
+[![Codecov](https://codecov.io/gh/trixi-framework/smesh/branch/main/graph/badge.svg)](https://codecov.io/gh/trixi-framework/smesh)
 [![License: MIT](https://img.shields.io/badge/License-MIT-success.svg)](https://opensource.org/license/mit/)
 
 A simple Fortran package for generating and handling unstructured triangular and polygonal