Add coverage test

.github/workflows/tests-ubuntu.yaml

@@ -116,6 +116,84 @@ jobs:
           path: ${{matrix.image}}_${{matrix.backend}}.tar
           retention-days: 1
 
+  coverage-test:
+    if: github.ref_name != 'main'
+    strategy:
+      fail-fast: false
+      matrix:
+        image: ['latest']
+        backend:
+          - name: 'cpu'
+            c_compiler: 'gcc'
+            cxx_compiler: 'g++'
+        cxx_version: ['17']
+        cmake_build_type: ['Debug']
+    runs-on: ubuntu-latest
+    needs: [docker-build, id_repo]
+    steps:
+      - name: Free Disk Space (Ubuntu)
+        uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be  # v1.3.1
+        with: {tool-cache: true, large-packages: false}
+      - name: Checkout built branch
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
+        with:
+          submodules: true
+      - name: Collect image artifact
+        if: needs.id_repo.outputs.in_base_repo == 'false'
+        uses: actions/download-artifact@95815c38cf2ff2164869cbab79da8d1f422bc89e  # v4.2.1
+        with:
+          name: |
+            ${{matrix.image}}_${{matrix.backend.name}}-artifact
+      - name: Load image artifact into docker
+        if: needs.id_repo.outputs.in_base_repo == 'false'
+        run: |
+          docker load < ${{matrix.image}}_${{matrix.backend.name}}.tar
+          rm ${{matrix.image}}_${{matrix.backend.name}}.tar
+      - name: Coverage test
+        run: |
+          cat<<-'EOF' > run.sh
+            set -xe
+            git config --global --add safe.directory '*'
+
+            export CMAKE_BUILD_PARALLEL_LEVEL=4
+            export CMAKE_BUILD_TYPE=${{matrix.cmake_build_type}}
+
+            export CC=${{matrix.backend.c_compiler}}
+            export CXX=${{matrix.backend.cxx_compiler}}
+
+            cmake \
+              -D CMAKE_CXX_STANDARD=${{matrix.cxx_version}} \
+              -D CMAKE_CXX_FLAGS="--coverage -fprofile-update=atomic" \
+              -D DDC_BUILD_BENCHMARKS=OFF \
+              -D DDC_BUILD_EXAMPLES=OFF \
+              -D Kokkos_ENABLE_DEPRECATED_CODE_4=OFF \
+              -D Kokkos_ENABLE_DEPRECATION_WARNINGS=OFF \
+              -B build
+
+            cmake --build build
+            ctest --test-dir build
+
+            gcovr \
+              --exclude-throw-branches \
+              --filter include/ddc \
+              --lcov coverage.lcov \
+              --merge-mode-functions=merge-use-line-0 \
+              build
+          EOF
+
+          docker run \
+            --user 0 \
+            --workdir ${{github.workspace}} \
+            --volume ${{github.workspace}}:${{github.workspace}} \
+            ghcr.io/cexa-project/ddc/${{matrix.image}}_${{matrix.backend.name}}:${GITHUB_SHA:0:7} \
+            bash run.sh
+      - name: Upload coverage reports to Codecov with GitHub Action
+        uses: codecov/codecov-action@ad3126e916f78f00edff4ed0317cf185271ccc2d  # v5.4.2
+        with:
+          files: coverage.lcov
+          disable_search: true
+          token: ${{secrets.CODECOV_TOKEN}}
+
   test:
     if: github.ref_name != 'main'
     strategy:

codecov.yaml

@@ -0,0 +1,13 @@
+# Copyright (C) The DDC development team, see COPYRIGHT.md file
+#
+# SPDX-License-Identifier: MIT
+
+---
+coverage:
+  status:
+    project:
+      default:
+        target: auto  # auto compares coverage to the previous base commit
+    patch:
+      default:
+        target: 100%

docker/latest/Dockerfile

@@ -51,6 +51,9 @@ RUN chmod +x /bin/bash_run \
     liblapacke-dev \
     libhwloc-dev \
     pkg-config \
+    pipx \
+ && python3 -m pipx install gcovr \
+ && python3 -m pipx ensurepath \
  # Installing cmake < 3.28 to workaround issue with Kokkos
  && wget https://github.com/Kitware/CMake/releases/download/v3.27.9/cmake-3.27.9-linux-x86_64.tar.gz \
  && tar -xvf cmake-3.27.9-linux-x86_64.tar.gz --directory /opt \