feat: code coverage

.github/workflows/coverage.yml

@@ -0,0 +1,35 @@
+name: coverage
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  coverage:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor != 'dependabot[bot]' }}
+    name: Coverage
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly
+          components: llvm-tools-preview
+      - name: Test
+        run: cargo test --features coverage
+        env:
+          RUSTFLAGS: "-Cinstrument-coverage"
+          RUSTDOCFLAGS: "-Cinstrument-coverage"
+          LLVM_PROFILE_FILE: "${{ github.workspace }}/default_%m_%p.profraw"
+      - name: Collect coverage
+        run: |
+          curl -sL https://github.com/mozilla/grcov/releases/download/v0.8.19/grcov-x86_64-unknown-linux-gnu.tar.bz2 | tar -xjf-
+          ./grcov . --binary-path ./target/debug/deps/ -s . -t lcov --branch --ignore-not-existing --keep-only 'src/*' --ignore '**/tests.rs' -o coverage.lcov
+      - name: Submit coverage
+        uses: codecov/codecov-action@v4
+        with:
+          fail_ci_if_error: true
+          files: ./coverage.lcov
+          token: ${{ secrets.CODECOV_TOKEN }}