nextest with coverage

.github/workflows/ci.yml

@@ -25,9 +25,47 @@ jobs:
     runs-on: ubuntu-latest
     needs:
       - tests
+      - nextest_with_coverage
     steps:
       - run: exit 0
 
+  nextest_with_coverage:
+    name: nextest_with_coverage
+    needs:
+      - basics
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        # Nightly Rust is used for cargo llvm-cov --doc below.
+      - name: Install Rust ${{ env.rust_nightly }}
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: ${{ env.rust_nightly }}
+          components: llvm-tools-preview
+      - uses: Swatinem/rust-cache@v2
+
+      - name: Install cargo-nextest
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-nextest
+      - name: Install cargo-llvm-cov
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-llvm-cov
+
+      - name: Collect coverage data
+        # Generate separate reports for nextest and doctests, and combine them.
+        run: |
+          cargo llvm-cov --no-report nextest
+          cargo llvm-cov --no-report --doc
+          cargo llvm-cov report --doctests --lcov --output-path lcov.info
+      - name: Upload coverage data to codecov
+        uses: codecov/codecov-action@v5
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+        with:
+          files: lcov.info
+
   tests:
     name: tests
     runs-on: ubuntu-latest

.gitignore

@@ -5,3 +5,7 @@ Cargo.lock
 .cargo/config
 
 .vscode/
+
+# coverage
+**/*.profraw
+lcov.info