Add code coverage in GitHub Actions

Author: sunsided

.github/workflows/rust.yml

@@ -11,14 +11,29 @@ env:
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
-
     steps:
-    - uses: actions/checkout@v3
-    - name: Build
-      run: cargo build --verbose
-    - name: Run tests
-      run: cargo test --tests --verbose --features=unsafe
-    - name: Run doctests
-      run: cargo test --doc --verbose --features=unsafe
+      - uses: actions/checkout@v3
+      - name: Check format
+        run: cargo fmt --check
+      - name: Clippy
+        run: cargo clippy
+      - name: Build
+        run: cargo build --verbose
+      - name: Run doctests
+        run: cargo test --doc --verbose --all-features
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: llvm-tools-preview
+      - name: Install cargo-llvm-cov
+        uses: taiki-e/install-action@cargo-llvm-cov
+      - name: Install nextest
+        uses: taiki-e/install-action@nextest
+      - name: Generate code coverage
+        run: cargo llvm-cov nextest --all-features --workspace --lcov --output-path lcov.info
+      - name: Upload coverage to Codecov
+        uses: codecov/[email protected]
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: lcov.info
+          fail_ci_if_error: true