Add code coverage

Author: sunsided

.github/workflows/rust.yml

@@ -18,7 +18,21 @@ jobs:
     - uses: actions/checkout@v3
     - name: Build
       run: cargo build --verbose
-    - name: Run tests
-      run: cargo test --verbose
     - name: Run doctests
       run: cargo test --doc --verbose
+
+    - 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

README.md

@@ -1,5 +1,7 @@
 # Sudoku Solver, take 2
 
+[![codecov](https://codecov.io/gh/sunsided/sudoku2-rs/graph/badge.svg?token=AZ7Q2JU140)](https://codecov.io/gh/sunsided/sudoku2-rs)
+
 Another take at Sudoku solving in Rust. This is a weekend-ish remake of my previous pet project
 at [sunsided/rust-sudoku-solver](https://github.com/sunsided/rust-sudoku-solver).
 Unlike the previous experiment, this solver correctly solves Hypersudokus and requires fewer branches.