Add coverage

Signed-off-by: Joe Grund <[email protected]>

.github/workflows/rust.yml

@@ -12,7 +12,7 @@ jobs:
     name: Check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
@@ -26,7 +26,7 @@ jobs:
     name: Test Suite
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
@@ -39,7 +39,7 @@ jobs:
     name: Rustfmt
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
@@ -54,7 +54,7 @@ jobs:
     name: Clippy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
@@ -63,3 +63,29 @@ jobs:
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           args: --locked -- -D warnings -D clippy::unwrap_used
+
+  coverage:
+    name: coverage
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Install `cargo-llvm-cov`
+        uses: taiki-e/install-action@cargo-llvm-cov
+
+      - name: Measure code coverage for all tests
+        run: |
+          # Fail if any tests fail
+          set -e
+          set -o pipefail
+          cargo llvm-cov --all-features --workspace --codecov --output-path codecov.json
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: codecov.json
+          fail_ci_if_error: true