ci: add code coverage

.codecov.yml

@@ -0,0 +1,15 @@
+comment: false
+
+coverage:
+  status:
+    project:
+      default:
+        threshold: 100% # make CI green
+    patch:
+      default:
+        threshold: 100% # make CI green
+
+ignore:
+  - "**/tests"
+  - "**/benches"
+  - "**/examples"

.github/workflows/coverage.yml

@@ -0,0 +1,39 @@
+name: Coverage
+
+on:
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: actions-rust-lang/[email protected]
+        with:
+          components: llvm-tools-preview
+
+      - name: Install just & cargo-llvm-cov
+        uses: taiki-e/[email protected]
+        with:
+          tool: just,cargo-llvm-cov
+
+      - name: Generate code coverage
+        run: just test-coverage-codecov
+
+      - name: Upload coverage to Codecov
+        uses: codecov/[email protected]
+        with:
+          files: codecov.json
+          fail_ci_if_error: true
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

crates/oas3/README.md

@@ -8,7 +8,7 @@
 ![MIT or Apache 2.0 licensed](https://img.shields.io/crates/l/oas3.svg)
 <br />
 [![CI](https://github.com/x52dev/oas3-rs/actions/workflows/ci.yml/badge.svg)](https://github.com/x52dev/oas3-rs/actions/workflows/ci.yml)
-[![codecov](https://codecov.io/gh/x52dev/oas3/branch/main/graph/badge.svg)](https://codecov.io/gh/x52dev/oas3)
+[![codecov](https://codecov.io/gh/x52dev/oas3-rs/branch/main/graph/badge.svg)](https://codecov.io/gh/x52dev/oas3-rs)
 ![Version](https://img.shields.io/crates/msrv/oas3.svg)
 [![Download](https://img.shields.io/crates/d/oas3.svg)](https://crates.io/crates/oas3)
 

justfile

@@ -55,6 +55,14 @@ test toolchain="":
     cargo {{ toolchain }} test --doc --workspace --all-features
     RUSTDOCFLAGS="-D warnings" cargo {{ toolchain }} doc --workspace --no-deps --all-features
 
+# Test workspace and generate Codecov coverage file
+test-coverage-codecov toolchain="":
+    cargo {{ toolchain }} llvm-cov --workspace --all-features --codecov --output-path codecov.json
+
+# Test workspace and generate LCOV coverage file
+test-coverage-lcov toolchain="":
+    cargo {{ toolchain }} llvm-cov --workspace --all-features --lcov --output-path lcov.info
+
 # Document crates in workspace.
 doc *args:
     RUSTDOCFLAGS="--cfg=docsrs -Dwarnings" cargo +nightly doc --workspace --all-features {{ args }}