Add code coverage

.github/workflows/swift-android.yml

@@ -0,0 +1,49 @@
+name: Swift Android
+
+on: [push]
+
+jobs:
+  android:
+    name: Android (unit tests)
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    # Cross-compiles the package for Android and runs the XCTest suite on an
+    # Android emulator (x86_64) provisioned by the action.
+    - name: Build and test on Android emulator
+      uses: skiptools/swift-android-action@v2
+      with:
+        swift-version: 6.3.3
+
+  android-armv7:
+    name: Android (armv7 cross-compile)
+    runs-on: ubuntu-latest
+    container: swift:6.3.3
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Install dependencies
+      run: apt-get update -y && apt-get install -y curl
+    - name: Install Swift Android SDK
+      # The Android SDK artifact bundle is only published for 6.3.3, and the
+      # host toolchain must match the bundle version exactly (Swift's module
+      # format isn't cross-patch-compatible) — hence the swift:6.3.3 container.
+      run: |
+        set -eux
+        url="https://download.swift.org/swift-6.3.3-release/android-sdk/swift-6.3.3-RELEASE/swift-6.3.3-RELEASE_android.artifactbundle.tar.gz"
+        curl -fsSL "$url" -o android.artifactbundle.tar.gz
+        swift sdk install android.artifactbundle.tar.gz \
+          --checksum d160cc3206dd1886dae3fef2337af5e25ec034692cd0ec225721c56cc69da7f5
+        swift sdk list
+    # armv7 can't run on the x86_64 emulator, so this is a cross-compile check
+    # only. The bundle installs as a single multi-arch SDK; the architecture is
+    # selected by target triple. Read the exact armv7 triple (with its
+    # API-level suffix) from the installed SDK metadata rather than pinning it.
+    - name: Build (armv7)
+      run: |
+        set -eux
+        TRIPLE=$(grep -rhoE 'armv7-unknown-linux-androideabi[0-9]*' ~/.swiftpm | sort -u | head -1)
+        test -n "$TRIPLE"
+        echo "Using target triple: $TRIPLE"
+        swift build --swift-sdk "$TRIPLE"

.github/workflows/swift-windows.yml

@@ -0,0 +1,21 @@
+name: Swift Windows
+
+on: [push]
+
+jobs:
+  windows:
+    name: Windows
+    runs-on: windows-latest
+    steps:
+    - uses: compnerd/gha-setup-swift@main
+      with:
+        branch: swift-6.3.3-release
+        tag: 6.3.3-RELEASE
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Swift Version
+      run: swift --version
+    - name: Build
+      run: swift build
+    - name: Test
+      run: swift test

.github/workflows/swift.yml

@@ -3,48 +3,68 @@ name: Swift
 on: [push]
 
 jobs:
-  mac:
+  macos:
     name: macOS
+    runs-on: macos-26
     strategy:
       matrix:
-        swift: [5.7.3]
-        os: [macos-latest]
-    runs-on: ${{ matrix.os }}
+        config: ["debug", "release"]
     steps:
-    - name: Install Swift
-      uses: slashmo/install-swift@v0.3.0
-      with:
-        version: ${{ matrix.swift }}
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
     - name: Swift Version
       run: swift --version
-    - name: Build (Debug)
-      run: swift build -c debug
-    - name: Build (Release)
-      run: swift build -c release
-    - name: Test (Debug)
-      run: swift test --configuration debug
+    - name: Build
+      run: swift build -c ${{ matrix.config }}
+    - name: Test
+      run: swift test -c ${{ matrix.config }}
 
   linux:
-    name: Linux
+    name: Linux (${{ matrix.container }})
+    runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
-        swift: [5.1.5, 5.5, 5.6.3, 5.7.3]
-        os: [ubuntu-20.04]
-    runs-on: ${{ matrix.os }}
+        container: ["swift:latest", "swiftlang/swift:nightly-noble"]
+        config: ["debug", "release"]
+    container: ${{ matrix.container }}
     steps:
-    - name: Install Swift
-      uses: slashmo/install-swift@v0.3.0
-      with:
-        version: ${{ matrix.swift }}
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
     - name: Swift Version
       run: swift --version
-    - name: Build (Debug)
-      run: swift build -c debug
-    - name: Build (Release)
-      run: swift build -c release
-    - name: Test (Debug)
-      run: swift test --configuration debug
+    - name: Build
+      run: swift build -c ${{ matrix.config }}
+    - name: Test
+      run: swift test -c ${{ matrix.config }}
+
+  coverage:
+    name: Code Coverage
+    runs-on: macos-26
+    permissions:
+      contents: read
+      code-quality: write # required by actions/upload-code-coverage
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Swift Version
+      run: swift --version
+    - name: Export coverage and enforce threshold
+      run: Scripts/coverage.sh 70
+    - name: Upload coverage to GitHub Code Quality
+      uses: actions/upload-code-coverage@v1
+      with:
+        file: .build/coverage/coverage.xml
+        language: Swift
+        label: code-coverage/llvm-cov
+        # Code Quality was in public preview until 2026-07-20; keep this while
+        # the repo might not have the feature enabled, so a failed upload
+        # doesn't break CI. Remove once GA is enabled everywhere.
+        fail-on-error: false
+    - name: Upload coverage artifacts
+      if: always()
+      uses: actions/upload-artifact@v4
+      with:
+        name: code-coverage
+        path: .build/coverage/
+        if-no-files-found: error