Build and test with Xcode in CI

.github/actions/prepare-simulator/action.yml

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+name: "Prepare simulator"
+description: "Creates and boots a custom simulator"
+inputs:
+  runtime:
+    description: "Runtime name"
+    required: true
+  device:
+    description: "Device name"
+    required: true
+outputs:
+  destination-id:
+    description: "Destination simulator ID"
+    value: ${{ steps.simulator.outputs.destination-id }}
+runs:
+  using: composite
+  steps:
+    - name: "Install runtime"
+      shell: bash
+      run: |
+        RUNTIME="${{ inputs.runtime }}"
+        if xcrun simctl list | grep "$RUNTIME"
+        then
+          echo "$RUNTIME is already installed.";
+        else
+          echo "::group::Available runtimes:"
+          xcodes runtimes
+          echo "::endgroup::"
+          sudo xcodes runtimes install "$RUNTIME" --keep-archive;
+        fi
+
+    - name: "Create and boot simulator"
+      id: simulator
+      shell: bash
+      run: |
+        RUNTIME="${{ inputs.runtime }}"
+        DEVICE="${{ inputs.device }}"
+
+        DEVICE_ID=$(xcrun simctl list devicetypes -j | jq -r ".devicetypes.[] | select(.name==\"$DEVICE\").identifier")
+        echo $DEVICE_ID
+        if [ $(echo $DEVICE_ID | wc -l) != 1 ] || [ "$DEVICE_ID" = ""  ]; then echo "Invalid Device ID"; exit 1; fi
+
+        RUNTIME_ID=$(xcrun simctl list runtimes -j | jq -r ".runtimes.[] | select(.name==\"$RUNTIME\").identifier")
+        echo $RUNTIME_ID
+        if [ $(echo $RUNTIME_ID | wc -l) != 1 ] || [ "$RUNTIME_ID" = ""  ]; then echo "Invalid Runtime ID"; exit 1; fi
+
+        DESTINATION_ID=$(xcrun simctl create "Custom: $DEVICE, $RUNTIME" $DEVICE_ID $RUNTIME_ID)
+        xcrun simctl boot $DESTINATION_ID
+        echo "destination-id=$(echo $DESTINATION_ID)" >> $GITHUB_OUTPUT

.github/workflows/xcode.yml

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+name: Xcode
+
+on:
+  pull_request:
+  push:
+    branches: [develop, release]
+
+jobs:
+  simulator:
+    name: "${{ matrix.scheme }}, Xcode ${{ matrix.env.xcode }}, ${{ matrix.env.runtime }}, ${{ matrix.env.device }}"
+    runs-on: macOS-26
+    strategy:
+      fail-fast: false
+      matrix:
+        scheme:
+          - "Base16"
+          - "Base32"
+        env:
+          - xcode: 26.4
+            runtime: "iOS 26.4"
+            device: "iPhone 17 Pro Max"
+          - xcode: 26.4
+            runtime: "watchOS 26.4"
+            device: "Apple Watch Series 11 (46mm)"
+          - xcode: 26.4
+            runtime: "tvOS 26.4"
+            device: "Apple TV 4K (3rd generation)"
+          - xcode: 26.4
+            runtime: "visionOS 26.4"
+            device: "Apple Vision Pro"
+    steps:
+      - uses: actions/checkout@v6
+      - name: "Select Xcode ${{ matrix.env.xcode }}"
+        uses: ./.github/actions/xcode-select
+        with:
+          version: ${{ matrix.env.xcode }}
+      - name: "Cache downloaded simulator runtimes"
+        uses: actions/cache@v5
+        with:
+          path: ~/Downloads/*.dmg
+          key: Xcode ${{ matrix.env.xcode }}+${{ matrix.env.runtime }}
+      - name: "Prepare simulator"
+        id: prepare-simulator
+        uses: ./.github/actions/prepare-simulator
+        with:
+          runtime: ${{ matrix.env.runtime }}
+          device: ${{ matrix.env.device }}
+      - name: "Build and test"
+        run: xcodebuild test -scheme "${{ matrix.scheme }}" -destination "id=${{ steps.prepare-simulator.outputs.destination-id }}"
+      - uses: sersoft-gmbh/swift-coverage-action@v5
+        with:
+          target-name-filter: ^Identifier$
+      - uses: codecov/codecov-action@v6
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: true
+
+  macos:
+    name: "${{ matrix.scheme }}, Xcode ${{ matrix.xcode }}, macOS 26"
+    runs-on: macOS-26
+    strategy:
+      fail-fast: false
+      matrix:
+        scheme:
+          - "Base16"
+          - "Base32"
+        xcode:
+          - "26.4"
+    steps:
+      - uses: actions/checkout@v6
+      - name: "Select Xcode ${{ matrix.xcode }}"
+        uses: ./.github/actions/xcode-select
+        with:
+          version: ${{ matrix.xcode }}
+      - name: "Build and test"
+        run: xcodebuild test -scheme "${{ matrix.scheme }}" -destination "name=My Mac"
+      - uses: sersoft-gmbh/swift-coverage-action@v5
+        with:
+          target-name-filter: ^Identifier$
+      - uses: codecov/codecov-action@v6
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: true