Add GitHub action for unit tests

Author: BobLd

.github/workflows/unit-tests.yml

@@ -0,0 +1,101 @@
+name: Unit Tests
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+  workflow_dispatch:
+
+env:
+  DOTNET_NOLOGO: true
+  DOTNET_CLI_TELEMETRY_OPTOUT: true
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
+
+jobs:
+  test:
+    name: ${{ matrix.os }}-${{ matrix.arch }} / ${{ matrix.framework }}
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          # ---------- Windows x64 ----------
+          - { runner: windows-latest,  os: windows, arch: x64,   framework: net462 }
+          - { runner: windows-latest,  os: windows, arch: x64,   framework: net6.0 }
+          - { runner: windows-latest,  os: windows, arch: x64,   framework: net8.0 }
+          - { runner: windows-latest,  os: windows, arch: x64,   framework: net9.0 }
+
+          # ---------- Windows ARM64 ----------
+          # .NET Framework (net462) is not supported on ARM64.
+          - { runner: windows-11-arm,  os: windows, arch: arm64, framework: net6.0 }
+          - { runner: windows-11-arm,  os: windows, arch: arm64, framework: net8.0 }
+          - { runner: windows-11-arm,  os: windows, arch: arm64, framework: net9.0 }
+
+          # ---------- Linux x64 ----------
+          - { runner: ubuntu-latest,   os: linux,   arch: x64,   framework: net6.0 }
+          - { runner: ubuntu-latest,   os: linux,   arch: x64,   framework: net8.0 }
+          - { runner: ubuntu-latest,   os: linux,   arch: x64,   framework: net9.0 }
+
+          # ---------- Linux ARM64 ----------
+          - { runner: ubuntu-24.04-arm, os: linux,  arch: arm64, framework: net6.0 }
+          - { runner: ubuntu-24.04-arm, os: linux,  arch: arm64, framework: net8.0 }
+          - { runner: ubuntu-24.04-arm, os: linux,  arch: arm64, framework: net9.0 }
+
+          # ---------- macOS ARM64 (Apple Silicon) ----------
+          - { runner: macos-latest,    os: macos,   arch: arm64, framework: net6.0 }
+          - { runner: macos-latest,    os: macos,   arch: arm64, framework: net8.0 }
+          - { runner: macos-latest,    os: macos,   arch: arm64, framework: net9.0 }
+
+          # ---------- macOS x64 (Intel) ----------
+          - { runner: macos-13,        os: macos,   arch: x64,   framework: net6.0 }
+          - { runner: macos-13,        os: macos,   arch: x64,   framework: net8.0 }
+          - { runner: macos-13,        os: macos,   arch: x64,   framework: net9.0 }
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: |
+            6.0.x
+            8.0.x
+            9.0.x
+
+      - name: NuGet cache
+        uses: actions/cache@v4
+        with:
+          path: ~/.nuget/packages
+          key: nuget-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('**/*.csproj') }}
+          restore-keys: |
+            nuget-${{ runner.os }}-${{ runner.arch }}-
+
+      - name: Restore
+        run: dotnet restore UglyToad.PdfPig.Rendering.Skia.Tests/UglyToad.PdfPig.Rendering.Skia.Tests.csproj
+
+      - name: Build
+        run: >
+          dotnet build UglyToad.PdfPig.Rendering.Skia.Tests/UglyToad.PdfPig.Rendering.Skia.Tests.csproj
+          --framework ${{ matrix.framework }}
+          --configuration Release
+          --no-restore
+
+      - name: Test
+        run: >
+          dotnet test UglyToad.PdfPig.Rendering.Skia.Tests/UglyToad.PdfPig.Rendering.Skia.Tests.csproj
+          --framework ${{ matrix.framework }}
+          --configuration Release
+          --no-build
+          --logger "trx;LogFileName=test-results.trx"
+          --logger "console;verbosity=normal"
+          --results-directory ./TestResults
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results-${{ matrix.os }}-${{ matrix.arch }}-${{ matrix.framework }}
+          path: ./TestResults/**/*.trx
+          if-no-files-found: ignore