Simple Code Coverage analysis

.github/workflows/codecov.yml

@@ -0,0 +1,35 @@
+
+name: Codecov
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  codecov:
+    container:
+      image: swift:5.3.2-bionic
+    runs-on: ubuntu-latest
+    steps:
+    - run: apt-get update && apt-get install -y gtk+-3.0 libgtk+-3.0
+    - name: Checkout Branch
+      uses: actions/checkout@v2
+    - name: Build Test Target
+      run: swift build --enable-test-discovery -Xswiftc -profile-coverage-mapping -Xswiftc -profile-generate --product TokamakPackageTests
+    - name: Run Tests
+      run: swift test --enable-test-discovery --enable-code-coverage --skip-build
+    - name: Generate Branch Coverage Report
+      uses: mattpolzin/swift-codecov-action@0.6.1
+      id: cov
+      with:
+        MINIMUM_COVERAGE: 20
+    - name: Post Positive Results
+      if: ${{ success() }}
+      run: |
+        echo "::warning file=Package.swift,line=1,col=1::The current code coverage percentage is passing with ${{ steps.cov.outputs.codecov }} (minimum allowed: ${{ steps.cov.outputs.minimum_coverage }}%)."
+    - name: Post Negative Results
+      if: ${{ failure() }}
+      run: |
+        echo "::error file=Package.swift,line=1,col=1::The current code coverage percentage is failing with ${{ steps.cov.outputs.codecov }} (minimum allowed: ${{ steps.cov.outputs.minimum_coverage }}%)."
+