Try generating code coverage

Author: vHanda

.github/workflows/dart.yml

@@ -60,3 +60,28 @@ jobs:
       - name: Run VM tests
         run: dart test --platform vm
         if: always() && steps.install.outcome == 'success'
+
+  coverage:
+    needs: test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        sdk: [2.12.0]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: dart-lang/[email protected]
+        with:
+          sdk: ${{ matrix.sdk }}
+      - id: install
+        name: Install dependencies
+        run: dart pub get
+      - name: Generate Coverate
+        run: ./scripts/gen_coverage.sh
+        if: always() && steps.install.outcome == 'success'
+      - name: Archive code coverage results
+        uses: actions/upload-artifact@v2
+        with:
+          name: code-coverage-report
+          path: coverage_html

scripts/gen_coverage.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# This is supposed to run on the CI
+
+set -eux
+
+dart pub global activate coverage
+dart test --coverage="coverage"
+format_coverage --lcov --in=coverage --out=coverage.lcov --packages=.packages --report-on=lib
+
+sudo apt-get install -y lcov
+genhtml coverage.lcov -o coverage_html