re-enable all CI tests

Also adds a condition such that a hardhat node is not started for parallel integration tests

.github/workflows/ci-reusable.yml

@@ -103,7 +103,7 @@ jobs:
           npm install
 
       - name: Run Ethereum node with Codex contracts
-        if: matrix.tests == 'contract' || matrix.tests == 'integration' || matrix.tests == 'tools' || matrix.tests == 'all'
+        if: matrix.tests == 'contract' || (matrix.tests == 'integration' && env.PARALLEL != 1) || matrix.tests == 'tools' || matrix.tests == 'all'
         working-directory: vendor/codex-contracts-eth
         env:
           MSYS2_PATH_TYPE: inherit

.github/workflows/ci.yml

@@ -56,3 +56,40 @@ jobs:
           options: "codex/ tests/"
           fail: true
           suggest: true
+
+  coverage:
+    # Force to stick to ubuntu 20.04 for coverage because
+    # lcov was updated to 2.x version in ubuntu-latest
+    # and cause a lot of issues.
+    # See https://github.com/linux-test-project/lcov/issues/238
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - name: Setup Nimbus Build System
+        uses: ./.github/actions/nimbus-build-system
+        with:
+          os: linux
+          nim_version: ${{ env.nim_version }}
+          coverage: true
+
+      - name: Generate coverage data
+        run: |
+          # make -j${ncpu} coverage
+          make -j${ncpu} coverage-script
+        shell: bash
+
+      - name: Upload coverage data to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          directory: ./coverage/
+          fail_ci_if_error: true
+          files: ./coverage/coverage.f.info
+          flags: unittests
+          name: codecov-umbrella
+          token: ${{ secrets.CODECOV_TOKEN }}
+          verbose: true