(ref) #26 adds coverage action

.github/workflows/test.yml

@@ -13,4 +13,25 @@ jobs:
         with:
           go-version: 1.17
       - name: Test
-        run: go test ./...
+        run: go test ./... -v
+  coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Setup go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.17
+      - name: Calc coverage
+        run: |
+          go test ./... -v -covermode=count -coverprofile=coverage.out
+      - name: Convert coverage.out to coverage.lcov
+        uses: jandelgado/gcov2lcov-action@v1
+      - name: Coveralls
+        uses: coverallsapp/github-action@v1.1.2
+        with:
+          github-token: ${{ secrets.github_token }}
+          path-to-lcov: coverage.lcov