chore: add support for coverage reporting

.github/workflows/code-coverage.yml

@@ -0,0 +1,60 @@
+name: Generate code coverage badge
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    name: Update coverage badge
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          persist-credentials: false # otherwise, the token used is the GITHUB_TOKEN, instead of your personal access token.
+          fetch-depth: 0 # otherwise, there would be errors pushing refs to the destination repository.
+
+      - name: Setup go
+        uses: actions/setup-go@v2
+        with:
+          go-version: '1.14.4'
+
+      - uses: actions/cache@v2
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
+      - name: Run Test
+        run: |
+          go test -v ./... -covermode=count -coverprofile=coverage.out
+          go tool cover -func=coverage.out -o=coverage.out
+
+      - name: Go Coverage Badge  # Pass the `coverage.out` output to this action
+        uses: tj-actions/coverage-badge-go@v2
+        with:
+          filename: coverage.out
+
+      - name: Verify Changed files
+        uses: tj-actions/verify-changed-files@v12
+        id: verify-changed-files
+        with:
+          files: README.md
+
+      - name: Commit changes
+        if: steps.verify-changed-files.outputs.files_changed == 'true'
+        run: |
+          git config --local user.email "action@github.com"
+          git config --local user.name "GitHub Action"
+          git add README.md
+          git commit -m "chore: Updated coverage badge."
+
+      - name: Push changes
+        if: steps.verify-changed-files.outputs.files_changed == 'true'
+        uses: ad-m/github-push-action@master
+        with:
+          github_token: ${{ github.token }}
+          branch: ${{ github.head_ref }}

README.md

@@ -1,4 +1,5 @@
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/bb5dc10c1d2645c0894fa6774300639b)](https://app.codacy.com/gh/tj-actions/auto-doc?utm_source=github.com\&utm_medium=referral\&utm_content=tj-actions/auto-doc\&utm_campaign=Badge_Grade_Settings)
+![Coverage](https://img.shields.io/badge/Coverage-84.1%25-brightgreen)
 [![Go Reference](https://pkg.go.dev/badge/github.com/tj-actions/auto-doc.svg)](https://pkg.go.dev/github.com/tj-actions/auto-doc)
 [![Go Report Card](https://goreportcard.com/badge/github.com/tj-actions/auto-doc)](https://goreportcard.com/report/github.com/tj-actions/auto-doc)
 [![CI](https://github.com/tj-actions/auto-doc/workflows/CI/badge.svg)](https://github.com/tj-actions/auto-doc/actions?query=workflow%3ACI)