Update test command

.github/multiline-content.md

@@ -0,0 +1,5 @@
+This is a multi-line test comment read from a file.
+- With GitHub **Markdown** :sparkles:
+- Created by [create-or-update-comment][1]
+
+[1]: https://github.com/peter-evans/create-or-update-comment

.github/workflows/test-command.yml

@@ -60,6 +60,22 @@ jobs:
           comment-id: ${{ github.event.client_payload.github.payload.comment.id }}
           reactions: hooray
 
+      # Test create with body from file
+      - id: get-comment-body
+        run: |
+          body="$(cat .github/multiline-content.md)"
+          delimiter="$(openssl rand -hex 8)"
+          echo "body<<$delimiter" >> $GITHUB_OUTPUT
+          echo $body >> $GITHUB_OUTPUT
+          echo $delimiter >> $GITHUB_OUTPUT
+
+      - name: Create comment
+        uses: ./
+        with:
+          issue-number: 1
+          body: ${{ steps.get-comment-body.outputs.body }}
+
+      # Test create from template
       - name: Render template
         id: template
         uses: chuhlomin/render-template@v1.5