Add artifact check for review info in workflow

Author: yash-learner

.github/workflows/test-review-handler.yml

@@ -44,24 +44,38 @@ jobs:
           echo "=== pull_requests array ==="
           echo "$PULL_REQUESTS"
 
+      - name: Check for review artifact
+        id: check-artifact
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          ARTIFACT_NAME=$(gh api "repos/${{ github.repository }}/actions/runs/${{ github.event.workflow_run.id }}/artifacts" \
+            --jq '.artifacts[] | select(.name == "review-info") | .name')
+          if [[ -n "$ARTIFACT_NAME" ]]; then
+            echo "exists=true" >> $GITHUB_OUTPUT
+            echo "review-info artifact found"
+          else
+            echo "exists=false" >> $GITHUB_OUTPUT
+            echo "No review-info artifact found — expected for non-changes_requested reviews"
+          fi
+
       - name: Download review info
-        id: download
+        if: steps.check-artifact.outputs.exists == 'true'
         uses: actions/download-artifact@v4
-        continue-on-error: true
         with:
           name: review-info
           github-token: ${{ secrets.GITHUB_TOKEN }}
           run-id: ${{ github.event.workflow_run.id }}
 
       - name: Log artifact contents
-        if: steps.download.outcome == 'success'
+        if: steps.check-artifact.outputs.exists == 'true'
         run: |
           echo "=== Artifact contents ==="
           echo "pr_number.txt: $(cat pr_number.txt)"
           echo "review_state.txt: $(cat review_state.txt)"
 
       - name: Read and validate review info
-        if: steps.download.outcome == 'success'
+        if: steps.check-artifact.outputs.exists == 'true'
         id: review
         run: |
           PR_NUMBER=$(cat pr_number.txt)
@@ -72,11 +86,17 @@ jobs:
             exit 1
           fi
 
+          if [[ "$REVIEW_STATE" != "changes_requested" && "$REVIEW_STATE" != "approved" && \
+                "$REVIEW_STATE" != "commented" && "$REVIEW_STATE" != "dismissed" ]]; then
+            echo "::error::Invalid review state: $REVIEW_STATE"
+            exit 1
+          fi
+
           echo "pr_number=$PR_NUMBER" >> $GITHUB_OUTPUT
           echo "review_state=$REVIEW_STATE" >> $GITHUB_OUTPUT
 
       - name: Comment on PR
-        if: steps.download.outcome == 'success'
+        if: steps.check-artifact.outputs.exists == 'true'
         uses: actions/github-script@v7
         env:
           PR_NUMBER: ${{ steps.review.outputs.pr_number }}