Add integration test for comments (not finished)

app/javascript/components/Comments/Comment.tsx

@@ -39,7 +39,7 @@ const Comment = ({
     </div>
     <p className="commentBody">{body}</p>
     <div className="commentFooter">
-      <a onClick={handleToggleCommentReply}>Reply</a>
+      <a className="commentReplyButton" onClick={handleToggleCommentReply}>Reply</a>
       <MutedText>{updatedAt}</MutedText>
     </div>
     {

app/javascript/components/Comments/NewComment.tsx

@@ -20,6 +20,7 @@ const NewComment = ({
     <textarea
       value={body}
       onChange={handleChange}
+      className="newCommentBody"
     />
     <Button onClick={() => handleSubmit(body, parentId)}>Submit</Button>
   </div>