Enable automatic browsing upvotes

tests/reddit-comment-client.test.ts

@@ -353,6 +353,19 @@ describe('RedditCommentClient.postComment', () => {
   });
 });
 
+describe('RedditCommentClient.upvote', () => {
+  it('submits the selected fullname through Reddit’s vote endpoint', async () => {
+    const transport = fakeTransport({ post: () => ({ status: 200, body: JSON.stringify({ json: { errors: [] } }) }) });
+    const client = new RedditCommentClient(transport, createMockLogger());
+
+    await expect(client.upvote('t1_comment')).resolves.toEqual({ status: 'submitted' });
+    expect(transport.posts[0]).toMatchObject({
+      url: 'https://old.reddit.com/api/vote',
+      form: { id: 't1_comment', dir: '1', api_type: 'json', uh: 'abc123' },
+    });
+  });
+});
+
 describe('RedditCommentClient.fetchCommentStates', () => {
   const logger = createMockLogger();