Update previous links

backend/tests/test_api.py

@@ -415,6 +415,45 @@ def test_submit_link_stores_cleaned_url_and_public_feed():
     assert 'alice' in users_response.json()
 
 
+def test_duplicate_link_updates_comment_tags_and_retriggers_plugins():
+    headers = login_headers()
+    payload = {
+        'title': 'Duplicate candidate',
+        'url': 'https://example.com/duplicate?utm_source=campaign',
+        'comment': 'first comment',
+        'tags': ['#First'],
+    }
+    first = client.post('/api/links', headers=headers, json=payload)
+    assert first.status_code == 201
+
+    with patch('backend.app.api.links.plugin_manager.dispatch', return_value=[]) as dispatch:
+        duplicate = client.post('/api/links', headers=headers, json={
+            **payload,
+            'comment': 'updated comment',
+            'tags': ['#Second'],
+        })
+    assert duplicate.status_code == 200
+    assert duplicate.json()['duplicate'] is True
+    assert duplicate.json()['id'] == first.json()['id']
+    dispatch.assert_called_once()
+    assert dispatch.call_args.args[0]['comment'] == 'updated comment'
+    assert dispatch.call_args.args[0]['tags'] == ['#Second']
+    feed_item = next(item for item in client.get('/api/public/feed').json() if item['id'] == first.json()['id'])
+    assert feed_item['comment'] == 'updated comment'
+    assert feed_item['tags'] == ['#Second']
+
+
+def test_duplicate_link_check_is_authenticated_and_detects_existing_entry():
+    headers = login_headers()
+    payload = {'title': 'Check candidate', 'url': 'https://example.com/check-candidate'}
+    assert client.get('/api/links/check', params=payload).status_code == 401
+    created = client.post('/api/links', headers=headers, json=payload)
+    assert created.status_code == 201
+    check = client.get('/api/links/check', headers=headers, params=payload)
+    assert check.status_code == 200
+    assert check.json()['exists'] is True
+
+
 def test_links_support_tags_and_tag_filtering():
     headers = login_headers()
     response = client.post('/api/links', headers=headers, json={