Include asyncio task information in /-/threads debug page

tests/test_api.py

@@ -18,6 +18,7 @@ from .fixtures import (  # noqa
 )
 import json
 import pytest
+import sys
 import urllib
 
 
@@ -1229,6 +1230,14 @@ def test_metadata_json(app_client):
     assert METADATA == response.json
 
 
+def test_threads_json(app_client):
+    response = app_client.get("/-/threads.json")
+    expected_keys = {"threads", "num_threads"}
+    if sys.version_info >= (3, 7, 0):
+        expected_keys.update({"tasks", "num_tasks"})
+    assert expected_keys == set(response.json.keys())
+
+
 def test_plugins_json(app_client):
     response = app_client.get("/-/plugins.json")
     assert [