Tests: added Python threading tests.

test/python/threads/asgi.py

@@ -0,0 +1,27 @@
+import asyncio
+import time
+import threading
+
+async def application(scope, receive, send):
+    assert scope['type'] == 'http'
+
+    headers = scope.get('headers', [])
+
+    def get_header(n, v=None):
+        for h in headers:
+            if h[0] == n:
+                return h[1]
+        return v
+
+    delay = float(get_header(b'x-delay', 0))
+
+    time.sleep(delay)
+
+    await send({
+        'type': 'http.response.start',
+        'status': 200,
+        'headers': [
+            (b'content-length', b'0'),
+            (b'x-thread', str(threading.currentThread().ident).encode()),
+        ]
+    })