wait_for: add some integration tests (#25553)

test/integration/targets/wait_for/files/testserver.py

@@ -0,0 +1,16 @@
+import sys
+
+if __name__ == '__main__':
+    if sys.version_info[0] >= 3:
+        import http.server
+        import socketserver
+        PORT = int(sys.argv[1])
+        Handler = http.server.SimpleHTTPRequestHandler
+        httpd = socketserver.TCPServer(("", PORT), Handler)
+        httpd.serve_forever()
+    else:
+        import mimetypes
+        mimetypes.init()
+        mimetypes.add_type('application/json', '.json')
+        import SimpleHTTPServer
+        SimpleHTTPServer.test()