Improve keepalive_timeout test to capture the bug
diff --git a/test/core/end2end/tests/keepalive_timeout.cc b/test/core/end2end/tests/keepalive_timeout.cc
index f0dd061..c0771b8 100644
--- a/test/core/end2end/tests/keepalive_timeout.cc
+++ b/test/core/end2end/tests/keepalive_timeout.cc
@@ -102,7 +102,7 @@
   grpc_arg keepalive_arg_elems[3];
   keepalive_arg_elems[0].type = GRPC_ARG_INTEGER;
   keepalive_arg_elems[0].key = const_cast<char*>(GRPC_ARG_KEEPALIVE_TIME_MS);
-  keepalive_arg_elems[0].value.integer = 1500;
+  keepalive_arg_elems[0].value.integer = 3500;
   keepalive_arg_elems[1].type = GRPC_ARG_INTEGER;
   keepalive_arg_elems[1].key = const_cast<char*>(GRPC_ARG_KEEPALIVE_TIMEOUT_MS);
   keepalive_arg_elems[1].value.integer = 0;