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diff --git a/test/misc_SUITE.erl b/test/misc_SUITE.erl
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+%% Copyright (c) 2017, Loïc Hoguin <[email protected]>
+%%
+%% Permission to use, copy, modify, and/or distribute this software for any
+%% purpose with or without fee is hereby granted, provided that the above
+%% copyright notice and this permission notice appear in all copies.
+%%
+%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+-module(misc_SUITE).
+-compile(export_all).
+
+-import(ct_helper, [config/2]).
+-import(ct_helper, [doc/1]).
+-import(cowboy_test, [gun_open/1]).
+
+all() ->
+	cowboy_test:common_all().
+
+groups() ->
+	cowboy_test:common_groups(ct_helper:all(?MODULE)).
+
+init_per_group(Name, Config) ->
+	cowboy_test:init_common_groups(Name, Config, ?MODULE).
+
+end_per_group(Name, _) ->
+	cowboy:stop_listener(Name).
+
+init_dispatch(_) ->
+	cowboy_router:compile([{"localhost", [
+		{"/", hello_h, []}
+	]}]).
+
+set_env(Config) ->
+	doc("Live replace a middleware environment value."),
+	ConnPid1 = gun_open(Config),
+	Ref1 = gun:get(ConnPid1, "/"),
+	{response, _, 200, _} = gun:await(ConnPid1, Ref1),
+	Listener = proplists:get_value(name, config(tc_group_properties, Config)),
+	cowboy:set_env(Listener, dispatch, []),
+	%% Only new connections get the updated environment.
+	ConnPid2 = gun_open(Config),
+	Ref2 = gun:get(ConnPid2, "/"),
+	{response, _, 400, _} = gun:await(ConnPid2, Ref2),
+	ok.