Initial havoc test suite

Makefile

@@ -16,8 +16,9 @@ LOCAL_DEPS = ssl
 
 DOC_DEPS = asciideck
 
-TEST_DEPS = $(if $(CI_ERLANG_MK),ci.erlang.mk) ct_helper
+TEST_DEPS = $(if $(CI_ERLANG_MK),ci.erlang.mk) ct_helper havoc
 dep_ct_helper = git https://github.com/ninenines/ct_helper master
+dep_havoc = git https://github.com/ankhers/havoc master
 
 # CI configuration.
 
@@ -33,6 +34,12 @@ AUTO_CI_WINDOWS ?= OTP-19+
 
 include erlang.mk
 
+# Don't run the havoc test suite by default.
+
+ifndef FULL
+CT_SUITES := $(filter-out havoc,$(CT_SUITES))
+endif
+
 # Compile options.
 
 TEST_ERLC_OPTS += +'{parse_transform, eunit_autoexport}'

test/havoc_SUITE.erl

@@ -0,0 +1,66 @@
+%% Copyright (c) 2019, Loïc Hoguin <essen@ninenines.eu>
+%%
+%% 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(havoc_SUITE).
+-compile(export_all).
+-compile(nowarn_export_all).
+
+-import(ct_helper, [doc/1]).
+-import(ct_helper, [name/0]).
+
+%% ct.
+
+all() ->
+	ct_helper:all(?MODULE).
+
+init_per_suite(Config) ->
+	{ok, _} = application:ensure_all_started(ranch),
+	ok = application:start(havoc),
+	%% Comment to hide progress reports in the terminal.
+	application:set_env(kernel, logger_sasl_compatible, true),
+	ok = application:start(sasl),
+	%% Enable logging of progress reports.
+	%% They will only be available in the HTML reports by default.
+	ok = logger:set_primary_config(level, info),
+	Config.
+
+end_per_suite(_) ->
+	ok = application:stop(sasl),
+	ok = application:stop(havoc),
+	ok = application:stop(ranch).
+
+%% Tests.
+
+havoc_tcp(_) ->
+	doc("Start a TCP listener, establish a hundred connections, "
+		"run havoc, confirm we can still connect."),
+	%% Start a TCP listener.
+	Name = name(),
+	{ok, _} = ranch:start_listener(Name,
+		ranch_tcp, #{},
+		echo_protocol, []),
+	Port = ranch:get_port(Name),
+	%% Establish a hundred connections.
+	_ = [begin
+		{ok, Socket} = gen_tcp:connect("localhost", Port, [{active, false}]),
+		Socket
+	end || _ <- lists:seq(1, 100)],
+	%% Run Havoc.
+	havoc:on([{applications, [ranch]}]),
+	timer:sleep(60000),
+	havoc:off(),
+	timer:sleep(1000),
+	%% Confirm we can still connect.
+	{ok, _} = gen_tcp:connect("localhost", Port, [{active, false}]),
+	ok = ranch:stop_listener(Name).