[PATCH] test: rework box/misc test part regarding on_shutdown triggers

[Vladimir Davydov]

On Thu, Apr 11, 2019 at 04:37:20PM +0300, Serge Petrenko wrote:
> Rewrite the test so that it doesn't depend on timeouts, which can be
> exceeded under high load, too much and simplify it a little.
> 
> Also extract the whole part regarding on_shutdown triggers into a
> separate test, so that its sporadic failures would be easier to
> investigate.
> 
> Part of #4134
> ---
> https://github.com/tarantool/tarantool/issues/4134
> https://github.com/tarantool/tarantool/tree/sp/gh-4134-fix-on-shutdown-tests
> 
>  test/box/misc.result                   | 161 -------------------------
>  test/box/misc.test.lua                 |  62 ----------
>  test/box/on_shutdown_triggers.result   | 160 ++++++++++++++++++++++++
>  test/box/on_shutdown_triggers.test.lua |  62 ++++++++++

Better call simply box/on_shutdown.test.lua.

Anyway, this patch is impossible to review. Please split it in two - one
moves the test case to a separate file, another - fixes it.

I managed to extract the diff. Pasting it here for review.

> @@ -33,7 +33,7 @@
>  box.space.shutdown:select{}
>  box.space.shutdown:drop()
>  
> --- Check that os.exit invokes triggers
> +-- Check that os.exit invokes on_shutdown triggers
>  fiber = require("fiber")
>  test_run:cmd("create server test with script='box/proxy.lua'")
>  test_run:cmd("start server test")
> @@ -46,19 +46,17 @@
>  _ = box.ctl.on_shutdown(function() print("on_shutdown 5") end)
>  -- Check that we don't hang infinitely after os.exit()
>  -- even if the following code doesn't yield.
> -fiber = require("fiber")
> -_ = fiber.create(function() fiber.sleep(0.05) os.exit() while true do end end)
> +fiber = require('fiber')

This 'require' isn't needed anymore, no?

>  test_run:cmd("switch default")
> +test_run:eval("test", "_ = fiber.new(function() os.exit() while true do end end)")

This is supposed to stop the default instance?!

>  fiber.sleep(0.1)
>  -- The server should be already stopped by os.exit(),
>  -- but start doesn't work without a prior call to stop.
>  test_run:cmd("stop server test")
>  test_run:cmd("start server test")
> -test_run:cmd("switch test")
> -test_run:grep_log('test', 'on_shutdown 5', nil, {noreset=true})
> +test_run:wait_log('test', 'on_shutdown 5', nil, 5, {noreset=true})
>  -- make sure we exited because of os.exit(), not a signal.
>  test_run:grep_log('test', 'signal', nil, {noreset=true})
> -test_run:cmd("switch default")
>  test_run:cmd("stop server test")
>  test_run:cmd("cleanup server test")
>  test_run:cmd("delete server test")