Hi Sergey, thank you for the patch, LGTM.

  
>Среда, 8 апреля 2020, 18:43 +03:00 от Sergey Bronnikov <estetus@gmail.com>:
> 
>From: Sergey Bronnikov < sergeyb@tarantool.org >
>
>Closes #4681
>---
> test/app-tap/console.test.lua | 4 ---
> test/app-tap/csv.test.lua | 28 ++++++++--------
> test/box-py/box.lua | 2 +-
> test/box-tap/gc.test.lua | 4 +--
> test/box/box.lua | 2 +-
> test/box/hash_multipart.result | 2 +-
> test/box/hash_multipart.test.lua | 2 +-
> test/box/iproto_stress.result | 8 ++---
> test/box/iproto_stress.test.lua | 4 +--
> test/box/lua/cfg_bad_vinyl_dir.lua | 2 +-
> test/box/lua/cfg_rtree.lua | 2 +-
> test/box/lua/cfg_test1.lua | 2 +-
> test/box/lua/cfg_test2.lua | 2 +-
> test/box/lua/cfg_test3.lua | 2 +-
> test/box/lua/cfg_test4.lua | 2 +-
> test/box/lua/cfg_test5.lua | 4 +--
> test/box/lua/cfg_test6.lua | 2 +-
> test/box/lua/utils.lua | 3 +-
> test/box/on_schema_init.lua | 2 +-
> test/box/proxy.lua | 2 +-
> test/box/tiny.lua | 2 +-
> test/box/tree_pk.result | 6 ++--
> test/box/tree_pk.test.lua | 6 ++--
> test/engine/tree_min_max_count.result | 2 +-
> test/engine/tree_min_max_count.test.lua | 2 +-
> test/replication-py/master.lua | 2 +-
> test/replication-py/panic.lua | 2 +-
> test/replication/master.lua | 2 +-
> test/replication/replicaset_ro_mostly.result | 2 +-
> .../replication/replicaset_ro_mostly.test.lua | 2 +-
> test/sql-tap/analyze3.test.lua | 6 ++--
> test/sql-tap/analyze9.test.lua | 16 ++++-----
> .../gh-4077-iproto-execute-no-bind.test.lua | 7 ++--
> test/sql-tap/index1.test.lua | 1 -
> test/sql-tap/join3.test.lua | 2 +-
> test/sql-tap/select9.test.lua | 10 ++----
> test/sql-tap/tkt-fa7bf5ec.test.lua | 6 ++--
> test/sql-tap/where2.test.lua | 2 +-
> test/sql/lua/sql_tokenizer.lua | 2 +-
> test/sql/savepoints.result | 6 ++--
> test/sql/savepoints.test.lua | 6 ++--
> test/sql/triggers.result | 2 +-
> test/sql/triggers.test.lua | 2 +-
> test/vinyl/large.lua | 4 +--
> test/vinyl/stat.result | 33 ++++++++++++-------
> test/vinyl/stat.test.lua | 22 ++++++-------
> test/vinyl/txn_proxy.lua | 6 ++--
> test/vinyl/vinyl.lua | 2 +-
> test/wal_off/rtree_benchmark.result | 2 +-
> test/wal_off/rtree_benchmark.test.lua | 2 +-
> test/xlog-py/box.lua | 2 +-
> test/xlog/big_tx.result | 2 +-
> test/xlog/big_tx.test.lua | 2 +-
> test/xlog/checkpoint_daemon.result | 4 +--
> test/xlog/checkpoint_daemon.test.lua | 4 +--
> test/xlog/panic.lua | 2 +-
> test/xlog/panic_on_wal_error.result | 2 +-
> test/xlog/panic_on_wal_error.test.lua | 2 +-
> test/xlog/reader.result | 2 +-
> test/xlog/reader.test.lua | 2 +-
> test/xlog/snap_io_rate.test.lua | 2 +-
> test/xlog/transaction.result | 18 +++++-----
> test/xlog/transaction.test.lua | 18 +++++-----
> test/xlog/xlog.lua | 2 +-
> 64 files changed, 157 insertions(+), 155 deletions(-)
>
>diff --git a/test/app-tap/console.test.lua b/test/app-tap/console.test.lua
>index da5c1e71e..737450387 100755
>--- a/test/app-tap/console.test.lua
>+++ b/test/app-tap/console.test.lua
>@@ -5,7 +5,6 @@ local console = require('console')
> local socket = require('socket')
> local yaml = require('yaml')
> local fiber = require('fiber')
>-local ffi = require('ffi')
> local log = require('log')
> local fio = require('fio')
> 
>@@ -59,12 +58,9 @@ test:is(#client:read(EOL) > 0, true, "_G")
> client:write("require('fiber').id()\n")
> local fid1 = yaml.decode(client:read(EOL))[1]
> local state = fiber.find(fid1).storage.console
>-local server_info = state.client:peer()
> local client_info = state.client:name()
> test:is(client_info.host, client_info.host, "state.socker:peer().host")
> test:is(client_info.port, client_info.port, "state.socker:peer().port")
>-server_info = nil
>-client_info = nil
> 
> -- Check console.delimiter()
> client:write("require('console').delimiter(';')\n")
>diff --git a/test/app-tap/csv.test.lua b/test/app-tap/csv.test.lua
>index a7f17b1ea..689db7997 100755
>--- a/test/app-tap/csv.test.lua
>+++ b/test/app-tap/csv.test.lua
>@@ -2,9 +2,9 @@
> 
> local function table2str(t)
>     local res = ""
>- for k, line in pairs(t) do
>+ for _, line in pairs(t) do
>         local s = ""
>- for k2, field in pairs(line) do
>+ for _, field in pairs(line) do
>             s = s .. '|' .. field .. '|\t'
>         end
>         res = res .. s .. '\n'
>@@ -12,9 +12,9 @@ local function table2str(t)
>     return res
> end
> 
>-local function myread(self, bytes)
>+local function myread(self, bytes)
>     self.i = self.i + bytes
>- return self.v:sub(self.i - bytes + 1, self.i)
>+ return self.v:sub(self.i - bytes + 1, self.i)
> end
> local csv = require('csv')
> local fio = require('fio')
>@@ -27,10 +27,10 @@ local test4_ans = '|123|\t|5|\t|92|\t|0|\t|0|\t\n|1|\t|12 34|\t|56|\t' ..
> local test5_ans = "|1|\t\n|23|\t|456|\t|abcac|\t|'multiword field 4'|\t\n" ..
>                   "|none|\t|none|\t|0|\t\n||\t||\t||\t\n|aba|\t|adda|\t|f" ..
>                   "3|\t|0|\t\n|local res = internal.pwrite(self.fh|\t|dat" ..
>- "a|\t|len|\t|offset)|\t\n|iflag = bit.bor(iflag|\t|fio." ..
>+ "a|\t|len|\t|offset)|\t\n|iflag = bit.bor(iflag|\t|fio." ..
>                   "c.flag[ flag ])|\t\n||\t||\t||\t\n"
> local test6_ans = "|23|\t|456|\t|abcac|\t|'multiword field 4'|\t\n|none|" ..
>- "\t|none|\t|0|\t\n||\t||\t||\t\n|aba|\t|adda|\t|f3|\t|" ..
>+ "\t|none|\t|0|\t\n||\t||\t||\t\n|aba|\t|adda|\t|f3|\t|" ..
>                   "0|\t\n|local res = internal.pwrite(self.fh|\t|data|\t" ..
>                   "|len|\t|offset)|\t\n|iflag = bit.bor(iflag|\t|fio.c.f" ..
>                   "lag[ flag ])|\t\n||\t||\t||\t\n"
>@@ -62,7 +62,7 @@ local f = fio.open(file1, { 'O_WRONLY', 'O_TRUNC', 'O_CREAT' }, tonumber('0777',
> f:write("123 , 5 , 92 , 0, 0\n" ..
>         "1, 12 34, 56, \"quote , \", 66\nok")
> f:close()
>-f = fio.open(file1, {'O_RDONLY'})
>+f = fio.open(file1, {'O_RDONLY'})
> test:is(table2str(csv.load(f, {chunk_size = 10})), test4_ans, "fio test1")
> f:close()
> 
>@@ -77,20 +77,20 @@ f:write("1\n23,456,abcac,\'multiword field 4\'\n" ..
>         ",,"
> )
> f:close()
>-f = fio.open(file2, {'O_RDONLY'})
>+f = fio.open(file2, {'O_RDONLY'})
> --symbol by symbol reading
>-test:is(table2str(csv.load(f, {chunk_size = 1})), test5_ans, "fio test2")
>+test:is(table2str(csv.load(f, {chunk_size = 1})), test5_ans, "fio test2")
> f:close()
> 
>-f = fio.open(file2, {'O_RDONLY'})
>+f = fio.open(file2, {'O_RDONLY'})
> opts = {chunk_size = 7, skip_head_lines = 1}
> --7 symbols per chunk
>-test:is(table2str(csv.load(f, opts)), test6_ans, "fio test3")
>+test:is(table2str(csv.load(f, opts)), test6_ans, "fio test3")
> f:close()
> 
> t = {
>- {'quote" d', ',and, comma', 'both " of " t,h,e,m'},
>- {'"""', ',","'},
>+ {'quote" d', ',and, comma', 'both " of " t,h,e,m'},
>+ {'"""', ',","'},
>     {'mul\nti\nli\r\nne\n\n', 'field'},
>     {""},
>     {'"'},
>@@ -100,7 +100,7 @@ t = {
> f = require("fio").open(file3, { "O_WRONLY", "O_TRUNC" , "O_CREAT"}, 0x1FF)
> csv.dump(t, {}, f)
> f:close()
>-f = fio.open(file3, {'O_RDONLY'})
>+f = fio.open(file3, {'O_RDONLY'})
> t2 = csv.load(f, {chunk_size = 5})
> f:close()
> 
>diff --git a/test/box-py/box.lua b/test/box-py/box.lua
>index e9403774c..35a087de9 100644
>--- a/test/box-py/box.lua
>+++ b/test/box-py/box.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> 
> box.cfg{
>     listen = os.getenv("LISTEN"),
>diff --git a/test/box-tap/gc.test.lua b/test/box-tap/gc.test.lua
>index f88752e71..f0155779c 100755
>--- a/test/box-tap/gc.test.lua
>+++ b/test/box-tap/gc.test.lua
>@@ -4,7 +4,7 @@ local fiber = require('fiber')
> 
> box.cfg{}
> 
>-local debug = type(box.error.injection) == "table"
>+local debug = type(box.error.injection) == "table"
> 
> -- check box.info.gc() is false if snapshot is not in progress
> local test = tap.test('box.info.gc')
>@@ -19,7 +19,7 @@ test:is(gc.checkpoint_is_in_progress, false, "checkpoint is not in progress")
> if debug then
>     box.error.injection.set("ERRINJ_SNAP_COMMIT_DELAY", true)
>     local snapshot_f = function()
>- box.snapshot()
>+ box.snapshot()
>     end
>     fiber.create(snapshot_f)
>     local gc = box.info.gc()
>diff --git a/test/box/box.lua b/test/box/box.lua
>index 6fad07015..2cf399f96 100644
>--- a/test/box/box.lua
>+++ b/test/box/box.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> 
> local msgpack = require('msgpack')
> 
>diff --git a/test/box/hash_multipart.result b/test/box/hash_multipart.result
>index e94313b62..e6915652f 100644
>--- a/test/box/hash_multipart.result
>+++ b/test/box/hash_multipart.result
>@@ -62,7 +62,7 @@ test_run:cmd("setopt delimiter ';'")
> function select_all()
>     local result = {}
>     local tuple, v
>- for tuple, v in hash:pairs() do
>+ for _, v in hash:pairs() do
>         table.insert(result, v)
>     end
>     return result
>diff --git a/test/box/hash_multipart.test.lua b/test/box/hash_multipart.test.lua
>index c0a871bee..c572d13b6 100644
>--- a/test/box/hash_multipart.test.lua
>+++ b/test/box/hash_multipart.test.lua
>@@ -24,7 +24,7 @@ test_run:cmd("setopt delimiter ';'")
> function select_all()
>     local result = {}
>     local tuple, v
>- for tuple, v in hash:pairs() do
>+ for _, v in hash:pairs() do
>         table.insert(result, v)
>     end
>     return result
>diff --git a/test/box/iproto_stress.result b/test/box/iproto_stress.result
>index 7149d6c52..3b5b0a031 100644
>--- a/test/box/iproto_stress.result
>+++ b/test/box/iproto_stress.result
>@@ -76,13 +76,13 @@ test_run:wait_cond(function() return n_workers == 0 end, 60)
> ---
> - true
> ...
>-n_workers -- 0
>+assert(n_workers == 0)
> ---
>-- 0
>+- true
> ...
>-n_errors -- 0
>+assert(n_errors == 0)
> ---
>-- 0
>+- true
> ...
> box.schema.user.revoke('guest', 'read,write,execute', 'universe')
> ---
>diff --git a/test/box/iproto_stress.test.lua b/test/box/iproto_stress.test.lua
>index 1e1a6578b..68d1f56fd 100644
>--- a/test/box/iproto_stress.test.lua
>+++ b/test/box/iproto_stress.test.lua
>@@ -42,8 +42,8 @@ fiber.sleep(0.1)
> box.error.injection.set("ERRINJ_WAL_DELAY", false)
> 
> test_run:wait_cond(function() return n_workers == 0 end, 60)
>-n_workers -- 0
>-n_errors -- 0
>+assert(n_workers == 0)
>+assert(n_errors == 0)
> 
> box.schema.user.revoke('guest', 'read,write,execute', 'universe')
> s:drop()
>diff --git a/test/box/lua/cfg_bad_vinyl_dir.lua b/test/box/lua/cfg_bad_vinyl_dir.lua
>index 8e1a98dc8..82746b99a 100644
>--- a/test/box/lua/cfg_bad_vinyl_dir.lua
>+++ b/test/box/lua/cfg_bad_vinyl_dir.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> 
> box.cfg{
>     listen = os.getenv("LISTEN"),
>diff --git a/test/box/lua/cfg_rtree.lua b/test/box/lua/cfg_rtree.lua
>index f2d32ef7d..860cb14a8 100644
>--- a/test/box/lua/cfg_rtree.lua
>+++ b/test/box/lua/cfg_rtree.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> box.error.injection.set("ERRINJ_INDEX_RESERVE", true)
> box.cfg{
>     listen = os.getenv("LISTEN"),
>diff --git a/test/box/lua/cfg_test1.lua b/test/box/lua/cfg_test1.lua
>index 60b7aff9a..aa026ed42 100644
>--- a/test/box/lua/cfg_test1.lua
>+++ b/test/box/lua/cfg_test1.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> 
> box.cfg{
>     listen = os.getenv("LISTEN"),
>diff --git a/test/box/lua/cfg_test2.lua b/test/box/lua/cfg_test2.lua
>index 2397f9c19..536661698 100644
>--- a/test/box/lua/cfg_test2.lua
>+++ b/test/box/lua/cfg_test2.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> 
> box.cfg{
>     listen = os.getenv("LISTEN"),
>diff --git a/test/box/lua/cfg_test3.lua b/test/box/lua/cfg_test3.lua
>index 6a6e544b6..4978900fb 100644
>--- a/test/box/lua/cfg_test3.lua
>+++ b/test/box/lua/cfg_test3.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> 
> box.cfg{
>     listen = os.getenv("LISTEN"),
>diff --git a/test/box/lua/cfg_test4.lua b/test/box/lua/cfg_test4.lua
>index 82dab8757..21a38f95c 100644
>--- a/test/box/lua/cfg_test4.lua
>+++ b/test/box/lua/cfg_test4.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> 
> box.cfg{
>     listen = os.getenv("LISTEN"),
>diff --git a/test/box/lua/cfg_test5.lua b/test/box/lua/cfg_test5.lua
>index e3eb87392..8b6f9b31c 100644
>--- a/test/box/lua/cfg_test5.lua
>+++ b/test/box/lua/cfg_test5.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> 
> box.cfg{
>     listen = os.getenv("LISTEN"),
>@@ -7,4 +7,4 @@ box.cfg{
> }
> 
> require('console').listen(os.getenv('ADMIN'))
>-box.schema.user.grant('guest', 'read,write,execute', 'universe')
>\ No newline at end of file
>+box.schema.user.grant('guest', 'read,write,execute', 'universe')
>diff --git a/test/box/lua/cfg_test6.lua b/test/box/lua/cfg_test6.lua
>index efcfc6f3e..0a5859bc5 100644
>--- a/test/box/lua/cfg_test6.lua
>+++ b/test/box/lua/cfg_test6.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> 
> box.cfg{
>     listen = os.getenv("LISTEN"),
>diff --git a/test/box/lua/utils.lua b/test/box/lua/utils.lua
>index 5f859fd19..058c4a471 100644
>--- a/test/box/lua/utils.lua
>+++ b/test/box/lua/utils.lua
>@@ -212,10 +212,9 @@ function create_iterator(obj, key, opts)
>         return tp
>     end
>     res.iterate_over = function()
>- local tp = nil
>         local ret = {}
>         local i = 0
>- tp = res.next()
>+ local tp = res.next()
>         while tp do
>             ret[i] = tp
>             i = i + 1
>diff --git a/test/box/on_schema_init.lua b/test/box/on_schema_init.lua
>index 17cf89166..f74d6d7fe 100644
>--- a/test/box/on_schema_init.lua
>+++ b/test/box/on_schema_init.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> 
> function test_before_replace_trig(old, new)
>     -- return multiple values so that the stack fills earlier.
>diff --git a/test/box/proxy.lua b/test/box/proxy.lua
>index 8bbd505f8..c763e9634 100644
>--- a/test/box/proxy.lua
>+++ b/test/box/proxy.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> 
> box.cfg{
>     listen = os.getenv("LISTEN"),
>diff --git a/test/box/tiny.lua b/test/box/tiny.lua
>index 04b523fb2..608d48366 100644
>--- a/test/box/tiny.lua
>+++ b/test/box/tiny.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> 
> box.cfg{
>     listen = os.getenv("LISTEN"),
>diff --git a/test/box/tree_pk.result b/test/box/tree_pk.result
>index df3c78bed..4489d8cd9 100644
>--- a/test/box/tree_pk.result
>+++ b/test/box/tree_pk.result
>@@ -27,7 +27,7 @@ box.snapshot()
> ---
> - ok
> ...
>-i0:bsize() > bsize
>+assert(i0:bsize() > bsize)
> ---
> - true
> ...
>@@ -153,8 +153,8 @@ test_run:cmd("setopt delimiter ';'")
> ...
> function crossjoin(space0, space1, limit)
>     local result = {}
>- for state, v0 in space0:pairs() do
>- for state, v1 in space1:pairs() do
>+ for _, v0 in space0:pairs() do
>+ for _, v1 in space1:pairs() do
>             if limit <= 0 then
>                 return result
>             end
>diff --git a/test/box/tree_pk.test.lua b/test/box/tree_pk.test.lua
>index 1190ab424..bc3784a98 100644
>--- a/test/box/tree_pk.test.lua
>+++ b/test/box/tree_pk.test.lua
>@@ -11,7 +11,7 @@ box.snapshot()
> s0:insert{2, 'tuple 2'}
> box.snapshot()
> 
>-i0:bsize() > bsize
>+assert(i0:bsize() > bsize)
> 
> s0:insert{3, 'tuple 3'}
> s0.index['primary']:get{1}
>@@ -58,8 +58,8 @@ test_run = env.new()
> test_run:cmd("setopt delimiter ';'")
> function crossjoin(space0, space1, limit)
>     local result = {}
>- for state, v0 in space0:pairs() do
>- for state, v1 in space1:pairs() do
>+ for _, v0 in space0:pairs() do
>+ for _, v1 in space1:pairs() do
>             if limit <= 0 then
>                 return result
>             end
>diff --git a/test/engine/tree_min_max_count.result b/test/engine/tree_min_max_count.result
>index f55732aa6..9f1595a20 100644
>--- a/test/engine/tree_min_max_count.result
>+++ b/test/engine/tree_min_max_count.result
>@@ -1189,7 +1189,7 @@ space6:drop()
> ---
> ...
> -- min max count after many inserts
>-string = require('string')
>+local string = require('string')
> ---
> ...
> space7 = box.schema.space.create('space7', { engine = engine })
>diff --git a/test/engine/tree_min_max_count.test.lua b/test/engine/tree_min_max_count.test.lua
>index 0633c56b3..19b5fe92d 100644
>--- a/test/engine/tree_min_max_count.test.lua
>+++ b/test/engine/tree_min_max_count.test.lua
>@@ -337,7 +337,7 @@ space6:drop()
> 
> -- min max count after many inserts
> 
>-string = require('string')
>+local string = require('string')
> 
> space7 = box.schema.space.create('space7', { engine = engine })
> index7 = space7:create_index('primary', { type = 'tree', parts = {1, 'scalar'} })
>diff --git a/test/replication-py/master.lua b/test/replication-py/master.lua
>index e924b5495..b43bafd54 100644
>--- a/test/replication-py/master.lua
>+++ b/test/replication-py/master.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> box.cfg({
>     listen = os.getenv("LISTEN"),
>     memtx_memory = 107374182,
>diff --git a/test/replication-py/panic.lua b/test/replication-py/panic.lua
>index 75a738cbb..e72d11419 100644
>--- a/test/replication-py/panic.lua
>+++ b/test/replication-py/panic.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> box.cfg({
>     listen = os.getenv("LISTEN"),
>     memtx_memory = 107374182,
>diff --git a/test/replication/master.lua b/test/replication/master.lua
>index e924b5495..b43bafd54 100644
>--- a/test/replication/master.lua
>+++ b/test/replication/master.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> box.cfg({
>     listen = os.getenv("LISTEN"),
>     memtx_memory = 107374182,
>diff --git a/test/replication/replicaset_ro_mostly.result b/test/replication/replicaset_ro_mostly.result
>index a471779d3..e509e0da0 100644
>--- a/test/replication/replicaset_ro_mostly.result
>+++ b/test/replication/replicaset_ro_mostly.result
>@@ -35,7 +35,7 @@ test_run:cmd("setopt delimiter ';'")
> - true
> ...
> function create_cluster_uuid(servers, uuids)
>- for i, name in ipairs(servers) do
>+ for _, name in ipairs(servers) do
>         test_run:cmd(create_cluster_cmd1:format(name, name))
>     end
>     for i, name in ipairs(servers) do
>diff --git a/test/replication/replicaset_ro_mostly.test.lua b/test/replication/replicaset_ro_mostly.test.lua
>index 19cd1fe4a..e06e29c8e 100644
>--- a/test/replication/replicaset_ro_mostly.test.lua
>+++ b/test/replication/replicaset_ro_mostly.test.lua
>@@ -16,7 +16,7 @@ create_cluster_cmd2 = 'start server %s with args="%s", wait_load=False, wait=Fal
> 
> test_run:cmd("setopt delimiter ';'")
> function create_cluster_uuid(servers, uuids)
>- for i, name in ipairs(servers) do
>+ for _, name in ipairs(servers) do
>         test_run:cmd(create_cluster_cmd1:format(name, name))
>     end
>     for i, name in ipairs(servers) do
>diff --git a/test/sql-tap/analyze3.test.lua b/test/sql-tap/analyze3.test.lua
>index dcbea1da5..5c9c28601 100755
>--- a/test/sql-tap/analyze3.test.lua
>+++ b/test/sql-tap/analyze3.test.lua
>@@ -23,15 +23,15 @@ testprefix = "analyze3"
> ------------------------------------------------------------------------
> -- Test Organization:
> --
>--- analyze3-1.*: Test that the values of bound parameters are considered
>+-- analyze3-1.*: Test that the values of bound parameters are considered
> -- in the same way as constants when planning queries that
> -- use range constraints.
> --
>--- analyze3-2.*: Test that the values of bound parameters are considered
>+-- analyze3-2.*: Test that the values of bound parameters are considered
> -- in the same way as constants when planning queries that
> -- use LIKE expressions in the WHERE clause.
> --
>--- analyze3-3.*: Test that binding to a variable does not invalidate the
>+-- analyze3-3.*: Test that binding to a variable does not invalidate the
> -- query plan when there is no way in which replanning the
> -- query may produce a superior outcome.
> --
>diff --git a/test/sql-tap/analyze9.test.lua b/test/sql-tap/analyze9.test.lua
>index 02eb49f69..7412ba5fe 100755
>--- a/test/sql-tap/analyze9.test.lua
>+++ b/test/sql-tap/analyze9.test.lua
>@@ -609,7 +609,7 @@ test:do_execsql_test(
> test:do_test(
>     "10.1.2",
>     function()
>- local a = 0
>+ local a
>         for i = 1, 100 do
>             if i > 90 then
>                 a = i
>@@ -657,7 +657,7 @@ test:do_execsql_test(
> test:do_test(
>     "10.2.2",
>     function()
>- local a = 0
>+ local a
>         for i = 1, 100 do
>             if i > 90 then
>                 a = i
>@@ -711,7 +711,7 @@ test:do_execsql_test(
> test:do_test(
>     11.1,
>     function()
>- local a = 0
>+ local a
>         for i = 0, 100 do
>             if i % 10 == 0 then
>                 a = "\"ABC\""
>@@ -762,7 +762,7 @@ test:do_execsql_test(
> test:do_test(
>     11.5,
>     function()
>- local a = 0
>+ local a
>         for i = 0, 100 do
>             if i % 10 == 0 then
>                 a = "\"ABC\""
>@@ -823,7 +823,7 @@ test:do_execsql_test(
> test:do_test(
>     12.1,
>     function()
>- local a = 0
>+ local a
>         for i = 0, 100 do
>             if i % 10 == 0 then
>                 a = "\"ABC\""
>@@ -874,7 +874,7 @@ test:do_execsql_test(
> test:do_test(
>     12.5,
>     function()
>- local a = 0
>+ local a
>         for i = 0, 100 do
>             if i % 10 == 0 then
>                 a = "\"ABC\""
>@@ -931,7 +931,7 @@ test:do_test(
>         test:execsql("CREATE TABLE t1(id INTEGER PRIMARY KEY AUTOINCREMENT, a TEXT, b INT, c INT, d INT);")
>         test:execsql("CREATE INDEX i1 ON t1(a);")
>         test:execsql("CREATE INDEX i2 ON t1(b, c);")
>- local a = 0
>+ local a
>         for i = 0, 100 do
>             if i % 2 == 1 then
>                 a = "\"abc\""
>@@ -1161,7 +1161,7 @@ test:do_test(
>             INSERT INTO t1 SELECT null, 2*a,2*b,2*c,d FROM t1;
>             INSERT INTO t1 SELECT null, 2*a,2*b,2*c,d FROM t1;
>         ]])
>- local b = 0
>+ local b
>         for i = 0, 31 do
>             if (i < 8) then
>                 b = 0
>diff --git a/test/sql-tap/gh-4077-iproto-execute-no-bind.test.lua b/test/sql-tap/gh-4077-iproto-execute-no-bind.test.lua
>index d4b597e35..2f71a68ea 100755
>--- a/test/sql-tap/gh-4077-iproto-execute-no-bind.test.lua
>+++ b/test/sql-tap/gh-4077-iproto-execute-no-bind.test.lua
>@@ -41,10 +41,11 @@ local size = msgpack.encode(header:len() + body:len())
> sock:write(size .. header .. body)
> 
> -- Read response.
>-local size = msgpack.decode(sock:read(5))
>+size = msgpack.decode(sock:read(5))
> local header_body = sock:read(size)
>-local header, header_len = msgpack.decode(header_body)
>-local body = msgpack.decode(header_body:sub(header_len))
>+local header_len
>+header, header_len = msgpack.decode(header_body)
>+body = msgpack.decode(header_body:sub(header_len))
> sock:close()
> 
> -- Verify response.
>diff --git a/test/sql-tap/index1.test.lua b/test/sql-tap/index1.test.lua
>index e173e685c..4c4a37ca7 100755
>--- a/test/sql-tap/index1.test.lua
>+++ b/test/sql-tap/index1.test.lua
>@@ -106,7 +106,6 @@ test:do_test(
> test:do_test(
>     "index-2.2",
>     function()
>- local msg
>         local v , msg= pcall(function()
>             test:execsql("CREATE INDEX index1 ON test1(f1, f2, f4, f3)")
>             end)
>diff --git a/test/sql-tap/join3.test.lua b/test/sql-tap/join3.test.lua
>index 876b3121a..030fbaba3 100755
>--- a/test/sql-tap/join3.test.lua
>+++ b/test/sql-tap/join3.test.lua
>@@ -49,7 +49,7 @@ for N=1, bitmask_size do
> end
> -- Joins with a comparison
> --
>-local result = {}
>+result = {}
> --for _ in X(0, "X!for", [=[["set N 1","$N<=$bitmask_size","incr N"]]=]) do
> for N=1, bitmask_size do
>     table.insert(result,N)
>diff --git a/test/sql-tap/select9.test.lua b/test/sql-tap/select9.test.lua
>index 1ae16a658..bcc270593 100755
>--- a/test/sql-tap/select9.test.lua
>+++ b/test/sql-tap/select9.test.lua
>@@ -60,10 +60,8 @@ function subrange(t, first, last)
> end
> 
> local function test_compound_select(testname, sql, result)
>- local nCol = 1
>     local A = box.execute(sql) --test.box(sql)
>- nCol = #A.metadata
>- A = A.rows
>+ local nCol = #A.metadata
>     local nRow = #result / nCol
>     local compound_sql = sql
>     test:do_execsql_test(
>@@ -274,10 +272,8 @@ test:do_execsql_test(
>         -- </select9-2.0>
>     })
> 
>-local t1_space_id = ""
>-local t2_space_id = ""
>-t1_space_id = test:execsql([[SELECT * from "_space" where "name"='T1']])["id"]
>-t2_space_id = test:execsql([[SELECT * from "_space" where "name"='T2']])["id"]
>+local t1_space_id = test:execsql([[SELECT * from "_space" where "name"='T1']])["id"]
>+local t2_space_id = test:execsql([[SELECT * from "_space" where "name"='T2']])["id"]
> --X(276, "X!cmd", [=[["db","eval","SELECT * from _space where name='t2'","data","\n set t2_space_id $data(id)\n"]]=])
> --local function reverse(lhs, rhs)
> -- return X(283, "X!cmd", [=[["string","compare",["rhs"],["lhs"]]]=])
>diff --git a/test/sql-tap/tkt-fa7bf5ec.test.lua b/test/sql-tap/tkt-fa7bf5ec.test.lua
>index 7152e028c..25d44c9d3 100755
>--- a/test/sql-tap/tkt-fa7bf5ec.test.lua
>+++ b/test/sql-tap/tkt-fa7bf5ec.test.lua
>@@ -20,9 +20,9 @@ test:plan(1)
> -- The problem described by this ticket was that the sqlExprCompare()
> -- function was saying that expressions (x='a') and (x='A') were identical
> -- because it was using sqlStrICmp() instead of strcmp() to compare string
>--- literals. That was causing the query optimizer for aggregate queries to
>--- believe that both count() operations were identical, and thus only
>--- computing the first count() and making a copy of the result for the
>+-- literals. That was causing the query optimizer for aggregate queries to
>+-- believe that both count() operations were identical, and thus only
>+-- computing the first count() and making a copy of the result for the
> -- second count().
> --
> -- ["set","testdir",[["file","dirname",["argv0"]]]]
>diff --git a/test/sql-tap/where2.test.lua b/test/sql-tap/where2.test.lua
>index f267be8e6..f2db6fcee 100755
>--- a/test/sql-tap/where2.test.lua
>+++ b/test/sql-tap/where2.test.lua
>@@ -115,7 +115,7 @@ local function queryplan(sql)
>                 table.insert(data, tab)
>                 table.insert(data, idx)
>             else
>- as, tab = string.match(v, "TABLE (%w+ AS) (%w+)")
>+ _, tab = string.match(v, "TABLE (%w+ AS) (%w+)")
>                 if tab == nil then
>                     tab = string.match(v, "TABLE (%w+)")
>                 end
>diff --git a/test/sql/lua/sql_tokenizer.lua b/test/sql/lua/sql_tokenizer.lua
>index 9922d792d..ffe4fb4e8 100644
>--- a/test/sql/lua/sql_tokenizer.lua
>+++ b/test/sql/lua/sql_tokenizer.lua
>@@ -134,7 +134,7 @@ end
> -- @retval Token type. If the rest of the SQL request consists of
> -- spaces and comments, then return TK_EMPTY.
> local function get_next_token(context)
>- local c = ''
>+ local c
>     repeat
>         local i = context.offset
>         c = context.sql:sub(i, i)
>diff --git a/test/sql/savepoints.result b/test/sql/savepoints.result
>index 509c33e59..b0915f398 100644
>--- a/test/sql/savepoints.result
>+++ b/test/sql/savepoints.result
>@@ -102,12 +102,12 @@ collision_sv_2 = function()
>     box.begin()
>     box.execute('SAVEPOINT t1;')
>     box.execute('SAVEPOINT t2;')
>- local _,err = box.execute('SAVEPOINT t1;')
>+ local _, err = box.execute('SAVEPOINT t1;')
>     assert(err == nil)
>     box.execute('RELEASE SAVEPOINT t1;')
>- local _,err = box.execute('RELEASE SAVEPOINT t1;')
>+ _, err = box.execute('RELEASE SAVEPOINT t1;')
>     assert(err ~= nil)
>- local _, err = box.execute('ROLLBACK TO t2;')
>+ _, err = box.execute('ROLLBACK TO t2;')
>     assert(err == nil)
> end;
> ---
>diff --git a/test/sql/savepoints.test.lua b/test/sql/savepoints.test.lua
>index f1b15c748..eb7bea37d 100644
>--- a/test/sql/savepoints.test.lua
>+++ b/test/sql/savepoints.test.lua
>@@ -65,12 +65,12 @@ collision_sv_2 = function()
>     box.begin()
>     box.execute('SAVEPOINT t1;')
>     box.execute('SAVEPOINT t2;')
>- local _,err = box.execute('SAVEPOINT t1;')
>+ local _, err = box.execute('SAVEPOINT t1;')
>     assert(err == nil)
>     box.execute('RELEASE SAVEPOINT t1;')
>- local _,err = box.execute('RELEASE SAVEPOINT t1;')
>+ _, err = box.execute('RELEASE SAVEPOINT t1;')
>     assert(err ~= nil)
>- local _, err = box.execute('ROLLBACK TO t2;')
>+ _, err = box.execute('ROLLBACK TO t2;')
>     assert(err == nil)
> end;
> collision_sv_2();
>diff --git a/test/sql/triggers.result b/test/sql/triggers.result
>index ceecb8ef2..e70d72947 100644
>--- a/test/sql/triggers.result
>+++ b/test/sql/triggers.result
>@@ -11,7 +11,7 @@ _ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
> ---
> ...
> -- Get invariant part of the tuple; name and opts don't change.
>- function immutable_part(data) local r = {} for i, l in pairs(data) do table.insert(r, {l.name, l.opts}) end return r end
>+ function immutable_part(data) local r = {} for _, l in pairs(data) do table.insert(r, {l.name, l.opts}) end return r end
> ---
> ...
> --
>diff --git a/test/sql/triggers.test.lua b/test/sql/triggers.test.lua
>index f5c8a3961..bc694ebc4 100644
>--- a/test/sql/triggers.test.lua
>+++ b/test/sql/triggers.test.lua
>@@ -4,7 +4,7 @@ engine = test_run:get_cfg('engine')
> _ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
> 
> -- Get invariant part of the tuple; name and opts don't change.
>- function immutable_part(data) local r = {} for i, l in pairs(data) do table.insert(r, {l.name, l.opts}) end return r end
>+ function immutable_part(data) local r = {} for _, l in pairs(data) do table.insert(r, {l.name, l.opts}) end return r end
> 
> --
> -- gh-3273: Move Triggers to server
>diff --git a/test/vinyl/large.lua b/test/vinyl/large.lua
>index e10e94c1a..a11642ff0 100644
>--- a/test/vinyl/large.lua
>+++ b/test/vinyl/large.lua
>@@ -1,5 +1,5 @@
>-fiber = require('fiber')
>-digest = require('digest')
>+local fiber = require('fiber')
>+local digest = require('digest')
> 
> local PAGE_SIZE = 1024
> local RANGE_SIZE = 64 * PAGE_SIZE
>diff --git a/test/vinyl/stat.result b/test/vinyl/stat.result
>index d35def13d..914c2ede4 100644
>--- a/test/vinyl/stat.result
>+++ b/test/vinyl/stat.result
>@@ -1792,13 +1792,15 @@ dump(1, 100) -- split + compaction
> wait_compaction(3)
> ---
> ...
>-i:stat().range_count -- 2
>+assert(i:stat().range_count, 2)
> ---
> - 2
>+- 2
> ...
>-i:stat().dumps_per_compaction -- 1
>+assert(i:stat().dumps_per_compaction, 1)
> ---
> - 1
>+- 1
> ...
> dump(1, 10)
> ---
>@@ -1809,9 +1811,10 @@ dump(1, 40) -- compaction in range 1
> wait_compaction(4)
> ---
> ...
>-i:stat().dumps_per_compaction -- 1
>+assert(i:stat().dumps_per_compaction, 1)
> ---
> - 1
>+- 1
> ...
> dump(90, 100)
> ---
>@@ -1822,9 +1825,10 @@ dump(60, 100) -- compaction in range 2
> wait_compaction(5)
> ---
> ...
>-i:stat().dumps_per_compaction -- 2
>+assert(i:stat().dumps_per_compaction, 2)
> ---
> - 2
>+- 2
> ...
> -- Forcing compaction manually doesn't affect dumps_per_compaction.
> dump(40, 60)
>@@ -1836,9 +1840,10 @@ i:compact()
> wait_compaction(7)
> ---
> ...
>-i:stat().dumps_per_compaction -- 2
>+assert(i:stat().dumps_per_compaction, 2)
> ---
> - 2
>+- 2
> ...
> test_run:cmd('restart server test')
> fiber = require('fiber')
>@@ -1853,9 +1858,10 @@ s = box.space.test
> i = s.index.primary
> ---
> ...
>-i:stat().dumps_per_compaction -- 2
>+assert(i:stat().dumps_per_compaction, 2)
> ---
> - 2
>+- 2
> ...
> for i = 1, 100 do s:replace{i, digest.urandom(100)} end
> ---
>@@ -1868,9 +1874,10 @@ test_run:wait_cond(function() return i:stat().disk.compaction.count == 2 end, 10
> ---
> - true
> ...
>-i:stat().dumps_per_compaction -- 1
>+assert(i:stat().dumps_per_compaction, 1)
> ---
> - 1
>+- 1
> ...
> s:drop()
> ---
>@@ -1892,9 +1899,10 @@ s:insert{1}
> ---
> - [1]
> ...
>-i:stat().txw.rows -- 1
>+assert(i:stat().txw.rows, 1)
> ---
> - 1
>+- 1
> ...
> sv = box.savepoint()
> ---
>@@ -1903,23 +1911,26 @@ s:insert{2}
> ---
> - [2]
> ...
>-i:stat().txw.rows -- 2
>+assert(i:stat().txw.rows, 2)
> ---
> - 2
>+- 2
> ...
> box.rollback_to_savepoint(sv)
> ---
> ...
>-i:stat().txw.rows -- 1
>+assert(i:stat().txw.rows, 1)
> ---
> - 1
>+- 1
> ...
> box.commit()
> ---
> ...
>-i:stat().txw.rows -- 0
>+assert(i:stat().txw.rows, 0)
> ---
> - 0
>+- 0
> ...
> s:drop()
> ---
>diff --git a/test/vinyl/stat.test.lua b/test/vinyl/stat.test.lua
>index a8657ccf4..7ff2d95f3 100644
>--- a/test/vinyl/stat.test.lua
>+++ b/test/vinyl/stat.test.lua
>@@ -555,24 +555,24 @@ i:stat().dumps_per_compaction -- 1
> dump(1, 100) -- compaction
> dump(1, 100) -- split + compaction
> wait_compaction(3)
>-i:stat().range_count -- 2
>-i:stat().dumps_per_compaction -- 1
>+assert(i:stat().range_count, 2)
>+assert(i:stat().dumps_per_compaction, 1)
> 
> dump(1, 10)
> dump(1, 40) -- compaction in range 1
> wait_compaction(4)
>-i:stat().dumps_per_compaction -- 1
>+assert(i:stat().dumps_per_compaction, 1)
> 
> dump(90, 100)
> dump(60, 100) -- compaction in range 2
> wait_compaction(5)
>-i:stat().dumps_per_compaction -- 2
>+assert(i:stat().dumps_per_compaction, 2)
> 
> -- Forcing compaction manually doesn't affect dumps_per_compaction.
> dump(40, 60)
> i:compact()
> wait_compaction(7)
>-i:stat().dumps_per_compaction -- 2
>+assert(i:stat().dumps_per_compaction, 2)
> 
> test_run:cmd('restart server test')
> 
>@@ -582,12 +582,12 @@ digest = require('digest')
> s = box.space.test
> i = s.index.primary
> 
>-i:stat().dumps_per_compaction -- 2
>+assert(i:stat().dumps_per_compaction, 2)
> for i = 1, 100 do s:replace{i, digest.urandom(100)} end
> box.snapshot()
> test_run:wait_cond(function() return i:stat().disk.compaction.count == 2 end, 10)
> 
>-i:stat().dumps_per_compaction -- 1
>+assert(i:stat().dumps_per_compaction, 1)
> 
> s:drop()
> 
>@@ -599,14 +599,14 @@ s = box.schema.space.create('test', {engine = 'vinyl'})
> i = s:create_index('pk')
> box.begin()
> s:insert{1}
>-i:stat().txw.rows -- 1
>+assert(i:stat().txw.rows, 1)
> sv = box.savepoint()
> s:insert{2}
>-i:stat().txw.rows -- 2
>+assert(i:stat().txw.rows, 2)
> box.rollback_to_savepoint(sv)
>-i:stat().txw.rows -- 1
>+assert(i:stat().txw.rows, 1)
> box.commit()
>-i:stat().txw.rows -- 0
>+assert(i:stat().txw.rows, 0)
> s:drop()
> 
> test_run:cmd('switch default')
>diff --git a/test/vinyl/txn_proxy.lua b/test/vinyl/txn_proxy.lua
>index 7a4d0b865..15b0e4add 100644
>--- a/test/vinyl/txn_proxy.lua
>+++ b/test/vinyl/txn_proxy.lua
>@@ -1,11 +1,11 @@
>--- A fiber can't use multiple transactions simultaneously;
>+-- A fiber can't use multiple transactions simultaneously;
> -- i.e. [fiber] --? [transaction] in UML parlor.
> --
> -- This module provides a simple transaction proxy facility
>--- to control multiple transactions at once. A proxy executes
>+-- to control multiple transactions at once. A proxy executes
> -- statements in a worker fiber in order to overcome
> -- "one transaction per fiber" limitation.
>---
>+--
> -- Ex:
> -- proxy = require('txn_proxy').new()
> -- proxy:begin()
>diff --git a/test/vinyl/vinyl.lua b/test/vinyl/vinyl.lua
>index 31307f4bc..02b5c010b 100644
>--- a/test/vinyl/vinyl.lua
>+++ b/test/vinyl/vinyl.lua
>@@ -15,7 +15,7 @@ box.cfg {
>     vinyl_max_tuple_size = 1024 * 1024 * 6,
> }
> 
>-function box_info_sort(data)
>+local function box_info_sort(data)
>     if type(data)~='table' then
>         return data
>     end
>diff --git a/test/wal_off/rtree_benchmark.result b/test/wal_off/rtree_benchmark.result
>index 8e01c9f2a..8deefca82 100644
>--- a/test/wal_off/rtree_benchmark.result
>+++ b/test/wal_off/rtree_benchmark.result
>@@ -163,7 +163,7 @@ for i = 1, 0 do
>    for j = 1, dimension do
>       table.insert(rect, 180*math.random())
>    end
>- for k,v in pairs(s.index.spatial:select(rect, {limit = n_neighbors, iterator = 'NEIGHBOR'})) do
>+ for _,_ in pairs(s.index.spatial:select(rect, {limit = n_neighbors, iterator = 'NEIGHBOR'})) do
>       n = n + 1
>    end
> end;
>diff --git a/test/wal_off/rtree_benchmark.test.lua b/test/wal_off/rtree_benchmark.test.lua
>index 6fae977c9..6bdc0a758 100644
>--- a/test/wal_off/rtree_benchmark.test.lua
>+++ b/test/wal_off/rtree_benchmark.test.lua
>@@ -96,7 +96,7 @@ for i = 1, 0 do
>    for j = 1, dimension do
>       table.insert(rect, 180*math.random())
>    end
>- for k,v in pairs(s.index.spatial:select(rect, {limit = n_neighbors, iterator = 'NEIGHBOR'})) do
>+ for _,_ in pairs(s.index.spatial:select(rect, {limit = n_neighbors, iterator = 'NEIGHBOR'})) do
>       n = n + 1
>    end
> end;
>diff --git a/test/xlog-py/box.lua b/test/xlog-py/box.lua
>index c87f7b94b..8b9e9434f 100644
>--- a/test/xlog-py/box.lua
>+++ b/test/xlog-py/box.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> 
> box.cfg{
>     listen = os.getenv("LISTEN"),
>diff --git a/test/xlog/big_tx.result b/test/xlog/big_tx.result
>index 48085031b..837a4b478 100644
>--- a/test/xlog/big_tx.result
>+++ b/test/xlog/big_tx.result
>@@ -11,7 +11,7 @@ t = box.space.big_tx:insert({1, digest.urandom(512 * 1024)})
> ---
> ...
> env:cmd('restart server default')
>-#box.space.big_tx:select()
>+assert(#box.space.big_tx:select())
> ---
> - 1
> ...
>diff --git a/test/xlog/big_tx.test.lua b/test/xlog/big_tx.test.lua
>index b90a14a82..09624ed53 100644
>--- a/test/xlog/big_tx.test.lua
>+++ b/test/xlog/big_tx.test.lua
>@@ -5,7 +5,7 @@ _ = box.schema.space.create('big_tx'):create_index('pk')
> t = box.space.big_tx:insert({1, digest.urandom(512 * 1024)})
> env:cmd('restart server default')
> 
>-#box.space.big_tx:select()
>+assert(#box.space.big_tx:select())
> 
> box.space.big_tx:drop()
> 
>diff --git a/test/xlog/checkpoint_daemon.result b/test/xlog/checkpoint_daemon.result
>index 5be7124fe..dc806ea1d 100644
>--- a/test/xlog/checkpoint_daemon.result
>+++ b/test/xlog/checkpoint_daemon.result
>@@ -118,11 +118,11 @@ wait_snapshot_gc(WAIT_COND_TIMEOUT)
> ---
> - true
> ...
>-#snaps == 2 or snaps
>+assert(#snaps == 2 or snaps)
> ---
> - true
> ...
>-#xlogs > 0
>+assert(#xlogs > 0)
> ---
> - true
> ...
>diff --git a/test/xlog/checkpoint_daemon.test.lua b/test/xlog/checkpoint_daemon.test.lua
>index d3138f356..0ef3d89da 100644
>--- a/test/xlog/checkpoint_daemon.test.lua
>+++ b/test/xlog/checkpoint_daemon.test.lua
>@@ -70,8 +70,8 @@ for i = 1, row_count_per_wal + 10 do space:insert { no } no = no + 1 end
> wait_snapshot(WAIT_COND_TIMEOUT)
> wait_snapshot_gc(WAIT_COND_TIMEOUT)
> 
>-#snaps == 2 or snaps
>-#xlogs > 0
>+assert(#snaps == 2 or snaps)
>+assert(#xlogs > 0)
> 
> -- gh-2780: check that a last snapshot mtime will be changed at
> -- least two times.
>diff --git a/test/xlog/panic.lua b/test/xlog/panic.lua
>index 2d4eb8d2e..0fa855421 100644
>--- a/test/xlog/panic.lua
>+++ b/test/xlog/panic.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> 
> box.cfg{
>     listen = os.getenv("LISTEN"),
>diff --git a/test/xlog/panic_on_wal_error.result b/test/xlog/panic_on_wal_error.result
>index 22f14f912..7bdd5119a 100644
>--- a/test/xlog/panic_on_wal_error.result
>+++ b/test/xlog/panic_on_wal_error.result
>@@ -19,7 +19,7 @@ _ = box.space.test:create_index('pk')
> -- reopen xlog
> --
> test_run:cmd("restart server default")
>-box.space.test ~= nil
>+assert(box.space.test ~= nil)
> ---
> - true
> ...
>diff --git a/test/xlog/panic_on_wal_error.test.lua b/test/xlog/panic_on_wal_error.test.lua
>index 2e95431c6..0a72bf44b 100644
>--- a/test/xlog/panic_on_wal_error.test.lua
>+++ b/test/xlog/panic_on_wal_error.test.lua
>@@ -10,7 +10,7 @@ _ = box.space.test:create_index('pk')
> -- reopen xlog
> --
> test_run:cmd("restart server default")
>-box.space.test ~= nil
>+assert(box.space.test ~= nil)
> -- insert some stuff
> --
> box.space.test:auto_increment{'before snapshot'}
>diff --git a/test/xlog/reader.result b/test/xlog/reader.result
>index 9985aa2ac..74ac3579e 100644
>--- a/test/xlog/reader.result
>+++ b/test/xlog/reader.result
>@@ -40,7 +40,7 @@ trun:cmd("setopt delimiter ';'")
> ...
> function collect_results(file)
>     local val = {}
>- for k, v in xlog(file) do
>+ for _, v in xlog(file) do
>         table.insert(val, setmetatable(v, { __serialize = "map"}))
>     end
>     return val
>diff --git a/test/xlog/reader.test.lua b/test/xlog/reader.test.lua
>index 327af54dd..707ba394b 100644
>--- a/test/xlog/reader.test.lua
>+++ b/test/xlog/reader.test.lua
>@@ -21,7 +21,7 @@ pattern_ok_v13 = fio.pathjoin(pattern_prefix, "v13/")
> trun:cmd("setopt delimiter ';'")
> function collect_results(file)
>     local val = {}
>- for k, v in xlog(file) do
>+ for _, v in xlog(file) do
>         table.insert(val, setmetatable(v, { __serialize = "map"}))
>     end
>     return val
>diff --git a/test/xlog/snap_io_rate.test.lua b/test/xlog/snap_io_rate.test.lua
>index f71296269..5626ea1f4 100644
>--- a/test/xlog/snap_io_rate.test.lua
>+++ b/test/xlog/snap_io_rate.test.lua
>@@ -9,6 +9,6 @@ for i = 0, 127 do box.space.snap:replace({i, digest.urandom(512 * 1024)}) end
> t1 = fiber.time()
> box.snapshot()
> t2 = fiber.time()
>-t2 - t1 > 64 / box.cfg.snap_io_rate_limit * 0.95
>+assert(t2 - t1 > 64 / box.cfg.snap_io_rate_limit * 0.95)
> 
> box.space.snap:drop()
>diff --git a/test/xlog/transaction.result b/test/xlog/transaction.result
>index 63adb0f25..376fea486 100644
>--- a/test/xlog/transaction.result
>+++ b/test/xlog/transaction.result
>@@ -16,7 +16,7 @@ test_run:cmd("setopt delimiter ';'")
> ...
> function read_xlog(file)
>     local val = {}
>- for k, v in xlog(file) do
>+ for _, v in xlog(file) do
>         table.insert(val, setmetatable(v, { __serialize = "map"}))
>     end
>     return val
>@@ -69,37 +69,37 @@ data = read_xlog(fio.pathjoin(box.cfg.wal_dir, string.rep('0', 20 - #lsn_str) ..
> ---
> ...
> -- check nothing changed for single row transactions
>-data[1].HEADER.tsn == nil and data[1].HEADER.commit == nil
>+assert(data[1].HEADER.tsn == nil and data[1].HEADER.commit == nil)
> ---
> - true
> ...
>-data[2].HEADER.tsn == nil and data[2].HEADER.commit == nil
>+assert(data[2].HEADER.tsn == nil and data[2].HEADER.commit == nil)
> ---
> - true
> ...
> -- check two row transaction
>-data[3].HEADER.tsn == data[3].HEADER.lsn and data[3].HEADER.commit == nil
>+assert(data[3].HEADER.tsn == data[3].HEADER.lsn and data[3].HEADER.commit == nil)
> ---
> - true
> ...
>-data[4].HEADER.tsn == data[3].HEADER.tsn and data[4].HEADER.commit == true
>+assert(data[4].HEADER.tsn == data[3].HEADER.tsn and data[4].HEADER.commit == true)
> ---
> - true
> ...
> -- check four row transaction
>-data[5].HEADER.tsn == data[5].HEADER.lsn and data[5].HEADER.commit == nil
>+assert(data[5].HEADER.tsn == data[5].HEADER.lsn and data[5].HEADER.commit == nil)
> ---
> - true
> ...
>-data[6].HEADER.tsn == data[5].HEADER.tsn and data[6].HEADER.commit == nil
>+assert(data[6].HEADER.tsn == data[5].HEADER.tsn and data[6].HEADER.commit == nil)
> ---
> - true
> ...
>-data[7].HEADER.tsn == data[5].HEADER.tsn and data[7].HEADER.commit == nil
>+assert(data[7].HEADER.tsn == data[5].HEADER.tsn and data[7].HEADER.commit == nil)
> ---
> - true
> ...
>-data[8].HEADER.tsn == data[5].HEADER.tsn and data[8].HEADER.commit == true
>+assert(data[8].HEADER.tsn == data[5].HEADER.tsn and data[8].HEADER.commit == true)
> ---
> - true
> ...
>diff --git a/test/xlog/transaction.test.lua b/test/xlog/transaction.test.lua
>index 2d8090b4c..c196064ef 100644
>--- a/test/xlog/transaction.test.lua
>+++ b/test/xlog/transaction.test.lua
>@@ -6,7 +6,7 @@ test_run = env.new()
> test_run:cmd("setopt delimiter ';'")
> function read_xlog(file)
>     local val = {}
>- for k, v in xlog(file) do
>+ for _, v in xlog(file) do
>         table.insert(val, setmetatable(v, { __serialize = "map"}))
>     end
>     return val
>@@ -33,14 +33,14 @@ box.snapshot()
> lsn_str = tostring(lsn)
> data = read_xlog(fio.pathjoin(box.cfg.wal_dir, string.rep('0', 20 - #lsn_str) .. tostring(lsn_str) .. '.xlog'))
> -- check nothing changed for single row transactions
>-data[1].HEADER.tsn == nil and data[1].HEADER.commit == nil
>-data[2].HEADER.tsn == nil and data[2].HEADER.commit == nil
>+assert(data[1].HEADER.tsn == nil and data[1].HEADER.commit == nil)
>+assert(data[2].HEADER.tsn == nil and data[2].HEADER.commit == nil)
> -- check two row transaction
>-data[3].HEADER.tsn == data[3].HEADER.lsn and data[3].HEADER.commit == nil
>-data[4].HEADER.tsn == data[3].HEADER.tsn and data[4].HEADER.commit == true
>+assert(data[3].HEADER.tsn == data[3].HEADER.lsn and data[3].HEADER.commit == nil)
>+assert(data[4].HEADER.tsn == data[3].HEADER.tsn and data[4].HEADER.commit == true)
> -- check four row transaction
>-data[5].HEADER.tsn == data[5].HEADER.lsn and data[5].HEADER.commit == nil
>-data[6].HEADER.tsn == data[5].HEADER.tsn and data[6].HEADER.commit == nil
>-data[7].HEADER.tsn == data[5].HEADER.tsn and data[7].HEADER.commit == nil
>-data[8].HEADER.tsn == data[5].HEADER.tsn and data[8].HEADER.commit == true
>+assert(data[5].HEADER.tsn == data[5].HEADER.lsn and data[5].HEADER.commit == nil)
>+assert(data[6].HEADER.tsn == data[5].HEADER.tsn and data[6].HEADER.commit == nil)
>+assert(data[7].HEADER.tsn == data[5].HEADER.tsn and data[7].HEADER.commit == nil)
>+assert(data[8].HEADER.tsn == data[5].HEADER.tsn and data[8].HEADER.commit == true)
> box.space.test:drop()
>diff --git a/test/xlog/xlog.lua b/test/xlog/xlog.lua
>index 004096d2d..aaf1a0ae6 100644
>--- a/test/xlog/xlog.lua
>+++ b/test/xlog/xlog.lua
>@@ -1,5 +1,5 @@
> #!/usr/bin/env tarantool
>-os = require('os')
>+local os = require('os')
> 
> box.cfg{
>     listen = os.getenv("LISTEN"),
>--
>2.23.0
>  
 
 
--
Alexander Tikhonov