Overview | Tarantool
Check out the new release 2.8



Tool for testing tarantool applications. (Build Status).



  • Tarantool (it requires tarantool-specific fio module and ffi from LuaJIT).


tarantoolctl rocks install luatest

.rocks/bin/luatest --help # list available options


Define tests.

-- test/feature_test.lua
local t = require('luatest')
local g ='feature')
-- Default name is inferred from caller filename when possible.
-- For `test/a/b/c_d_test.lua` it will be `a.b.c_d`.
-- So `local g =` works the same way.

-- Tests. All properties with name staring with `test` are treated as test cases.
g.test_example_1 = function() ... end
g.test_example_n = function() ... end

-- Define suite hooks
t.before_suite(function() ... end)
t.before_suite(function() ... end)

-- Hooks to run once for tests group
g.before_all(function() ... end)
g.after_all(function() ... end)

-- Hooks to run for each test in group
g.before_each(function() ... end)
g.after_each(function() ... end)

-- Hooks to run for a specified test in group
g.before_test('test_example_1', function() ... end)
g.after_test('test_example_2', function() ... end)
-- before_test runs after before_each
-- after_test runs before after_each

-- test/other_test.lua
local t = require('luatest')
local g ='other')
-- ...
g.test_example_2 = function() ... end
g.test_example_m = function() ... end

Run them.

luatest --help                        # list available options
luatest                               # run all in ./test directory
luatest test/feature_test.lua         # run test by file
luatest test/integration              # run all within directory
luatest feature other.test_example_2  # run by group or test name

Luatest automatically requires test/helper.lua file if it’s present. You can configure luatest or run any bootstrap code there.

See the getting-started example in cartridge-cli repo.

Tests order

Use the --shuffle option to tell luatest how to order the tests. The available ordering schemes are group, all and none.

group shuffles tests within the groups.

all randomizes execution order across all available tests. Be careful: before_all/after_all hooks run always when test group is changed, so it may run multiple time.

none is the default, which executes examples within the group in the order they are defined (eventually they are ordered by functions line numbers).

With group and all you can also specify a seed to reproduce specific order.

--shuffle none
--shuffle group
--shuffle all --seed 123
--shuffle all:123 # same as above

To change default order use:

-- test/helper.lua
local t = require('luatest')
t.configure({shuffle = 'group'})

List of luatest functions

assert (value[, message]) Check that value is truthy.
assert_almost_equals (actual, expected, margin[, message]) Check that two floats are close by margin.
assert_covers (actual, expected[, message]) Checks that actual map includes expected one.
assert_lt (left, right[, message]) Compare numbers.
assert_le (left, right[, message])  
assert_gt (left, right[, message])  
assert_ge (left, right[, message])  
assert_equals (actual, expected[, message[, deep_analysis]]) Check that two values are equal.
assert_error (fn, ...) Check that calling fn raises an error.
assert_error_msg_contains (expected_partial, fn, ...)  
assert_error_msg_content_equals (expected, fn, ...) Strips location info from message text.
assert_error_msg_equals (expected, fn, ...) Checks full error: location and text.
assert_error_msg_matches (pattern, fn, ...)  
assert_eval_to_false (value[, message]) Alias for assert_not.
assert_eval_to_true (value[, message]) Alias for assert.
assert_items_include (actual, expected[, message]) Checks that actual includes all items of expected.
assert_is (actual, expected[, message]) Check that values are the same.
assert_is_not (actual, expected[, message]) Check that values are not the same.
assert_items_equals (actual, expected[, message]) Checks equality of tables regardless of the order of elements.
assert_nan (value[, message])  
assert_not (value[, message]) Check that value is falsy.
assert_not_almost_equals (actual, expected, margin[, message]) Check that two floats are not close by margin
assert_not_covers (actual, expected[, message]) Checks that map does not contain the other one.
assert_not_equals (actual, expected[, message]) Check that two values are not equal.
assert_not_nan (value[, message])  
assert_not_str_contains (actual, expected[, is_pattern[, message]]) Case-sensitive strings comparison.
assert_not_str_icontains (value, expected[, message]) Case-insensitive strings comparison.
assert_str_contains (value, expected[, is_pattern[, message]]) Case-sensitive strings comparison.
assert_str_icontains (value, expected[, message]) Case-insensitive strings comparison.
assert_str_matches (value, pattern[, start=1[, final=value:len() [, message]]]) Verify a full match for the string.
assert_type (value, expected_type[, message]) Check value’s type.
Flow control
fail (message) Stops a test due to a failure.
fail_if (condition, message) Stops a test due to a failure if condition is met.
skip (message) Skip a running test.
skip_if (condition, message) Skip a running test if condition is met.
success () Stops a test with a success.
success_if (condition) Stops a test with a success if condition is met.
Suite and groups
after_suite (fn) Add after suite hook.
before_suite (fn) Add before suite hook.
group (name) Create group of tests.

Capturing output

By default runner captures all stdout/stderr output and shows it only for failed tests. Capturing can be disabled with -c flag.

Test helpers

There are helpers to run tarantool applications and perform basic interaction with it. If application follows configuration conventions it is possible to use options to configure server instance and helpers at the same time. For example http_port is used to perform http request in tests and passed in TARANTOOL_HTTP_PORT to server process.

local server = luatest.Server:new({
    command = '/path/to/executable.lua',
    -- arguments for process
    args = {'--no-bugs', '--fast'},
    -- additional envars to pass to process
    env = {SOME_FIELD = 'value'},
    -- passed as TARANTOOL_WORKDIR
    workdir = '/path/to/test/workdir',
    -- passed as TARANTOOL_HTTP_PORT, used in http_request
    http_port = 8080,
    -- passed as TARANTOOL_LISTEN, used in connect_net_box
    net_box_port = 3030,
    -- passed to net_box.connect in connect_net_box
    net_box_credentials = {user = 'username', password = 'secret'},
-- Wait until server is ready to accept connections.
-- This may vary from app to app: for one server:connect_net_box() is enough,
-- for another more complex checks are required.
luatest.helpers.retrying({}, function() server:http_request('get', '/ping') end)

-- http requests
server:http_request('get', '/path')
server:http_request('post', '/path', {body = 'text'})
server:http_request('post', '/path', {json = {field = value}, http = {
    -- http client options
    headers = {Authorization = 'Basic ' .. credentials},
    timeout = 1,

-- This method throws error when response status is outside of then range 200..299.
-- To change this behaviour, path `raise = false`:
t.assert_equals(server:http_request('get', '/not_found', {raise = false}).status, 404)
t.assert_error(function() server:http_request('get', '/not_found') end)

-- using net_box
server:eval('return do_something(...)', {arg1, arg2})
server:call('function_name', {arg1, arg2})

luatest.Process:start(path, args, env) provides low-level interface to run any other application.

There are several small helpers for common actions:

luatest.helpers.uuid('ab', 2, 1) == 'abababab-0002-0000-0000-000000000001'

luatest.helpers.retrying({timeout = 1, delay = 0.1}, failing_function, arg1, arg2)
-- wait until server is up
luatest.helpers.retrying({}, function() server:http_request('get', '/status') end)

luacov integration

  • Install luacov with tarantoolctl rocks install luacov
  • Configure it with .luacov file
  • Clean old reports rm -f luacov.*.out*
  • Run luatest with --coverage option
  • Generate report with .rocks/bin/luacov .
  • Show summary with grep -A999 '^Summary'

When running integration tests with coverage collector enabled, luatest automatically starts new tarantool instances with luacov enabled. So coverage is collected from all the instances. However this has some limitations:

  • It works only for instances started with Server helper.
  • Process command should be executable lua file or tarantool with script argument.
  • Instance must be stopped with server:stop(), because this is the point where stats are saved.
  • Don’t save stats concurrently to prevent corruption.


  • Check out the repo.
  • Prepare makefile with cmake ..
  • Install dependencies with make bootstrap.
  • Run it with make lint before committing changes.
  • Run tests with bin/luatest.


Bug reports and pull requests are welcome on at