Luatest¶

Overview¶

Tool for testing tarantool applications. (Build Status).

Highlights:

• executable to run tests in directory or specific files,
• before/after suite hooks,
• before/after test group hooks,
• output capturing,
• helpers for testing tarantool applications,
• luacov integration.

Requirements¶

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

Installation¶

tarantoolctl rocks install luatest

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

Usage¶

Define tests.

-- test/feature_test.lua
local t = require('luatest')
local g = t.group('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 = t.group()` 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)

-- test/other_test.lua
local t = require('luatest')
local g = t.group('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¶

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'},
})
server:start()
-- 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:connect_net_box()
server.net_box:eval('return do_something(...)', {arg1, arg2})

server:stop()

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' luacov.report.out

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.

Development¶

• 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.

Contributing¶

Bug reports and pull requests are welcome on at https://github.com/tarantool/luatest.

License¶

MIT