Luatest

Overview

Tool for testing tarantool applications.

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

tt 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)

-- 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 = t.group('other')
-- ...
g.test_example_2 = function() ... end
g.test_example_m = function() ... end

-- Define parametrized groups
local pg = t.group('pgroup', {{engine = 'memtx'}, {engine = 'vinyl'}})
pg.test_example_3 = function(cg)
    -- Use cg.params here
    box.schema.space.create('test', {
        engine = cg.params.engine,
    })
end

-- Hooks can be specified for one parameter
pg.before_all({engine = 'memtx'}, function() ... end)
pg.before_each({engine = 'memtx'}, function() ... end)
pg.before_test('test_example_3', {engine = 'vinyl'}, function() ... end)

Run tests from a path.

luatest                               # run all tests from the ./test directory
luatest test/integration              # run all tests from the specified directory
luatest test/feature_test.lua         # run all tests from the specified file

Run tests from a group.

luatest feature                       # run all tests from the specified group
luatest other.test_example_2          # run one test from the specified group
luatest feature other.test_example_2  # run tests by group and test name

Note that luatest recognizes an input parameter as a path only if it contains /, otherwise, it will be considered as a group name.

luatest feature                       # considered as a group name
luatest ./feature                     # considered as a path
luatest feature/                      # considered as a path

You can also use -p option in combination with the examples above for running tests matching to some name pattern.

luatest feature -p test_example       # run all tests from the specified group matching to the specified pattern

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'})

Preloaded hooks

Preloaded hooks extend base hooks. They behave like the pytest fixture with the autouse parameter.

If you run the following test:

Then the hooks are executed in the following sequence:

List of luatest functions

XFail

The xfail mark makes test results to be interpreted vice versa: it’s threated as passed when an assertion fails, and it fails if no errors are raised. It allows one to mark a test as temporarily broken due to a bug in some other component which can’t be fixed immediately. It’s also a good practice to keep xfail tests in sync with an issue tracker.

local g = t.group()
g.test_fail = function()
    t.xfail('Must fail no matter what')
    t.assert_equals(3, 4)
end

XFail only applies to the errors raised by the luatest assertions. Regular Lua errors still cause the test failure.

Capturing output

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

Tests repeating

Runners can repeat tests with flags -r / --repeat (to repeat all the tests) or -R / --repeat-group (to repeat all the tests within the group).

Parametrization

Test group can be parametrized.

local g = t.group('pgroup', {{a = 1, b = 4}, {a = 2, b = 3}})

g.test_params = function(cg)
    ...
    log.info('a = %s', cg.params.a)
    log.info('b = %s', cg.params.b)
    ...
end

Group can be parametrized with a matrix of parameters using luatest.helpers:

local g = t.group('pgroup', t.helpers.matrix({a = {1, 2}, b = {3, 4}}))
-- Will run:
-- * a = 1, b = 3
-- * a = 1, b = 4
-- * a = 2, b = 3
-- * a = 2, b = 4

Each test will be performed for every params combination. Hooks will work as usual unless there are specified params. The order of execution in the hook group is determined by the order of declaration.

-- called before every test
g.before_each(function(cg) ... end)

-- called before tests when a == 1
g.before_each({a = 1}, function(cg) ... end)

-- called only before the test when a == 1 and b == 3
g.before_each({a = 1, b = 3}, function(cg) ... end)

-- called before test named 'test_something' when a == 1
g.before_test('test_something', {a = 1}, function(cg) ... end)

--etc

Test from a parameterized group can be called from the command line in such a way:

luatest pgroup.a:1.b:4.test_params
luatest pgroup.a:2.b:3.test_params

Note that values for a and b have to match to defined group params. The command below will give you an error because such params are not defined for the group.

luatest pgroup.a:2.b:2.test_params  # will raise an error

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:eval('return do_something(...)', {arg1, arg2})
server:call('function_name', {arg1, arg2})
server:exec(function() return box.info() end)
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 tt 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