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To run the tests in the almost exactly the same environment as CI, use docker. This is recommended to ensure that the tests pass in CI, rather than just on your machine.
./docker/manual/run
.$HOME/YouCompleteMe
cd YouCompleteMe
python3 install.py --ts-completer --clangd-completer --java-completer
sudo -H pip3 install -r python/test_requirements.txt
./test/run_vim_tests
The CI tests run in the container, so it's probably best to run your tests there too, but not strictly required.
To run locally, you have to be on MacOS or Linux. Sorry, Windows testing is not supported. However, there is a docker image in which you can run the tests.
test/docker/ci/image/Dockerfile
)python3 install.py --ts-completer --clangd-completer --java-completer
pip install -r python/test_requirements.txt
)./test/run_vim_tests
NOTE: This environment isn't officially supported, and the preferred mechanism to run the tests is to use docker.
sudo apt-get update && sudo apt-get dist-upgrade
sudo apt-get install build-essential default-jdk vim-nox cmake python3-dev nodejs python3-pip npm
clone the plugin, and build ycmd, e.g.
git clone --recursive https://github.com/ycm-core/YouCompleteMe
cd YouCompleteMe
python3 install.py --ts-completer --clangd-completer --java-completer
Install the test python deps: pip3 install --user -r python/test_requirements.txt
Run ./test/run_vim_tests
The test framework is based on the "new style" Vim tests. These are the tests
that are used to test Vim itself. There is good info on this in :help testing
.
There's also some useful info in Vim's test readme.
In short, the test framework runs Vim, sources the test script, then executes all of the test functions. This is done as follows :
vim --clean --not-a-term -S lib/run_test.vim <test script>.test.vim
The important thing to know is that run_test.vim
is sourced and it in turn
sources the test script, which contains the test functions, which are named
Test_*
.
Test functions should use the vim built-in assert
functions to report errors
(see :help new-style-testing
) and should attempt to reset any changes they
make at the end of the function.
You can add set-up and tear-down functions, and can skip tests by throwing a
message starting with the word 'Skipped' (e.g. throw "SKipped: <message>"
).
The test framework has the following components:
test/lib
) containing the framework itself, comprising:
run_test.vim
, which wraps the test functions and executes them, reporting
failures.plugin/shared.vim
(from Vim)plugin/screendump.vim
(from Vim)autoload/youcompleteme/test/*
test/*.test.vim
The basic structure of a test is as follows:
function! SetUp()
" ... set g:ycm_* options here...
call youcompleteme#test#setup#SetUp()
endfunction
function! TearDown()
call youcompleteme#test#setup#CleanUp()
endfunction
function! Test_MyTest()
" test goes here, e.g.
aseert_true( pyxeval( 'ycm_state.ServerIsHealthy()' ) )
endfunction
" Optional per-test setup/teardown
function! SetUp_Test_MyOtherTest()
let s:old_ycm_use_clangd = g:ycm_use_clangd
let g:ycm_use_clangd=1
endfunction
function! TearDown_Test_MyOtherTest()
let g:ycm_use_clangd=s:old_ycm_use_clangd
endfunction
function! Test_MyOtherTest()
assert_false( 0 )
endfunction
Test scripts are placed in src/test
and are named *.test.vim
. Each
test script can contain any number of individual tests, each of which is
a Vim function named Test_<test name>
. Test functions are run in
arbitrary order, so must not rely on each other.
Each test script is a fixture, but setup and teardown is done for each and every test. Global (one-time) setup can be done at script level, but this is not recommended.
Set up and tear down functions are run before and after tests. You can define one for the whole script, which is run before every test, and a per-test setup/tear down function which is run before both the global setup function and the test function.
To explain, for each function in the script named Test_<test name>
,
run_test.vim
does the following:
SetUp_Test_<test name>
, call itSetUp
, call itTest_<test name>
TearDown
, call itTearDown_Test_<test name>
, call itIf the v:errors
list is non-empty at the end of the tests, the test
test name
is marked as failed.
If any of these functions raises an exception, it is added to v:errors
, unless
the test is called Test_nocatch_<test name>
, in which case exceptions are not
caught be the test and should be handled by the test function itself.
If a test fails, run_test.vim
attempts to print out all of the log files that
YCM's ycm_state
object knows about.
The "plugin" provides a handful of things, some of which were simply ported from Vim's test framework, and some were written specifically for YCM.
These are general purpose functions which are commonly used:
WaitForAssert
: This one is the most useful. It takes a callable (usually a
lambda) and waits for it to return 0, but allows the Vim event loop to run in
between calls. This is key to ensuring that the YCM code can execute while the
script is actively trying to test it. NOTE: It waits for the function to
return 0, NOT for the assert to be true/v:errors to be empty!The autoload functions perform some useful common YCM-specific stuff such as setup and teardown, and will likely be built out over time as the suite increases in size and complexity.
Things that you need to know to write tests effectively:
Don't forget to :%bwipeout!
at the end of each test function.
Understand the arguments to feedkeys
. Importantly, if you want it to behave
the way you think it should, use feedkey( "...", 'xt' )
. This makes it wait
for the input to be actually read before returning, which is important for
tests. See :help feedkeys
for the other options.
Remember that test scripts a vim functions. I know that sounds obvious, but things like "insert mode completions" are hard to test with functions which are typically not invoked in insert mode. In order to actually do anything in insert mode, you need to do the following:
If you want TextChangedI
to fire,
call test_override( 'char_avail', 1)
Normally, feedkeys
would exit insert mode if you enter it. Tell it not to
by passing the !
flag.
Now that you've left Vim in insert mode, your test will hang forever unless
you exit insert mode, so define a function and call it via a timer
or other async callback which performs the actual asserts, and ends by
calling feedkeys( "\<ESC>" )
to exit insert mode.
Check completion.test.vim
for an example.
Remember that the assert*
functions don't throw exceptions. They return 0
on success, and return nonzero on failure, populating v:errors
.
Throwing exceptions in tests does fail the test, but this is not recommended because it skips the (local) teardown code.
If you're writing a test function, it needs to conform as follows:
v:errors
(e.g. call add(v:errors, 'test')
) will cause the
test to fail.0
on success and 1
on failure. This allows it to be used with
WaitForAssert
run_vim_tests
takes arguments of the form <test script>:<test function filter>
.
For example to just run the "MyOtherTest" test in the mytests.test.vim
:
$ run_vim_tests mytests.test.vim:MyOtherTest
The filter is a Vim regexp. The same script file can be listed multiple times, as in:
$ run_vim_tests 'mytests.test.vim:MyTest' 'mytests.test.vim:MyOtherTest'
The test suite supports covimerage
coverage testing. Just set the COVERAGE
environment variable when running run_vim_tests
.
This generates coverage for both the python code and the vimscript code.
For python, there is some initialisation code in run_test.vim
which starts up
coverage
and saves the result to .coverage.python
.
For vim script, we use covimerage
which takes the vim :profile
data (also
initialised in run_test.vim
) and converts it to coverage
-style data in
.coverage.vim
(this is done by run_vim_tests
after running all the tests).
Finally, we upload that data to codecov
. This combines .coverage.python
and
.coverage.vim
into .coverage
and uploads it.
To get a local summary:
pip install --user -r python/test_requirements.txt
COVERAGE=true ./test/run_vim_tests
coverage combine -a
coverage report
or coverage html
We generate and push 2 containers:
youcompleteme/ycm-vim-py3:test
and youcompleteme/ycm-vim-py3:manual
The :test
tags are the containers that are used by Azure pipelines to run the
tests and contains essentially Ubuntu LTS + the YCM dependencies and a build of
Vim at a specific version built with python3 (-py3
) support.
The :manual
tags extend the :test
tags with a user account that largely
matches the one created by Azure to run our tests. It also installs a basic
vimrc
so that you can do manual testing too.
To rebuild and push all of the containers:
cd test/docker
./rebuild_all
This script essentially runs ./rebuild
and ./push
in each of the ci
and
manual
directories (corresponding to the :test
and :manual
tags
respectively).
Those scripts are just simple wrappers for docker build
and docker push
because it's easy to forget the exact syntax.