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A simple way of running your tests (with py.test) from within VIM.
Talking with Holger Krekel (original author of py.test and vim user) we thought it would be neat to be able to call it from vim and get some immediate results.
This is especially useful when you are tweaking and do not want to be moving around between the terminal and your vim session.
- Screencast: http://vimeo.com/19774046
This plugin is a file type plugin, which means that it is only enabled when
the matching file type (Python in this case) is being edited. To ensure the
plugin works correctly, the following setting must be enabled (usually in
.vimrc):
filetype on
Without any install frameworks, all is needed is to drop the pytest.vim
file in one of the Vim runtime paths, in the subdirectory ftplugin/python/
If using vim-pathogen the whole repository can be placed in
.vim/bundle. Otherwise please follow the guidelines of the package manager
of choice.
This plugin provides a single command:
Pytest
All arguments are able to be tab-completed. To ensure the plugin will be loaded, these settings must be enabled:
:set filetype on :set filetype plugin on
For running tests the plugin provides 4 arguments with an optional one. These arguments are:
class method function file project
As you may expect, those will focus on the tests for the current class, method, function, the file or project.
If you are in a class and want to run all the tests for that class, you would call this plugin like:
:Pytest class
Whenever a command is triggered a small message displays informing you that the plugin is running a certain action. In the above call, you would see something like this:
Running tests for class TestMyClass
If you would like to see the complete py.test output you can add an optional verbose flag to any of the commands for Pytest. For the previous command, it would look like:
:Pytest class verbose
This would open a split scratch buffer that you can fully interact with. You can close this buffer with ':wq' or you can hit 'q' at any moment in that buffer to close it.
When tests are successful a green bar appears. If you have any number of fails you get a red bar with a line-by-line list of line numbers and errors.
I strongly encourage a mapping for the above actions. For example, if you wanted leader (the leader key is '' by default) mappings you would probably do them like this:
" Pytest nmap <silent><Leader>f <Esc>:Pytest file<CR> nmap <silent><Leader>c <Esc>:Pytest class<CR> nmap <silent><Leader>m <Esc>:Pytest method<CR>
If you are working on a project, this plugin provides a way to run tests from anywhere within the project tree like this:
" Tests are in /path/to/project/tests/ " Working on /path/to/project/module/file.py :Pytest project
This would run all of the project tests (in /path/to/project/tests/) related to the active project. This works with a directory called "tests" or a file called "tests.py". It should be noted that this plugin searches upward through the directory tree, taking the first entry it finds. For example:
" Working on /home/project/file.py /home/tests/ " This set of tests will not be run /home/project/tests/ " This set of tests will be run
It is easy to check which set of tests will be run (the project test working directory):
:Pytest projecttestwd
This plugin also provides a way to jump to the actual error. Since errors can be living in a file other than your test (e.g. a syntax error in your source that triggers an assertion errro in the current file) you can also jump to that file. The list of jumping-to-error arguments are:
first last next previous end
Pytest DOES NOT JUMP AUTOMATICALLY to errors. You have to call the action. When you call a jump, a split buffer is opened with a file (if it is not the same as the one you are currently editing) and places you in the same line number were the error was reported.
If an error starts in the current file but ends on a different one, you can
call that end of error by calling :Pytest end.
Finally, you can also display in a split scratch buffer either the last list
of failed tests (with line numbers, errors and paths) or the last py.test
session (similar to what you would see in a terminal). The arguments that
you would need to provide for such actions are:
session fails
session is the buffer with a similar output to the terminal (but with
syntax highlighting) and fails has the list of last fails with the
exceptions.
If you are looking for the actual error, we have stripped it from the normal reporting but you can call it at any time with:
:Pytest error
The reason behind this is that as soon as you hit any key, the quick display goes away. With a split buffer you are in control and you can quit that window when you decide - while you work on fixing errors.
The commands that open the last session and the last fails are toggable: they will close the scratch buffer if it is open or will open it if its closed.
If you have ever needed to get into a pdb session and debug your code, you already know that it is a horrible experience to be jumping between Vim and the terminal. pytest.vim now includes a way of calling it with 2 options that will let you drop to a shell (inside Vim!) and control your pdb session.
py.test pdb on fail
Use this option when you need to use the built-in pdb support from py.test (e.g. drop to pdb when a test fails).
:Pytest class --pdb
The above command shows class but you can use this with all the objects supported (class, method , function and file).
py.test no capture
If you are placing import pdb; pdb.set_trace() somewhere in your code and you want to drop to pdb when that code gets executed, then you need to pass in the no-capture flag:
:Pytest class -s
Again the above command shows class but you can use this with all the objects
supported (class, method, function and file).
This plugin provides a way to have a better shell experience when running
verbose or pdb flags by using native Vim (only available with Vim 8 and
newer).
This is an extra option that will allow you to loop (run again) on fail. If the test fails, then this option will make Vim run the same test again as soon as the file is written.
Once the test passes, it will no longer re-run the tests again. This option is
available for class, method, function and file.
You would call it like:
:Pytest method looponfail
If for some reason you need to reset and clear all global variables that affect the plugin you can do so by running the following command:
:Pytest clear
This is specifically useful when looponfail has been enabled and you want to
stop its automatic behavior. Remember that looponfail will run every time you
write the buffer and will keep doing so unless your test passes.
Now when the Failed Error list is open and it as focus (cursor is currently in
that window) you can move to the next or previous failed test line by using the
arrow keys, j/k or Ctrl-n / Ctrl-p
Whenever you hit the bottom or the top of the list, you can loop around it!
If you hit an error that displays not the previous window (e.g. your test file) then a message will state that it is skipping.
There is full support for neovim. Tests will never block and will be
completely asynchronous. When the test run ends the familiar green (or red) bar
will be displayed.
Some changes where made as well to support interactive terminal sessions (when
using -s and --pdb for example) to make use of the terminal support
from neovim.
warning: When calling a test, the user needs to wait until that test ends before calling another test, otherwise, the plugin will kill the first in order to call the last one.
By default, the plugin uses py.test as the executable to run tests. Some
Linux distros mangle the name to provide both Python 3 and Python 2 variants
which forces one to pick a different name for the executable.
This can be customized with either the filename of the executable or the path
to the executable needed. For example, for a py.test-3 name, it could be
set in this way:
let g:pytest_executable = "py.test-3"
By default the project test directory is tests (i.e. test files are assumed
to be in /path/to/project/test). The global variable pytest_test_dir may
be used to change this, for example:
let g:pytest_test_dir = 'test_suite'
configures the test directory to be /path/to/project/test_suite
By default the test file is tests.py.The global variable
pytest_test_file may be used to change this, for example:
let g:pytest_test_file = 'test_myproj.py'
configures the test file to be /path/to/project/tests/test_myproj.py
(assuming the default value for the project test directory)
MIT Copyright (c) 2011-2015 Alfredo Deza <alfredo [at] deza [dot] pe>
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