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pytest plugin to check pinned requirements

Project description


This plugin checks your requirements files for specific versions, and compares those versions with the installed libraries in your environment, failing your test suite if any are invalid or out of date.

This is useful for keeping virtual environments up-to-date, and ensuring that your test suite is always being passed with the requirements you have specified.

It also has the added bonus of verifying that your requirements files are syntatically valid, and can check if there are new releases of your dependencies available.


install via:

pip install pytest-reqs

if you then type:

py.test --reqs

by default it will search for dependencies in the files matching:

  • req*.txt

  • req*.pip

  • requirements/*.txt

  • requirements/*.pip

and the declared dependencies will be checked against the current environment.

A little example

If your environment has dependencies installed like this:

$ pip freeze

But you have a requirements.txt file like this:

$ cat requirements.txt

you can run py.test with the plugin installed:

$ py.test --reqs
=================================== FAILURES ===================================
______________________________ requirements-check ______________________________
Distribution "foo" requires foo==1.0.0 (from -r requirements.txt (line 1)) but
0.9.9 is installed

It also handles pip’s version containment syntax (e.g, foo<=1.0.0, foo>=1.0.0, etc):

$ py.test --reqs
=================================== FAILURES ===================================
______________________________ requirements-check ______________________________
Distribution "foo" requires foo>=1.0.0 (from -r requirements.txt (line 1)) but
0.9.9 is installed

Furthermore, it will tell you if your requirements file is invalid (for example, if there is not enough = symbols):

$ py.test --reqs
______________________________ requirements-check ______________________________
Invalid requirement: 'foo=1.0.0' (from -r requirements.txt)

Configuring options

Ignoring local projects

You might have requirements files with paths to local projects, e.g. for local development:

$ cat requirements/local_development.txt
-e ../foo

However, testing these requirements will fail if the test environment is missing the local project (e.g., on a CI build):

=================================== FAILURES ===================================
______________________________ requirements-check ______________________________
../foo should either be a path to a local project or a VCS url beginning with
svn+, git+, hg+, or bzr+ (from -r requirements.txt)

To get around this, you can disable checking for local projects with the following pytest option:

# content of setup.cfg
reqsignorelocal = True

Declaring your own filename patterns

You might have requirements files in files other than the default filename patterns:

  • req*.txt

  • req*.pip

  • requirements/*.txt

  • requirements/*.pip

While there aren’t any restrictions on what filenames are or are not valid for requirements files, the patterns which are currently supported by pytest-reqs are the same common patterns supported by other automated tools around requirements files.

However, you can override these default patterns with the following pytest option:

# content of setup.cfg
reqsfilenamepatterns =

Running pytest-reqs before any other tests

Currently there is no way to define the order of pytest plugins (see pytest-dev/pytest#935)

This means that if you don’t use any other plugins, pytest-reqs will run it’s tests last. If you do use other plugins, there is no way to guarantee when the pytest-reqs tests will be run.

If you absolutely need to run pytest-reqs before any other tests and plugins, instead of using the --reqs flag, you can define a tests/ file as follows:

from pytest_reqs import check_requirements

def pytest_collection_modifyitems(config, session, items):
    check_requirements(config, session, items)

Running requirements checks and no other tests

You can also restrict your test run to only perform “reqs” tests and not any other tests by typing:

py.test --reqs -m reqs

This will only run test items with the “reqs” marker which this plugin adds dynamically.

Checking for out-of-date dependencies

You can use the --reqs-outdated flag to determine if any of your dependencies are out-of-date:

$ py.test --reqs-outdated
______________________________ requirements-check ______________________________
Distribution "foo" is outdated (from -r requirements.txt (line 1)),
latest version is foo==1.0.1

This feature is only available with pip>=9.0.0.



Open source MIT license.


The repository of this plugin is at

For more info on py.test see

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