Mirakuru is a process orchestration tool designed for functional and integration tests.

Maybe you want to be able to start a database before you start your program or maybe you just need to set additional services up for your tests. This is where you should consider using mirakuru to add superpowers to your program or tests.

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In a project that relies on multiple processes there might be a need to guard code with tests that verify interprocess communication. So one needs to set up all of required databases, auxiliary and application services to verify their cooperation. Synchronising (or orchestrating) test procedure with tested processes might be a hell.

If so, then mirakuru is what you need.

Mirakuru starts your process and waits for the clear indication that it’s running. Library provides six executors to fit different cases:

  • SimpleExecutor - starts a process and does not wait for anything. It is useful to stop or kill a process and its subprocesses. Base class for all the rest of executors.
  • Executor - base class for executors verifying if a process has started.
  • OutputExecutor - waits for a specified output to be printed by a process.
  • TCPExecutor - waits for the ability to connect through TCP with a process.
  • HTTPExecutor - waits for a successful HEAD request (and TCP before).
  • PidExecutor - waits for a specified .pid file to exist.
from mirakuru import HTTPExecutor
from httplib import HTTPConnection, OK

def test_it_works():
    # The ``./http_server`` here launches some HTTP server on the 6543 port,
    # but naturally it is not immediate and takes a non-deterministic time:
    executor = HTTPExecutor("./http_server", url="")

    # Start the server and wait for it to run (blocking):
    # Here the server should be running!
    conn = HTTPConnection("", 6543)
    conn.request("GET", "/")
    assert conn.getresponse().status is OK

A command by which executor spawns a process can be defined by either string or list.

# command as string
TCPExecutor('python -m smtpd -n -c DebuggingServer localhost:1025', host='localhost', port=1025)
# command as list
    ['python', '-m', 'smtpd', '-n', '-c', 'DebuggingServer', 'localhost:1025'],
    host='localhost', port=1025


The project was firstly developed by Mateusz Lenik as the summon_process. Later forked, renamed into mirakuru and tended to by The A Room @ Clearcode and the other authors.


mirakuru is licensed under LGPL license, version 3.

Contributing and reporting bugs

Source code is available at: ClearcodeHQ/mirakuru. Issue tracker is located at GitHub Issues. Projects PyPI page.

When contributing, don’t forget to add your name to the AUTHORS.rst file.


Copyright (c) 2014 by Clearcode, mirakuru authors and contributors. See Authors

This module is part of mirakuru and is released under the LGPL license, version 3.