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Process executor for tests.

Project description


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.



  • [fix] modify MANIFEST to prune tests folder
  • [feature] HTTPExecutor will now set the default 80 if not present in url
  • [feature] Detect subprocesses exiting erroneously while polling the checks and error early.
  • [fix] make test_forgotten_stop pass by preventing the shell from optimizing forking out


  • Corrected code to conform with W503, D210 and E402 linters errors as reported by pylama 6.3.1
  • [feature] introduces a hack that kills all subprocesses of executor process. It requires ‘ps xe -ww’ command being available in OS otherwise logs error.
  • [refactoring] Classes name convention change. Executor class got renamed into SimpleExecutor and StartCheckExecutor class got renamed into Executor.


  • [feature] ability to set up custom signal for stopping and killing processes managed by executors
  • [feature] replaced explicit parameters with keywords for kwargs handled by basic Executor init method
  • [feature] Executor now accepts both list and string as a command
  • [fix] even it’s not recommended to import all but from mirakuru import * didn’t worked. Now it’s fixed.
  • [tests] increased tests coverage.
    Even test cover 100% of code it doesn’t mean they cover 100% of use cases!
  • [code quality] increased Pylint code evaluation.


  • [feature] PidExecutor that waits for specified file to be created.
  • PyPy compatibility
  • [fix] closing all resources explicitly


  • [fix] - kill all children processes of Executor started with shell=True
  • [feature] executors are now context managers - to start executors for given context
  • [feature] Executor.stopped - context manager for stopping executors for given context
  • [feature] HTTPExecutor and TCPExecutor before .start() check whether port is already used by other processes and raise AlreadyRunning if detects it
  • moved python version conditional imports into module


  • fix issue where setting shell to True would execute only part of the command.


  • fix issue where OutputExecutor would hang, if started process stopped producing output


  • [fix] removed leftover sleep from TCPExecutor._wait_for_connection


  • fixed
  • updated packaging options


  • exposed process attribute on Executor
  • exposed port and host on TCPExecutor
  • exposed url on HTTPExecutor
  • simplified package structure
  • simplified executors operating API
  • updated documentation
  • added docblocks for every function
  • applied license headers
  • stripped orchestrators
  • forked off from summon_process

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