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Provides some testing helpers and an advanced MockTestCase.

Project Description
ftw.testing
===========


This package provides helpers for writing tests.

.. contents:: Table of Contents


IntegrationTesting
------------------

FTWIntegrationTesting layer
~~~~~~~~~~~~~~~~~~~~~~~~~~~

The ``FTWIntegrationTesting`` is an opinionated extension of Plone's
default integration testing layer.

The primary goal is to be able to run ``ftw.testbrowser``s traversal
driver with integration testing.

**Database isolation and transactions**

The Plone default integration testing layer does support transactions:
when changes are committed in tests, no isolation is provided
and the committed changes will apear in the next layer.

- We isolate between tests by making a savepoint in the test setup and
rolling back to the savepoint in test tear down.
- With a transaction interceptor we make sure that no code in the test
can commit or abort a transaction. Transactional behavior is simulated
by using savepoints.


**Usage example:**

.. code:: python

from ftw.testing import FTWIntegrationTesting
from plone.app.testing import PLONE_FIXTURE
from plone.app.testing import PloneSandboxLayer

class TestingLayer(PloneSandboxLayer):
defaultBases = (PLONE_FIXTURE,)


TESTING_FIXTURE = TestingLayer()
INTEGRATION_TESTING = FTWIntegrationTesting(
bases=(TESTING_FIXTURE,),
name='my.package:integration')



FTWIntegrationTestCase
~~~~~~~~~~~~~~~~~~~~~~

The integration test case is an test case base class providing sane defaults
and practical helpers for testing Plone addons with an ``FTWIntegrationTesting``
testing layer.

You may make your own base class in your package, setting the default testing
layer and extending the behavior and helpers for your needs.


**Usage example:**

.. code:: python

# my/package/tests/test_case.py
from ftw.testing import FTWIntegrationTestCase
from my.package.testing import INTEGRATION_TESTING

class IntegrationTestCase(FTWIntegrationTestCase):
layer = INTEGRATION_TESTING



MockTestCase
------------

``ftw.testing`` provides an advanced MockTestCase which provides bases on
the `plone.mocktestcase`_ ``MockTestCase``.

.. code:: python

from ftw.testing import MockTestCase


The following additional methods are available:

``self.providing_mock(interfaces, *args, **kwargs)``
Creates a mock which provides ``interfaces``.

``self.mock_interface(interface, provides=None, *args, **kwargs)``
Creates a mock object implementing ``interface``. The mock does not
only provide ``interface``, but also use it as specification and
asserts that the mocked methods do exist on the interface.

``self.stub(*args, **kwargs)``
Creates a stub. It acts like a mock but has no assertions.

``self.providing_stub(interfaces, *args, **kwargs)``
Creates a stub which provides ``interfaces``.

``self.stub_interface(interface, provides=None, *args, **kwargs)``
Does the same as ``mock_interface``, but disables counting of expected
method calls and attribute access. See "Mocking vs. stubbing" below.

``self.set_parent(context, parent_context)``
Stubs the ``context`` so that its acquisition parent is ``parent_context``.
Expects at least context to be a mock or a stub. Returns the ``context``.

``self.stub_request(interfaces=[], stub_response=True, content_type='text/html', status=200)``
Returns a request stub which can be used for rendering templates. With the
``stub_response`` option, you can define if the request should stub a
response by itself. The other optional arguments:
``content_type``: Defines the expected output content type of the response.
``status``: Defines the expected status code of the response.

``self.stub_response(request=None, content_type='text/html', status=200))``
Returns a stub response with some headers and options. When a ``request``
is given the response is also added to the given request.
The other optional arguments:
``content_type``: Defines the expected output content type of the response.
``status``: Defines the expected status code of the response.

``self.assertRaises(*args, **kwargs)``
Uses ``unittest2`` implementation of assertRaises instead of
``unittest`` implementation.

It also fixes a problem in ``mock_tool``, where the ``getToolByName`` mock
had assertions which is not very useful in some cases.


Mocking vs. stubbing
--------------------

A **mock** is used for testing the communication between two objects. It
asserts *method calls*. This is used when a test should not test if
a object has a specific state after doing something (e.g. it has it's
attribute *xy* set to something), but if the object *does* something
with another object. If for example an object `Foo` sends an email
when method `bar` is called, we could mock the sendmail object and
assert on the send-email method call.

On the other hand we often have to test the state of an object (attribute
values) after doing something. This can be done without mocks by just
calling the method and asserting the attribute values. But then we have
to set up an integration test and install plone, which takes very long.
For testing an object with dependencies to other parts of plone in a
unit test, we can use **stubs** for faking other (separately tested) parts
of plone. Stubs work like mocks: you can "expect" a method call and
define a result. The difference between **stubs** and **mocks** is that
stubs do not assert the expectations, so there will be no errors if
something expected does not happen. So when using stubs we can assert
the state without asserting the communcation between objects.


Component registry layer
------------------------

The ``MockTestCase`` is able to mock components (adapters, utilities). It
cleans up the component registry after every test.

But when we use a ZCML layer, loading the ZCML of the package it should use
the same component registry for all tests on the same layer. The
``ComponentRegistryLayer`` is a layer superclass for sharing the component
registry and speeding up tests.

Usage:

.. code:: python

from ftw.testing.layer import ComponentRegistryLayer

class ZCMLLayer(ComponentRegistryLayer):

def setUp(self):
super(ZCMLLayer, self).setUp()

import my.package
self.load_zcml_file('configure.zcml', my.package)

ZCML_LAYER = ZCMLLayer()

Be aware that ``ComponentRegistryLayer`` is a base class for creating your
own layer (by subclassing ``ComponentRegistryLayer``) and is not usable with
``defaultBases`` directly. This allows us to use the functions
``load_zcml_file`` and ``load_zcml_string``.


Mailing test helper
-------------------
The Mailing helper object mocks the mailhost and captures sent emails.
The emails can then be easily used for assertions.

Usage:

.. code:: python

from ftw.testing.mailing import Mailing
import transaction

class MyTest(TestCase):
layer = MY_FUNCTIONAL_TESTING

def setUp(self):
Mailing(self.layer['portal']).set_up()
transaction.commit()

def tearDown(self):
Mailing(self.layer['portal']).tear_down()

def test_mail_stuff(self):
portal = self.layer['portal']
do_send_email()
mail = Mailing(portal).pop()
self.assertEquals('Subject: ...', mail)


Freezing datetime.now()
-----------------------

When testing code which depends on the current time, it is necessary to set
the current time to a specific time. The ``freeze`` context manager makes that
really easy:

.. code:: python

from ftw.testing import freeze
from datetime import datetime

with freeze(datetime(2014, 5, 7, 12, 30)):
# test code

The ``freeze`` context manager patches the `datetime` module, the `time` module
and supports the Zope `DateTime` module. It removes the patches when exiting
the context manager.

**Updating the freezed time**

.. code:: python

from ftw.testing import freeze
from datetime import datetime

with freeze(datetime(2014, 5, 7, 12, 30)) as clock:
# its 2014, 5, 7, 12, 30
clock.forward(days=2)
# its 2014, 5, 9, 12, 30
clock.backward(minutes=15)
# its 2014, 5, 9, 12, 15

You can use the
`timedelta arguments`(https://docs.python.org/2/library/datetime.html#datetime.timedelta)_
for ``forward`` and ``backward``.



Static UUIDS
------------

When asserting UUIDs it can be annoying that they change at each test run.
The ``staticuid`` decorator helps to fix that by using static uuids which
are prefixed and counted within a scope, usually a test case:

.. code:: python

from ftw.testing import staticuid
from plone.app.testing import PLONE_INTEGRATION_TESTING
from unittest2 import TestCase

class MyTest(TestCase):
layer = PLONE_INTEGRATION_TESTING

@staticuid()
def test_all_the_things(self):
doc = self.portal.get(self.portal.invokeFactory('Document', 'the-document'))
self.assertEquals('testallthethings0000000000000001', IUUID(doc))

@staticuid('MyUIDS')
def test_a_prefix_can_be_set(self):
doc = self.portal.get(self.portal.invokeFactory('Document', 'the-document'))
self.assertEquals('MyUIDS00000000000000000000000001', IUUID(doc))



Generic Setup uninstall test
----------------------------

``ftw.testing`` provides a test superclass for testing uninstall profiles.
The test makes a Generic Setup snapshot before installing the package, then
installs and uninstalls the package, creates another snapshot and diffs it.
The package is installed without installing its dependencies, because it
should not include uninstalling dependencies in the uninstall profile.

Appropriate testing layer setup is included and the test runs on a seperate
layer which should not interfere with other tests.

Simple example:

.. code:: python

from ftw.testing.genericsetup import GenericSetupUninstallMixin
from ftw.testing.genericsetup import apply_generic_setup_layer
from unittest2 import TestCase


@apply_generic_setup_layer
class TestGenericSetupUninstall(TestCase, GenericSetupUninstallMixin):
package = 'my.package'


The ``my.package`` is expected to have a Generic Setup profile
``profile-my.package:default`` for installing the package and a
``profile-my.package:uninstall`` for uninstalling the package.
It is expected to use ``z3c.autoinclude`` entry points for loading
its ZCML.

The options are configured as class variables:

**package**
The dotted name of the package as string, which is used for things such
as guessing the Generic Setup profile names. This is mandatory.

**autoinclude** (``True``)
This makes the testing fixture load ZCML using the ``z3c.autoinclude``
entry points registered for the target ``plone``.

**additional_zcml_packages** (``()``)
Use this if needed ZCML is not loaded using the ``autoinclude`` option,
e.g. when you need to load testing zcml. Pass in an iterable of
dottednames of packages, which contain a ``configure.zcml``.

**additional_products** (``()``)
A list of additional Zope products to install.

**install_profile_name** (``default``)
The Generic Setup install profile name postfix.

**skip_files** (``()``)
An iterable of Generic Setup files (e.g. ``("viewlets.xml",)``) to be
ignored in the diff. This is sometimes necessary, because not all
components can and should be uninstalled properly. For example viewlet
orders cannot be removed using Generic Setup - but this is not a problem
they do no longer take effect when the viewlets / viewlet managers are
no longer registered.


Full example:

.. code:: python

from ftw.testing.genericsetup import GenericSetupUninstallMixin
from ftw.testing.genericsetup import apply_generic_setup_layer
from unittest2 import TestCase


@apply_generic_setup_layer
class TestGenericSetupUninstall(TestCase, GenericSetupUninstallMixin):
package = 'my.package'
autoinclude = False
additional_zcml_packages = ('my.package', 'my.package.tests')
additional_products = ('another.package', )
install_profile_name = 'default'
skip_files = ('viewlets.xml', 'rolemap.xml')


Disabling quickinstaller snapshots
----------------------------------

Quickinstaller normally makes a complete Generic Setup (GS) snapshot
before and after installing each GS profile, in order to be able to
uninstall the profile afterwards.

In tests we usually don't need this feature and want to disable it to
speed up tests.

The ``ftw.testing.quickinstaller`` module provides a patcher for
replacing the quickinstaller event handlers to skip creating snapshots.
Usually we want to do this early (when loading ``testing.py``), so that
all the tests are speeding up.
However, some tests which involve quickinstaller rely on having the
snapshots made (see previous section about uninstall tests).
Therefore the snapshot patcher object provides context managers for
temporarily enabling / disabling the snapshot feature.

Usage:

Disable snapshots early, so that everything is fast. Usually this is
done in the ``testing.py`` in module scope, so that it happens already
when the testrunner imports the tests:

.. code:: python

from ftw.testing.quickinstaller import snapshots
from plone.app.testing import PloneSandboxLayer

snapshots.disable()

class MyPackageLayer(PloneSandboxLayer):
...

When testing quickinstaller snapshot related things, such as uninstalling,
the snapshots can be re-enabled for a context manager or in general:

.. code:: python

from ftw.testing.quickinstaller import snapshots

snapshots.disable()
# snapshotting is now disabled

with snapshots.enabled():
# snapshotting is enabled only within this block

snapshots.enable()
# snapshotting is now enabled

with snapshots.disabled():
# snapshotting is disabled only within this block


Transaction interceptor
-----------------------

The ``TransactionInterceptor`` patches Zope's transaction manager in
order to prevent code from interacting with the transaction.

This can be used for example for making sure that no tests commit transactions
when they are running on an integration testing layer.

The interceptor needs to be installed manually with ``install()`` and removed
at the end with ``uninstall()``. It is the users responsibility to ensure
proper uninstallation.

When the interceptor is installed, it is not yet active and passes through all
calls.
The intercepting begins with ``intercept()`` and ends when ``clear()`` is
called.

.. code:: python

from ftw.testing import TransactionInterceptor

interceptor = TransactionInterceptor().install()
try:
interceptor.intercept(interceptor.BEGIN | interceptor.COMMIT
| interceptor.ABORT)
# ...
interceptor.clear()
transaction.abort()
finally:
interceptor.uninstall()


Testing Layers
--------------

Component registry isolation layer
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

``plone.app.testing``'s default testing layers (such as ``PLONE_FIXTURE``) do not
isolate the component registry for each test.

``ftw.testing``'s ``COMPONENT_REGISTRY_ISOLATION`` testing layer isolates the
component registry for each test, provides a stacked ZCML configuration context
and provides the methods ``load_zcml_string`` and ``load_zcml_file`` for loading
ZCML.

Example:

.. code:: python

# testing.py
from ftw.testing.layer import COMPONENT_REGISTRY_ISOLATION
from plone.app.testing import IntegrationTesting
from plone.app.testing import PloneSandboxLayer
from zope.configuration import xmlconfig


class MyPackageLayer(PloneSandboxLayer):
defaultBases = (COMPONENT_REGISTRY_ISOLATION,)

def setUpZope(self, app, configurationContext):
import my.package
xmlconfig.file('configure.zcml', ftw.package,
context=configurationContext)

MY_PACKAGE_FIXTURE = MyPackageLayer()
MY_PACKAGE_INTEGRATION = IntegrationTesting(
bases=(MY_PACKAGE_FIXTURE,
COMPONENT_REGISTRY_ISOLATION),
name='my.package:integration')


# ----------------------------
# test_*.py
from unittest2 import TestCase

class TestSomething(TestCase):
layer = MY_PACKAGE_INTEGRATION

def test(self):
self.layer['load_zcml_string']('<configure>...</configure>')


Temp directory layer
~~~~~~~~~~~~~~~~~~~~

The ``TEMP_DIRECTORY`` testing layer creates an empty temp directory for
each test and removes it recursively on tear down.

The path to the directory can be accessed with the ``temp_directory`` key.

Usage example:

.. code:: python

from unittest2 import TestCase
from ftw.testing.layer import TEMP_DIRECTORY


class TestSomething(TestCase):
layer = TEMP_DIRECTORY

def test(self):
path = self.layer['temp_directory']


Console script testing layer
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The console script layer helps testing console scripts.
On layer setup it creates and executes an isolated buildout with the package under
development, which creates all console scripts of this package.
This makes it easy to test console scripts by really executing them.

Usage example:

.. code:: python

# testing.py
from ftw.testing.layer import ConsoleScriptLayer

CONSOLE_SCRIPT_TESTING = ConsoleScriptLayer('my.package')


# test_*.py
from my.package.testing import CONSOLE_SCRIPT_TESTING
from unittest2 import TestCase


class TestConsoleScripts(TestCase):
layer = CONSOLE_SCRIPT_TESTING

def test_executing_command(self):
exitcode, output = self.layer['execute_script']('my-command args')
self.assertEqual('something\n', output)

Be aware that the dependency ``zc.recipe.egg`` is required for building the
console scripts. You may put the dependency into your ``tests`` extras require.


Compatibility
-------------

Runs with `Plone <http://www.plone.org/>`_ `4.2` or `4.3`.


Links
-----

- Github: https://github.com/4teamwork/ftw.testing
- Issues: https://github.com/4teamwork/ftw.testing/issues
- Pypi: http://pypi.python.org/pypi/ftw.testing
- Continuous integration: https://jenkins.4teamwork.ch/search?q=ftw.testing


Copyright
---------

This package is copyright by `4teamwork <http://www.4teamwork.ch/>`_.

``ftw.testing`` is licensed under GNU General Public License, version 2.





.. _plone.mocktestcase: http://pypi.python.org/pypi/plone.mocktestcase
.. _Splinter: https://pypi.python.org/pypi/splinter

Changelog
=========


1.17.0 (2017-10-02)
-------------------

- Add ``FTWIntegrationTesting`` and ``FTWIntegrationTestCase``. [jone]

1.16.0 (2017-08-08)
-------------------

- Support Plone 5.1 for ConsoleScriptLayer. [jone]

1.15.2 (2017-07-18)
-------------------

- Freezer: keep timezone info when moving clock forward / backward. [jone]
- Freezer: Fix DST-bug in today() and time(). [jone]


1.15.1 (2017-07-04)
-------------------

- Fix savepoint simulation to cleanup savepoints. [jone]


1.15.0 (2017-07-03)
-------------------

- Add savepoint simulation to transaction interceptor. [jone]


1.14.0 (2017-06-23)
-------------------

- Do not require "Plone" egg. [jone]


1.13.0 (2017-06-20)
-------------------

- Add transaction interceptor. [jone]


1.12.0 (2017-06-19)
-------------------

- Support Plone 5.1 [mathias.leimgruber, jone]
- Remove splinter browser. Use ftw.testbrowser instead. [mathias.leimgruber, jone]
- Drop Plone 4.1 support. [jone]


1.11.0 (2016-03-31)
-------------------

- Freezer: reimplement "now" patching with forbiddenfruit.
This fixes problems with pickling and comparison of frozen datetime objects.
[jone]


1.10.3 (2015-10-11)
-------------------

- Freezer: disable freezing while committing to database for preventing pickling errors.
[jone]

- Freezer bugfix: replace datetime instances when leaving freeze context manager.
[jone]


1.10.2 (2015-07-30)
-------------------

- Added timezone(`tz`) support for "freeze".
[phgross]


1.10.1 (2015-07-27)
-------------------

- Use "now" as default of "freeze".
[jone]


1.10.0 (2015-05-18)
-------------------

- Update the freezed time with ``forward`` and ``backward``.
[jone]


1.9.1 (2015-05-15)
------------------

- Fix site hook within ``staticuid`` decorated methods.
[jone]


1.9.0 (2015-05-15)
------------------

- Add ``staticuid`` decorator for having static uids.
[jone]


1.8.1 (2015-01-05)
------------------

- Declare missing dependency to p.a.testing
required by the COMPONENT_REGISTRY_ISOLATION layer.
[jone]


1.8.0 (2014-12-31)
------------------

- Implement console script testing layer.
[jone]

- Implement TEMP_DIRECTORY testing layer.
[jone]

- Implement COMPONENT_REGISTRY_ISOLATION layer.
[jone]


1.7.0 (2014-09-30)
------------------

- Add patcher for disabling quickinstaller snappshotting in tests.
[jone]


1.6.4 (2014-05-01)
------------------

- Generic Setup uninstall test: Add a second test that uses Portal Setup for
uninstallation. This makes sure that Portal Setup uninstallation behaves the same as
quickinstaller uninstallation.
[deif]


1.6.3 (2014-04-30)
------------------

- Generic Setup uninstall test: Remove is_product option, since we
require an uninstall external method which requires the package
to be a product anyway.
[jone]

- Generic Setup uninstall test: test that there is an uninstall external method.
Uninstall external methods are still necessary today for properly uninstalling
a package.
[jone]


1.6.2 (2014-04-30)
------------------

- Generic Setup test: use quickinstaller for uninstalling.
[jone]


1.6.1 (2014-04-29)
------------------

- Also install profile dependencies before creating a snapshot.
[deif]


1.6.0 (2014-04-29)
------------------

- Implement Generic Setup uninstall base test.
[jone]


1.5.2 (2014-02-09)
------------------

- Fix ``isinstance`` calls of freezed time in ``freeze`` context manager.
[jone]


1.5.1 (2014-02-08)
------------------

- Implement ``freeze`` context manager for freezing the time.
[jone]


1.5.0 (2013-09-24)
------------------

- AT form page object: add schemata helper methods for testing visible
schematas and fields.
[jone]


1.4 (2013-08-26)
----------------

- Add custom mailhost class, remembering the sender and recipient
of each email separately.
[deif]

- Deprecate @javascript because Selenium with PhantomJS is too unstable.
Removes tests and documentation, the @javascript decorator still works
for now but needs to be imported from ftw.testing.browser.
[jone]

- Page objects: add a Plone.visit(obj) function.
[jone]

- Fix a rare bug where the MockMailHost message list has been replaced by
another instance.
[jone, deif]


1.3.1 (2013-05-24)
------------------

- Move ``Mailing`` helper class to its own module ``mailing``.
[deif]


1.3 (2013-05-03)
----------------

- Drop official Plone 4.0 support.
[jone]

- Component registry layer: use isolated ZCML layers.
When using the same layer instances it may conflict with integration or
functional testing layers.
[jone]

- Add splinter integration and Plone page objects.
[jone]

- onegov.ch approved: add badge to readme.
[jone]

- MockTestCase: Support Products.PloneHotfix20121106 patch when mocking getToolByName.
[jone]

- MockTestCase: add checks that setUp is called correctly.
[jone]


1.2 (2012-05-22)
----------------

- Add ``stub_reponse`` method to ``MockTestCase`` and adjust the
``stub_request`` method accordant.
[phgross]

- Made providing interfaces configurable for the ``stub_request`` method.
[phgross]

- Let the stub_request method also stub the getStatus of the response.
[phgross]

- Add ``stub_request`` method to ``MockTestCase``.
[jone]

- No longer tear down the component registry in mock test case. Use the
ComponentRegistryLayer.
[jone]

- Add ``ComponentRegistryLayer`` base class.
[jone]

- Add ``mock_interface`` and ``stub_interface`` methods to MockTestCase, creating
a mock and using the interface as spec.
[jone]

- Accept also interfaces directly rather than lists of interfaces when
creating mocks or stubs which provides the interfaces.
[jone]


1.1 (2011-11-16)
----------------

- Patch mock_tool: do not count, so that it can be used multiple times.
[jone]


1.0 (2011-10-12)
----------------

- Initial release
Release History

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