Mink Extension
==============

You can use Behat to describe anything, that you can describe in business
logic. It’s tools, gui applications, web applications. Most interesting part
is web applications. First, behavioral testing already exists in web world -
it’s called functional or acceptance testing. Almost all popular frameworks
and languages provide functional testing tools. Today we’ll talk about how to
use Behat for functional testing of web applications. `Mink <http://mink.behat.org>`_
is a tool exactly for that and this extension provides integration for it.

Basically, MinkExtension is an integration layer between Behat 3.0+ and Mink 1.4+
and it provides:

* Additional services for Behat (``Mink``, ``Sessions``, ``Drivers``).
* ``Behat\MinkExtension\Context\MinkAwareContext`` which provides ``Mink``
  instance for your contexts.
* Base ``Behat\MinkExtension\Context\MinkContext`` context which provides base
  step definitions and hooks for your contexts or subcontexts. Or it could be
  even used as context on its own.

Installation
------------

This extension requires:

* Behat 3.0+
* Mink 1.4+

Through Composer
~~~~~~~~~~~~~~~~

The easiest way to keep your suite updated is to use `Composer <http://getcomposer.org>`_:

1. Install with composer:

    .. code-block:: bash

        $ composer require --dev behat/mink-extension

2. Activate extension by specifying its class in your ``behat.yml``:

    .. code-block:: yaml

        # behat.yml
        default:
          # ...
          extensions:
            Behat\MinkExtension:
              base_url:  'http://example.com'
              sessions:
                default:
                  goutte: ~

Usage
-----

After installing extension, there would be 6 usage options available for you:

1. Extending ``Behat\MinkExtension\Context\RawMinkContext`` in your feature suite.
   This will give you ability to use a preconfigured `Mink` instance altogether with some
   convenience methods:

   * ``getSession($name = null)``
   * ``assertSession($name = null)``

   ``RawMinkContext`` doesn't provide any hooks or definitions, so you can inherit from it
   in as many contexts as you want - you'll never get ``RedundantStepException``.

2. Extending ``Behat\MinkExtension\Context\MinkContext`` with one of your contexts.
   Exactly like the previous option, but also provides lots of predefined step definitions out
   of the box. As this context provides step definitions and hooks, you can use it **only once**
   inside your feature context tree.

    .. code-block:: php

        <?php

        use Behat\MinkExtension\Context\MinkContext;

        class FeatureContext extends MinkContext
        {
            /**
             * @Then /^I wait for the suggestion box to appear$/
             */
            public function iWaitForTheSuggestionBoxToAppear()
            {
                $this->getSession()->wait(5000, "$('.suggestions-results').children().length > 0");
            }
        }

    .. warning::

        Keep in mind, that you can not have multiple step definitions with the same regex.
        It will cause a ``RedundantException``. So, you can inherit from ``MinkContext``
        only with one of your context/subcontext classes.

3. Adding ``Behat\MinkExtension\Context\MinkContext`` as context in your suite.
   Exactly like previous option, but gives you the ability to keep your main context
   class clean.

    .. code-block:: yaml

        default:
          suites:
            my_suite:
              contexts:
                - FeatureContext
                - Behat\MinkExtension\Context\MinkContext

    .. note::

        Keep in mind, that you can not have multiple step definitions with the same regex.
        It will cause a ``RedundantException``. So, you can inherit from ``MinkContext``
        only with one of your context/subcontext classes.

4. Implementing ``Behat\MinkExtension\Context\MinkAwareContext`` with your context.

There are common things between these methods. In each of those, the target context will implement
``setMink(Mink $mink)`` and ``setMinkParameters(array $parameters)`` methods. Those methods would
be automatically called **immediately after** each context creation before each scenario. And
this ``$mink`` instance will be preconfigured based on the settings you've provided in your
``behat.yml``.

Configuration
-------------

MinkExtension comes with a flexible configuration system, that gives you
the ability to configure Mink inside Behat to fulfil all your needs.

Sessions
--------

You can register as many Mink sessions as you want. For each session, you
will need to choose the driver you want to use.

.. code-block:: yaml

    default:
        extensions:
            Behat\MinkExtension:
                sessions:
                    first_session:
                        selenium2: ~
                    second_session:
                        goutte: ~
                    third_session:
                        selenium2: ~

MinkExtension will set the default Mink session for each scenario based on
the configuration settings ``default_session`` and ``javascript_session``
and on scenario tags:

* A scenario tagged with ``@mink:foo`` will use ``foo`` as default session;
* A scenario tagged with ``@javascript`` will use the javascript session as default session;
* Other scenarios will use the default session.

The default session and the default javascript session can also be configured for
each suite:

.. code-block:: yaml

    default:
        suites:
            first:
                mink_session: foo
                mink_javascript_session: sahi

If it is not configured explicitly, the javascript session is set to the first
session using a javascript driver in the order of the configuration (it would
be ``first_session`` in the example above as ``selenium2`` supports Javascript).
If it is not configured explicitly, the default session is set to the first
session using a non-javascript driver if any, or to the first javascript session
otherwise (it would be ``second_session`` above as ``goutte`` does not support
javascript).

Drivers
~~~~~~~

First of all, there are drivers enabling configuration. MinkExtension comes
with support for 7 drivers out of the box:

* ``GoutteDriver`` - headless driver without JavaScript support. In order to use
  it, modify your ``behat.yml`` profile:

    .. code-block:: yaml

        default:
            extensions:
                Behat\MinkExtension:
                    sessions:
                        my_session:
                            goutte: ~

  .. Tips : HTTPS and self-signed certificate
  In case you use Behat/Mink/Goutte to test your application, and want to test an
  application secured with HTTPS, but with a self-signed certificate, you can use
  the following parameters to avoid the validation error triggered by Guzzle:

  * For ``Guzzle 4`` or later:
  
      .. code-block:: yaml

          default:
              extensions:
                  Behat\MinkExtension:
                      sessions:
                          my_session:
                              goutte:
                                  guzzle_parameters:
                                      verify: false
  
  * For ``Guzzle 3`` or earlier:
  
      .. code-block:: yaml

          default:
              extensions:
                  Behat\MinkExtension:
                      sessions:
                          my_session:
                              goutte:
                                  guzzle_parameters:
                                      ssl.certificate_authority: false

* ``Selenium2Driver`` - javascript driver. In order to use it, modify your
  ``behat.yml`` profile:

    .. code-block:: yaml

        default:
            extensions:
                Behat\MinkExtension:
                    sessions:
                        my_session:
                            selenium2: ~

* ``SauceLabsDriver`` - special flavor of the Selenium2Driver configured to use the
  selenium2 hosted installation of saucelabs.com. In order to use it, modify your
  ``behat.yml`` profile:

    .. code-block:: yaml

        default:
            extensions:
                Behat\MinkExtension:
                    sessions:
                        my_session:
                            sauce_labs: ~

* ``BrowserStackDriver`` - special flavor of the Selenium2Driver configured to use the
  selenium2 hosted installation of browserstack.com. In order to use it, modify your
  ``behat.yml`` profile:

    .. code-block:: yaml

        default:
            extensions:
                Behat\MinkExtension:
                    sessions:
                        my_session:
                            browser_stack: ~

* ``SeleniumDriver`` - javascript driver. In order to use it, modify your ``behat.yml``
  profile:

    .. code-block:: yaml

        default:
            extensions:
                Behat\MinkExtension:
                    sessions:
                        my_session:
                            selenium: ~

* ``SahiDriver`` - javascript driver. In order to use it, modify your ``behat.yml``
  profile:

    .. code-block:: yaml

        default:
            extensions:
                Behat\MinkExtension:
                    sessions:
                        my_session:
                            sahi: ~

* ``ZombieDriver`` - zombie.js javascript headless driver. In order to use it, modify
  your ``behat.yml`` profile:

    .. code-block:: yaml

        default:
            extensions:
                Behat\MinkExtension:
                    sessions:
                        default:
                            zombie:
                                # Specify the path to the node_modules directory.
                                node_modules_path: /usr/local/lib/node_modules/

.. note::

    The phar version of Mink comes bundled with all 5 drivers and you don't need to do
    anything except enabling them in order to use them.

    But if you're using Composer, you need to install drivers that you need first:

    - GoutteDriver - ``behat/mink-goutte-driver``
    - SeleniumDriver - ``behat/mink-selenium-driver``
    - Selenium2Driver (also used for SauceLabs and BrowserStack) - ``behat/mink-selenium2-driver``
    - SahiDriver - ``behat/mink-sahi-driver``
    - ZombieDriver - ``behat/mink-zombie-driver``

.. note::

    All drivers share the same API, which means that you could use multiple drivers
    for the same suite - which one fits your needs for concrete scenarios. Don't
    try to stick to a single driver as there's simply no universal solution - every
    driver has its pros and cons.

Additional Parameters
~~~~~~~~~~~~~~~~~~~~~

There's other useful parameters, that you can use to configure your suite:

* ``base_url`` - if you're using relative paths in your ``*.feature`` files
  (and you should), then this option will define which url to use as a basename
  for them.
* ``files_path`` - there's a special step definition for file upload inputs
  usage. You can use relative paths in those steps. ``files_path`` defines
  base path in which Mink should search those relative files.
* ``show_cmd`` - there's a special definition in MinkExtension, that saves
  currently opened page into temporary file and opens it with some browser
  utility (for debugging). This option defines command to be used for opening.
  For example: ``show_cmd: 'firefox %s'``.
* ``show_tmp_dir`` - the temporary folder used to show the opened page (defaults
  to the system temp dir)
* ``show_auto`` - Whether the opened page should be shown automatically when
  a step fails.
* ``browser_name`` - meta-option, that defines which browser to use for Sahi,
  Selenium and Selenium2 drivers.
* ``default_session`` - defines default session (driver) to be used for all
  untagged scenarios. Could be any enabled session name.
* ``javascript_session`` - defines javascript session (driver) (the one, which
  will be used for ``@javascript`` tagged scenarios). Could be any enabled session
  name.
* ``mink_loader`` - path to a file loaded to make Mink available (useful when
  using the PHAR archive for Mink, useless when using Composer)
