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 Dealing with faulty comment links
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Make sure that calling specially crafted URLs doesn't break the conversation
view. 

See also https://dev.plone.org/ticket/13327


Setting up and logging in
=========================

First we have to set up some things and login.

    >>> app = layer['app']
    >>> from plone.testing.z2 import Browser
    >>> browser = Browser(app)
    >>> browser.addHeader('Authorization', 'Basic admin:secret')
    >>> portal = layer['portal']
    >>> portal_url = 'http://nohost/plone'

As we're expecting to see 404s, the test should not break on HTTP errors.

    >>> browser.raiseHttpErrors = False

Enable commenting.

    >>> from zope.component import queryUtility
    >>> from plone.registry.interfaces import IRegistry
    >>> from plone.app.discussion.interfaces import IDiscussionSettings
    >>> registry = queryUtility(IRegistry)
    >>> settings = registry.forInterface(IDiscussionSettings)
    >>> settings.globally_enabled = True

Create a public page with comments allowed.

    >>> browser.open(portal_url)
    >>> browser.getLink(id='document').click()
    >>> browser.getControl(name='title').value = "Doc1"
    >>> browser.getControl(name='allowDiscussion:boolean').value = True
    >>> browser.getControl(name='form.button.save').click()
    >>> urldoc1 = browser.url

Check that the form has been properly submitted

    >>> browser.url
    'http://nohost/plone/doc1'


Checking invalid comment links
==============================

URL has invalid comment id
--------------------------

Test a URL with a comment id that cannot be converted to long integer.

    >>> url_invalid_comment_id = "%s/++conversation++default/ThisCantBeRight" % urldoc1
    >>> browser.open(url_invalid_comment_id)

We should not get an error,

    >>> "500 Internal Server Error" in str(browser.headers)
    False

but we should get a 404:

    >>> "404 Not Found" in str(browser.headers)
    True