This tests pagematch, which tests whether a request/response matches a <match> tag.

    >>> from deliverance.pagematch import Match
    >>> from lxml.etree import XML
    >>> from webob import Request, Response
    >>> from webob.headerdict import HeaderDict
    >>> from deliverance.log import SavingLogger
    >>> def make(xml):
    ...     el = XML(xml)
    ...     return Match.parse_xml(el, source_location=None)
    >>> def match(matcher, request, resp, response_headers, show_log=True):
    ...     if isinstance(matcher, basestring):
    ...         matcher = make(matcher)
    ...     log = SavingLogger(None, None)
    ...     if isinstance(response_headers, list):
    ...         response_headers = HeaderDict(response_headers)
    ...     result = matcher(request, resp, response_headers, log)
    ...     if show_log:
    ...         for level, rule, message in log.messages:
    ...             print 'log:', message
    ...     return result

If you don't provide a class attribute, it is an error:

    >>> make('<match path="foo" />')
    Traceback (most recent call last):
        ...
    DeliveranceSyntaxError: You must provide some classes in the class attribute

Matches get normalized:

    >>> print make('<match path="/foo" last="0" class="  a b"/>')
    <match class="a b" path="path:/foo/" />

Now, some matches:

    >>> m = make('<match path="/foo" class="a" />')
    >>> match(m, Request.blank('/foo'), Response(), [])
    ['a']
    >>> match(m, Request.blank('/foobar'), Response(), [])
    log: Skipping class="a" because request URL (/foobar) does not match path="path:/foo/"
    False
    >>> match(m, Request.blank('/foo/bar'), Response(), [])
    ['a']
    >>> m = make('<match response-header="Content-Type: contains: html" class="x" />')
    >>> match(m, Request.blank('/'), Response(content_type='text/plain'), [('content-type', 'text/plain')])
    log: Skipping class="x" because the response headers Content-Type: text/plain do not match response-header="Content-Type: contains:html"
    False
    >>> match(m, Request.blank('/'), Response(content_type='text/html'), [('content-type', 'text/html')])
    ['x']
    >>> print m
    <match class="x" response-header="Content-Type: contains:html" />