Extensions for zope.testbrowser
Project description
Extensions for the Zope 3 testbrowser
This package is intended to provide extended versions of the Zope 3 testbrowser. Especially those extensions that introduce dependencies to more external products, like lxml.
Extension: lxml-support
All HTML pages are parsed and provided as an element-tree.
Extended testbrowser
This package provides some extensions to Zope 3’s testbrowser. It is intended for extensions that have dependencies that we do not want to rely on in the Zope 3 core e.g. lxml.
Requirements
lxml
etree support
The extended test browser allows parsing of the result of a request into an etree using lxml (if the content type is text/html or text/xml).
This is useful to perform more detailed analysis of web pages using e.g. XPath and related XML technologies.
Example:
>>> from z3c.etestbrowser.testing import ExtendedTestBrowser
>>> browser = ExtendedTestBrowser()
>>> browser.open("http://localhost/")
>>> print browser.contents
<!DOCTYPE ...>
...
</html>
>>> browser.etree
<Element html at ...>
>>> browser.etree.xpath('//body')
[<Element body at ...>]
Strict XML
It is possible to force the test browser to use the xml parser:
>>> browser.xml_strict
False
>>> browser.xml_strict = True
>>> browser.open("http://localhost/")
>>> browser.etree
<Element {http://www.w3.org/1999/xhtml}html at ...>
>>> browser.etree.xpath(
... '//html:body', namespaces={'html': 'http://www.w3.org/1999/xhtml'})
[<Element {http://www.w3.org/1999/xhtml}body at ...>]
LXML unicode support
A couple of variations of libxml2 might interpret UTF-8 encoded strings incorrectly. We have a workaround for that. Let’s have a look at a view that contains a German umlaut:
>>> browser.xml_strict = False
>>> browser.open('http://localhost/lxml.html')
>>> browser.etree.xpath("//span")[0].text
u'K\xfcgelblitz.'
Invalid XML/HTML responses
Responses that contain a body with invalid XML/HTML will cause an error when accessing the etree or normalized_contents attribute, but will load fine for general TestBrowser use:
>>> browser.open("http://localhost/empty.html")
>>> browser.contents
''
>>> browser.etree
Traceback (most recent call last):
XMLSyntaxError: ...
>>> browser.normalized_contents
Traceback (most recent call last):
XMLSyntaxError: ...
Pretty printing
Sometimes a normal print of the browsers contents is hard to read for debugging:
>>> browser.open('http://localhost/')
>>> print browser.contents
<!DOCTYPE html ...
...Name...Title...Created...Modified...
The extended test browser provides a method to provide a formatted version of the HTML (using htmllib internally):
>>> browser.pretty_print() @import url(http://localhost/@@/zope3_tablelayout.css); User: Fallback unauthenticated principal [Login][1] (image)[2] Location:...[top][3] / Navigation Loading... ... Name Title Created Modified ...
HTML/XML normalization
The extended test browser allows normalized output of HTML and XML which makes testing examples with HTML or XML a bit easier when unimportant details like whitespace are changing:
>>> browser.open('http://localhost/funny.html')
>>> print browser.contents
<html>
<head>
<title>Foo</title>
</head>
<body>
<h1>
Title
</h1>
</body>
</html>
<BLANKLINE>
versus
>>> print browser.normalized_contents
<html>
<head>
<title>Foo</title>
</head>
<body>
<h1>
Title
</h1>
</body>
</html>
CHANGES
1.3.1 (2010-01-18)
Added doctest to long_description to show up on pypi.
1.3.0 (2009-07-23)
Updgraded pacakge to lxml 2.2.
Fixed bug with normalized_contents which would break the open function of test browser if content wasn’t parsable as HTML/XML.
1.2.0 (2008-05-29)
Added normalized_contents attribute that reindents and normalizes the etree structure of a document and allows easier to read HTML/XML examples in doctests.
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