NAME¶
Test::XML::XPath - Test XPath assertions
SYNOPSIS¶
use Test::XML::XPath tests => 3;
like_xpath( '<foo />', '/foo' ); # PASS
like_xpath( '<foo />', '/bar' ); # FAIL
unlike_xpath( '<foo />', '/bar' ); # PASS
is_xpath( '<foo>bar</foo>', '/foo', 'bar' ); # PASS
is_xpath( '<foo>bar</foo>', '/bar', 'foo' ); # FAIL
# More interesting examples of xpath assertions.
my $xml = '<foo attrib="1"><bish><bosh args="42">pub</bosh></bish></foo>';
# Do testing for attributes.
like_xpath( $xml, '/foo[@attrib="1"]' ); # PASS
# Find an element anywhere in the document.
like_xpath( $xml, '//bosh' ); # PASS
# Both.
like_xpath( $xml, '//bosh[@args="42"]' ); # PASS
DESCRIPTION¶
This module allows you to assert statements about your XML in the form of XPath
statements. You can say that a piece of XML must contain certain tags, with
so-and-so attributes, etc. It will try to use any installed XPath module that
it knows about. Currently, this means XML::LibXML and XML::XPath, in that
order.
NB: Normally in XPath processing, the statement occurs from a
context node. In the case of
like_xpath(), the context node will
always be the root node. In practice, this means that these two statements are
identical:
# Absolute path.
like_xpath( '<foo/>', '/foo' );
# Path relative to root.
like_xpath( '<foo/>', 'foo' );
It's probably best to use absolute paths everywhere in order to keep things
simple.
NB: Beware of specifying attributes. Because they use an @-sign, perl
will complain about trying to interpolate arrays if you don't escape them or
use single quotes.
FUNCTIONS¶
- like_xpath ( XML, XPATH [, NAME ] )
- Assert that XML (a string containing XML) matches the
statement XPATH. NAME is the name of the test.
Returns true or false depending upon test success.
- unlike_xpath ( XML, XPATH [, NAME ] )
- This is the reverse of like_xpath(). The test will
only pass if XPATH does not generates any matches in XML.
Returns true or false depending upon test success.
- is_xpath ( XML, XPATH, EXPECTED [, NAME ] )
- Evaluates XPATH against XML, and pass the test if the is
EXPECTED. Uses findvalue() internally.
Returns true or false depending upon test success.
- set_xpath_processor ( CLASS )
- Set the class name of the XPath processor used. It is up to
you to ensure that this class is loaded.
In all cases, XML must be well formed, or the test will fail.
SEE ALSO¶
Test::XML.
XML::XPath, which is the basis for this module.
If you are not conversant with XPath, there are many tutorials available on the
web. Google will point you at them. The first one that I saw was:
<
http://www.zvon.org/xxl/XPathTutorial/>, which appears to offer
interactive XPath as well as the tutorials.
AUTHOR¶
Dominic Mitchell <cpan2 (at) semantico.com>
COPYRIGHT AND LICENSE¶
Copyright 2002 by semantico
This library is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.