NAME

Test::RDF - Test RDF data for content, validity and equality, etc.

VERSION

Version 1.20

SYNOPSIS

 use Test::RDF;

 is_valid_rdf($rdf_string, $syntax,  'RDF string is valid according to selected syntax');
 is_rdf($rdf_string, $syntax1, $expected_rdf_string, $syntax2, 'The two strings have the same triples');
 isomorph_graphs($model, $expected_model, 'The two models have the same triples');
 are_subgraphs($model1, $model2, 'Model 1 is a subgraph of model 2' );
 has_uri($uri_string, $model, 'Has correct URI');
 hasnt_uri($uri_string, $model, "Hasn't correct URI");
 has_subject($uri_string, $model, 'Subject URI is found');
 has_predicate($uri_string, $model, 'Predicate URI is found');
 has_object_uri($uri_string, $model, 'Object URI is found');
 has_literal($string, $language, $datatype, $model, 'Literal is found');
 hasnt_literal($string, $language, $datatype, $model, 'Literal is not found');
 pattern_target($model);
 pattern_ok($pattern, '$pattern found in $model');
 pattern_fail($pattern, '$pattern not found in $model');

DESCRIPTION

This Perl module, Test::RDF, provides tools for testing code which deals with RDF. It can test RDF for validity, check if two RDF graphs are the same, or subgraphs of each other, if a URI is or is not in a dataset, if it has certain subjects, predicates, objects or literals. It can also test to see if a full pattern is present or absent.

EXPORT

is_valid_rdf

Use to check if the input RDF string is valid in the chosen syntax

is_rdf

Use to check if the input RDF strings are isomorphic (i.e. the same).

isomorph_graphs

Use to check if the input RDF::Trine::Models have isomorphic graphs.

are_subgraphs

Use to check if the first RDF::Trine::Models is a subgraph of the second.

has_subject

Check if the string URI passed as first argument is a subject in any of the statements given in the model given as second argument.

has_predicate

Check if the string URI passed as first argument is a predicate in any of the statements given in the model given as second argument.

has_object_uri

Check if the string URI passed as first argument is a object in any of the statements given in the model given as second argument.

has_literal

Check if the string passed as first argument, with corresponding optional language and datatype as second and third respectively, is a literal in any of the statements given in the model given as fourth argument.

language and datatype may not occur in the same statement, so the test fails if they are both set. If none are used, use undef, like e.g.

 has_literal('A test', undef, undef, $model, 'Simple literal');

A test for a typed literal may be done like

 has_literal('42', undef, 'http://www.w3.org/2001/XMLSchema#integer', $model, 'Just an integer');

and a language literal like

 has_literal('This is a Another test', 'en', undef, $model, 'Language literal');

hasnt_literal

This is like the above, only the opposite: It checks if a literal doesn't exist. Like the above, the test will fail if the literal is invalid, however.

has_uri

Check if the string URI passed as first argument is present in any of the statements given in the model given as second argument.

hasnt_uri

Check if the string URI passed as first argument is not present in any of the statements given in the model given as second argument.

pattern_target

Tests that the object passed as its parameter is an RDF::Trine::Model or RDF::Trine::Store. That is, tests that it is a valid thing to match basic graph patterns against.

Additionally, this test establishes the target for future pattern_ok tests.

pattern_ok

Tests that the pattern passed matches against the target established by pattern_target. The pattern may be passed as an RDF::Trine::Pattern, or a list of RDF::Trine::Statement objects.

 use Test::RDF;
 use RDF::Trine qw[iri literal blank variable statement];
 use My::Module;

 my $foaf = RDF::Trine::Namespace->new('http://xmlns.com/foaf/0.1/');
 pattern_target(My::Module->get_model); # check isa RDF::Trine::Model
 pattern_ok(
   statement(
     variable('who'),
     $foaf->name,
     literal('Kjetil Kjernsmo')
     ),
   statement(
     variable('who'),
     $foaf->page,
     iri('http://search.cpan.org/~kjetilk/')
     ),
   "Data contains Kjetil's details."
   );

Note: pattern_target must have been tested before any pattern_ok tests.

pattern_fail

The same as above, but tests if the pattern returns no results instead.

NOTE

Graph isomorphism is a complex problem, so do not attempt to run the isomorphism tests on large datasets. For more information see http://en.wikipedia.org/wiki/Graph_isomorphism_problem.

AUTHOR

Kjetil Kjernsmo, <kjetilk at cpan.org>

BUGS

Please report any bugs using github

SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc Test::RDF

You may find the Perl and RDF community website useful.

You can also look for information at:

• AnnoCPAN: Annotated CPAN documentation

  http://annocpan.org/dist/Test-RDF

• CPAN Ratings

  http://cpanratings.perl.org/d/Test-RDF

• Search CPAN

  http://search.cpan.org/dist/Test-RDF/

• MetaCPAN

  https://metacpan.org/module/Test::RDF

ACKNOWLEDGEMENTS

Michael Hendricks wrote the first Test::RDF. The present module is a complete rewrite from scratch using Gregory Todd William's RDF::Trine::Graph to do the heavy lifting.

Toby Inkster has submitted the pattern_* functions.

LICENSE AND COPYRIGHT

Copyright 2010 ABC Startsiden AS. Copyright 2010, 2011, 2012, 2013, 2014, 2015 Kjetil Kjernsmo.

This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.

See http://dev.perl.org/licenses/ for more information.