public function descriptionProvider()
{
$descriptionFactory = new DescriptionFactory();
$dataItemFactory = new DataItemFactory();
#0 SMW_CMP_EQ
$description = $descriptionFactory->newValueDescription($dataItemFactory->newDIWikiPage('Foo', NS_MAIN), null, SMW_CMP_EQ);
$expected = new \stdClass();
$expected->type = 2;
$expected->alias = "t0";
$expected->joinfield = array(42);
$provider[] = array($description, $expected);
#1 SMW_CMP_LEQ
$description = $descriptionFactory->newValueDescription($dataItemFactory->newDIWikiPage('Foo', NS_MAIN), null, SMW_CMP_LEQ);
$expected = new \stdClass();
$expected->type = 1;
$expected->alias = "t0";
$expected->joinfield = "t0.smw_id";
$expected->where = "t0.smw_sortkey<=Foo";
$provider[] = array($description, $expected);
#2 SMW_CMP_LIKE
$description = $descriptionFactory->newValueDescription($dataItemFactory->newDIWikiPage('Foo', NS_MAIN), null, SMW_CMP_LIKE);
$expected = new \stdClass();
$expected->type = 1;
$expected->alias = "t0";
$expected->joinfield = "t0.smw_id";
$expected->where = "t0.smw_sortkey LIKE Foo";
$provider[] = array($description, $expected);
#3 not a DIWikiPage
$description = $descriptionFactory->newValueDescription($dataItemFactory->newDIBLob('Foo'));
$expected = new \stdClass();
$expected->type = 1;
$expected->joinfield = "";
$expected->where = "";
$provider[] = array($description, $expected);
return $provider;
}