ExportTest.php

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<?php

class ExportTest extends MediaWikiLangTestCase {

    protected function setUp() {
        parent::setUp();
        $this->setMwGlobals( [
            'wgCapitalLinks' => true,
        ] );
    }

    public function testPageByTitle() {
        global $wgContLang;
        $pageTitle = 'UTPage';

        $exporter = new WikiExporter(
            $this->db,
            WikiExporter::FULL
        );

        $title = Title::newFromText( $pageTitle );

        $sink = new DumpStringOutput;
        $exporter->setOutputSink( $sink );
        $exporter->openStream();
        $exporter->pageByTitle( $title );
        $exporter->closeStream();

        // This throws error if invalid xml output
        $xmlObject = simplexml_load_string( $sink );

        $xmlNamespaces = (array)$xmlObject->siteinfo->namespaces->namespace;
        $xmlNamespaces = str_replace( ' ', '_', $xmlNamespaces );
        unset( $xmlNamespaces[ '@attributes' ] );
        foreach ( $xmlNamespaces as &$namespaceObject ) {
            if ( is_object( $namespaceObject ) ) {
                $namespaceObject = '';
            }
        }

        $actualNamespaces = (array)$wgContLang->getNamespaces();
        $actualNamespaces = array_values( $actualNamespaces );
        $this->assertEquals( $actualNamespaces, $xmlNamespaces );

        // Check xml page title correct
        $xmlTitle = (array)$xmlObject->page->title;
        $this->assertEquals( $pageTitle, $xmlTitle[0] );

        // Check xml page text is not empty
        $text = (array)$xmlObject->page->revision->text;
        $this->assertNotEquals( '', $text[0] );
    }

}