DerivedPageDataUpdaterTest.php

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<?php
 
namespace MediaWiki\Tests\Storage;
 
use CommentStoreComment;
use Content;
use ContentHandler;
use LinksUpdate;
use MediaWiki\MediaWikiServices;
use MediaWiki\Revision\MutableRevisionRecord;
use MediaWiki\Revision\MutableRevisionSlots;
use MediaWiki\Revision\RevisionRecord;
use MediaWiki\Revision\SlotRecord;
use MediaWiki\Storage\DerivedPageDataUpdater;
use MediaWiki\Storage\RevisionSlotsUpdate;
use MediaWikiTestCase;
use MWCallableUpdate;
use MWTimestamp;
use PHPUnit\Framework\MockObject\MockObject;
use TextContent;
use TextContentHandler;
use Title;
use User;
use Wikimedia\TestingAccessWrapper;
use WikiPage;
use WikitextContent;
 
class DerivedPageDataUpdaterTest extends MediaWikiTestCase {
 
    public function tearDown() {
        MWTimestamp::setFakeTime( false );
 
        parent::tearDown();
    }
 
    private function getTitle( $title ) {
        return Title::makeTitleSafe( $this->getDefaultWikitextNS(), $title );
    }
 
    private function getPage( $title ) {
        $title = ( $title instanceof Title ) ? $title : $this->getTitle( $title );
 
        return WikiPage::factory( $title );
    }
 
    private function getDerivedPageDataUpdater( $page, RevisionRecord $rec = null ) {
        if ( is_string( $page ) || $page instanceof Title ) {
            $page = $this->getPage( $page );
        }
 
        $page = TestingAccessWrapper::newFromObject( $page );
        return $page->getDerivedDataUpdater( null, $rec );
    }
 
    private function createRevision( WikiPage $page, $summary, $content = null ) {
        $user = $this->getTestUser()->getUser();
        $comment = CommentStoreComment::newUnsavedComment( $summary );
 
        if ( $content === null || is_string( $content ) ) {
            $content = new WikitextContent( $content ?? $summary );
        }
 
        if ( !is_array( $content ) ) {
            $content = [ 'main' => $content ];
        }
 
        $this->getDerivedPageDataUpdater( $page ); // flush cached instance before.
 
        $updater = $page->newPageUpdater( $user );
 
        foreach ( $content as $role => $c ) {
            $updater->setContent( $role, $c );
        }
 
        $rev = $updater->saveRevision( $comment );
 
        $this->getDerivedPageDataUpdater( $page ); // flush cached instance after.
        return $rev;
    }
 
    // TODO: test setArticleCountMethod() and isCountable();
    // TODO: test isRedirect() and wasRedirect()
 
    public function testGetCanonicalParserOptions() {
        $user = $this->getTestUser()->getUser();
        $page = $this->getPage( __METHOD__ );
 
        $parentRev = $this->createRevision( $page, 'first' );
 
        $mainContent = new WikitextContent( 'Lorem ipsum' );
 
        $update = new RevisionSlotsUpdate();
        $update->modifyContent( SlotRecord::MAIN, $mainContent );
        $updater = $this->getDerivedPageDataUpdater( $page );
        $updater->prepareContent( $user, $update, false );
 
        $options1 = $updater->getCanonicalParserOptions();
        $this->assertSame( MediaWikiServices::getInstance()->getContentLanguage(),
            $options1->getUserLangObj() );
 
        $speculativeId = $options1->getSpeculativeRevId();
        $this->assertSame( $parentRev->getId() + 1, $speculativeId );
 
        $rev = $this->makeRevision(
            $page->getTitle(),
            $update,
            $user,
            $parentRev->getId() + 7,
            $parentRev->getId()
        );
        $updater->prepareUpdate( $rev );
 
        $options2 = $updater->getCanonicalParserOptions();
 
        $currentRev = call_user_func( $options2->getCurrentRevisionCallback(), $page->getTitle() );
        $this->assertSame( $rev->getId(), $currentRev->getId() );
    }
 
    public function testGrabCurrentRevision() {
        $page = $this->getPage( __METHOD__ );
 
        $updater0 = $this->getDerivedPageDataUpdater( $page );
        $this->assertNull( $updater0->grabCurrentRevision() );
        $this->assertFalse( $updater0->pageExisted() );
 
        $rev1 = $this->createRevision( $page, 'first' );
        $updater1 = $this->getDerivedPageDataUpdater( $page );
        $this->assertSame( $rev1->getId(), $updater1->grabCurrentRevision()->getId() );
        $this->assertFalse( $updater0->pageExisted() );
        $this->assertTrue( $updater1->pageExisted() );
 
        $rev2 = $this->createRevision( $page, 'second' );
        $updater2 = $this->getDerivedPageDataUpdater( $page );
        $this->assertSame( $rev1->getId(), $updater1->grabCurrentRevision()->getId() );
        $this->assertSame( $rev2->getId(), $updater2->grabCurrentRevision()->getId() );
    }
 
    public function testPrepareContent() {
        $sysop = $this->getTestUser( [ 'sysop' ] )->getUser();
        $updater = $this->getDerivedPageDataUpdater( __METHOD__ );
 
        $this->assertFalse( $updater->isContentPrepared() );
 
        // TODO: test stash
        // TODO: MCR: Test multiple slots. Test slot removal.
        $mainContent = new WikitextContent( 'first [[main]] ~~~' );
        $auxContent = new WikitextContent( 'inherited ~~~ content' );
        $auxSlot = SlotRecord::newSaved(
            10, 7, 'tt:7',
            SlotRecord::newUnsaved( 'aux', $auxContent )
        );
 
        $update = new RevisionSlotsUpdate();
        $update->modifyContent( SlotRecord::MAIN, $mainContent );
        $update->modifySlot( SlotRecord::newInherited( $auxSlot ) );
        // TODO: MCR: test removing slots!
 
        $updater->prepareContent( $sysop, $update, false );
 
        // second be ok to call again with the same params
        $updater->prepareContent( $sysop, $update, false );
 
        $this->assertNull( $updater->grabCurrentRevision() );
        $this->assertTrue( $updater->isContentPrepared() );
        $this->assertFalse( $updater->isUpdatePrepared() );
        $this->assertFalse( $updater->pageExisted() );
        $this->assertTrue( $updater->isCreation() );
        $this->assertTrue( $updater->isChange() );
        $this->assertFalse( $updater->isContentDeleted() );
 
        $this->assertNotNull( $updater->getRevision() );
        $this->assertNotNull( $updater->getRenderedRevision() );
 
        $this->assertEquals( [ 'main', 'aux' ], $updater->getSlots()->getSlotRoles() );
        $this->assertEquals( [ 'main' ], array_keys( $updater->getSlots()->getOriginalSlots() ) );
        $this->assertEquals( [ 'aux' ], array_keys( $updater->getSlots()->getInheritedSlots() ) );
        $this->assertEquals( [ 'main', 'aux' ], $updater->getModifiedSlotRoles() );
        $this->assertEquals( [ 'main', 'aux' ], $updater->getTouchedSlotRoles() );
 
        $mainSlot = $updater->getRawSlot( SlotRecord::MAIN );
        $this->assertInstanceOf( SlotRecord::class, $mainSlot );
        $this->assertNotContains( '~~~', $mainSlot->getContent()->serialize(), 'PST should apply.' );
        $this->assertContains( $sysop->getName(), $mainSlot->getContent()->serialize() );
 
        $auxSlot = $updater->getRawSlot( 'aux' );
        $this->assertInstanceOf( SlotRecord::class, $auxSlot );
        $this->assertContains( '~~~', $auxSlot->getContent()->serialize(), 'No PST should apply.' );
 
        $mainOutput = $updater->getCanonicalParserOutput();
        $this->assertContains( 'first', $mainOutput->getText() );
        $this->assertContains( '<a ', $mainOutput->getText() );
        $this->assertNotEmpty( $mainOutput->getLinks() );
 
        $canonicalOutput = $updater->getCanonicalParserOutput();
        $this->assertContains( 'first', $canonicalOutput->getText() );
        $this->assertContains( '<a ', $canonicalOutput->getText() );
        $this->assertContains( 'inherited ', $canonicalOutput->getText() );
        $this->assertNotEmpty( $canonicalOutput->getLinks() );
    }
 
    public function testPrepareContentInherit() {
        $sysop = $this->getTestUser( [ 'sysop' ] )->getUser();
        $page = $this->getPage( __METHOD__ );
 
        $mainContent1 = new WikitextContent( 'first [[main]] ({{REVISIONUSER}}) #~~~#' );
        $mainContent2 = new WikitextContent( 'second ({{subst:REVISIONUSER}}) #~~~#' );
 
        $rev = $this->createRevision( $page, 'first', $mainContent1 );
        $mainContent1 = $rev->getContent( SlotRecord::MAIN ); // get post-pst content
        $userName = $rev->getUser()->getName();
        $sysopName = $sysop->getName();
 
        $update = new RevisionSlotsUpdate();
        $update->modifyContent( SlotRecord::MAIN, $mainContent1 );
        $updater1 = $this->getDerivedPageDataUpdater( $page );
        $updater1->prepareContent( $sysop, $update, false );
 
        $this->assertNotNull( $updater1->grabCurrentRevision() );
        $this->assertTrue( $updater1->isContentPrepared() );
        $this->assertTrue( $updater1->pageExisted() );
        $this->assertFalse( $updater1->isCreation() );
        $this->assertFalse( $updater1->isChange() );
 
        $this->assertNotNull( $updater1->getRevision() );
        $this->assertNotNull( $updater1->getRenderedRevision() );
 
        // parser-output for null-edit uses the original author's name
        $html = $updater1->getRenderedRevision()->getRevisionParserOutput()->getText();
        $this->assertNotContains( $sysopName, $html, '{{REVISIONUSER}}' );
        $this->assertNotContains( '{{REVISIONUSER}}', $html, '{{REVISIONUSER}}' );
        $this->assertNotContains( '~~~', $html, 'signature ~~~' );
        $this->assertContains( '(' . $userName . ')', $html, '{{REVISIONUSER}}' );
        $this->assertContains( '>' . $userName . '<', $html, 'signature ~~~' );
 
        // TODO: MCR: test inheritance from parent
        $update = new RevisionSlotsUpdate();
        $update->modifyContent( SlotRecord::MAIN, $mainContent2 );
        $updater2 = $this->getDerivedPageDataUpdater( $page );
        $updater2->prepareContent( $sysop, $update, false );
 
        // non-null edit use the new user name in PST
        $pstText = $updater2->getSlots()->getContent( SlotRecord::MAIN )->serialize();
        $this->assertNotContains( '{{subst:REVISIONUSER}}', $pstText, '{{subst:REVISIONUSER}}' );
        $this->assertNotContains( '~~~', $pstText, 'signature ~~~' );
        $this->assertContains( '(' . $sysopName . ')', $pstText, '{{subst:REVISIONUSER}}' );
        $this->assertContains( ':' . $sysopName . '|', $pstText, 'signature ~~~' );
 
        $this->assertFalse( $updater2->isCreation() );
        $this->assertTrue( $updater2->isChange() );
    }
 
    // TODO: test failure of prepareContent() when called again...
    // - with different user
    // - with different update
    // - after calling prepareUpdate()
 
    public function testPrepareUpdate() {
        $page = $this->getPage( __METHOD__ );
 
        $mainContent1 = new WikitextContent( 'first [[main]] ~~~' );
        $rev1 = $this->createRevision( $page, 'first', $mainContent1 );
        $updater1 = $this->getDerivedPageDataUpdater( $page, $rev1 );
 
        $options = []; // TODO: test *all* the options...
        $updater1->prepareUpdate( $rev1, $options );
 
        $this->assertTrue( $updater1->isUpdatePrepared() );
        $this->assertTrue( $updater1->isContentPrepared() );
        $this->assertTrue( $updater1->isCreation() );
        $this->assertTrue( $updater1->isChange() );
        $this->assertFalse( $updater1->isContentDeleted() );
 
        $this->assertNotNull( $updater1->getRevision() );
        $this->assertNotNull( $updater1->getRenderedRevision() );
 
        $this->assertEquals( [ 'main' ], $updater1->getSlots()->getSlotRoles() );
        $this->assertEquals( [ 'main' ], array_keys( $updater1->getSlots()->getOriginalSlots() ) );
        $this->assertEquals( [], array_keys( $updater1->getSlots()->getInheritedSlots() ) );
        $this->assertEquals( [ 'main' ], $updater1->getModifiedSlotRoles() );
        $this->assertEquals( [ 'main' ], $updater1->getTouchedSlotRoles() );
 
        // TODO: MCR: test multiple slots, test slot removal!
 
        $this->assertInstanceOf( SlotRecord::class, $updater1->getRawSlot( SlotRecord::MAIN ) );
        $this->assertNotContains( '~~~~', $updater1->getRawContent( SlotRecord::MAIN )->serialize() );
 
        $mainOutput = $updater1->getCanonicalParserOutput();
        $this->assertContains( 'first', $mainOutput->getText() );
        $this->assertContains( '<a ', $mainOutput->getText() );
        $this->assertNotEmpty( $mainOutput->getLinks() );
 
        $canonicalOutput = $updater1->getCanonicalParserOutput();
        $this->assertContains( 'first', $canonicalOutput->getText() );
        $this->assertContains( '<a ', $canonicalOutput->getText() );
        $this->assertNotEmpty( $canonicalOutput->getLinks() );
 
        $mainContent2 = new WikitextContent( 'second' );
        $rev2 = $this->createRevision( $page, 'second', $mainContent2 );
        $updater2 = $this->getDerivedPageDataUpdater( $page, $rev2 );
 
        $options = []; // TODO: test *all* the options...
        $updater2->prepareUpdate( $rev2, $options );
 
        $this->assertFalse( $updater2->isCreation() );
        $this->assertTrue( $updater2->isChange() );
 
        $canonicalOutput = $updater2->getCanonicalParserOutput();
        $this->assertContains( 'second', $canonicalOutput->getText() );
    }
 
    public function testPrepareUpdateReusesParserOutput() {
        $user = $this->getTestUser()->getUser();
        $page = $this->getPage( __METHOD__ );
 
        $mainContent1 = new WikitextContent( 'first [[main]] ~~~' );
 
        $update = new RevisionSlotsUpdate();
        $update->modifyContent( SlotRecord::MAIN, $mainContent1 );
        $updater = $this->getDerivedPageDataUpdater( $page );
        $updater->prepareContent( $user, $update, false );
 
        $mainOutput = $updater->getSlotParserOutput( SlotRecord::MAIN );
        $canonicalOutput = $updater->getCanonicalParserOutput();
 
        $rev = $this->createRevision( $page, 'first', $mainContent1 );
 
        $options = []; // TODO: test *all* the options...
        $updater->prepareUpdate( $rev, $options );
 
        $this->assertTrue( $updater->isUpdatePrepared() );
        $this->assertTrue( $updater->isContentPrepared() );
 
        $this->assertSame( $mainOutput, $updater->getSlotParserOutput( SlotRecord::MAIN ) );
        $this->assertSame( $canonicalOutput, $updater->getCanonicalParserOutput() );
    }
 
    public function testPrepareUpdateOutputReset() {
        $user = $this->getTestUser()->getUser();
        $page = $this->getPage( __METHOD__ );
 
        $mainContent1 = new WikitextContent( 'first --{{REVISIONID}}--' );
 
        $update = new RevisionSlotsUpdate();
        $update->modifyContent( SlotRecord::MAIN, $mainContent1 );
        $updater = $this->getDerivedPageDataUpdater( $page );
        $updater->prepareContent( $user, $update, false );
 
        $mainOutput = $updater->getSlotParserOutput( SlotRecord::MAIN );
        $canonicalOutput = $updater->getCanonicalParserOutput();
 
        // prevent optimization on matching speculative ID
        $mainOutput->setSpeculativeRevIdUsed( 0 );
        $canonicalOutput->setSpeculativeRevIdUsed( 0 );
 
        $rev = $this->createRevision( $page, 'first', $mainContent1 );
 
        $options = []; // TODO: test *all* the options...
        $updater->prepareUpdate( $rev, $options );
 
        $this->assertTrue( $updater->isUpdatePrepared() );
        $this->assertTrue( $updater->isContentPrepared() );
 
        // ParserOutput objects should have been flushed.
        $this->assertNotSame( $mainOutput, $updater->getSlotParserOutput( SlotRecord::MAIN ) );
        $this->assertNotSame( $canonicalOutput, $updater->getCanonicalParserOutput() );
 
        $html = $updater->getCanonicalParserOutput()->getText();
        $this->assertContains( '--' . $rev->getId() . '--', $html );
 
        // TODO: MCR: ensure that when the main slot uses {{REVISIONID}} but another slot is
        // updated, the main slot is still re-rendered!
    }
 
    // TODO: test failure of prepareUpdate() when called again with a different revision
    // TODO: test failure of prepareUpdate() on inconsistency with prepareContent.
 
    public function testGetPreparedEditAfterPrepareContent() {
        $user = $this->getTestUser()->getUser();
 
        $mainContent = new WikitextContent( 'first [[main]] ~~~' );
        $update = new RevisionSlotsUpdate();
        $update->modifyContent( SlotRecord::MAIN, $mainContent );
 
        $updater = $this->getDerivedPageDataUpdater( __METHOD__ );
        $updater->prepareContent( $user, $update, false );
 
        $canonicalOutput = $updater->getCanonicalParserOutput();
 
        $preparedEdit = $updater->getPreparedEdit();
        $this->assertSame( $canonicalOutput->getCacheTime(), $preparedEdit->timestamp );
        $this->assertSame( $canonicalOutput, $preparedEdit->output );
        $this->assertSame( $mainContent, $preparedEdit->newContent );
        $this->assertSame( $updater->getRawContent( SlotRecord::MAIN ), $preparedEdit->pstContent );
        $this->assertSame( $updater->getCanonicalParserOptions(), $preparedEdit->popts );
        $this->assertSame( null, $preparedEdit->revid );
    }
 
    public function testGetPreparedEditAfterPrepareUpdate() {
        $clock = MWTimestamp::convert( TS_UNIX, '20100101000000' );
        MWTimestamp::setFakeTime( function () use ( &$clock ) {
            return $clock++;
        } );
 
        $page = $this->getPage( __METHOD__ );
 
        $mainContent = new WikitextContent( 'first [[main]] ~~~' );
        $update = new MutableRevisionSlots();
        $update->setContent( SlotRecord::MAIN, $mainContent );
 
        $rev = $this->createRevision( $page, __METHOD__ );
 
        $updater = $this->getDerivedPageDataUpdater( $page );
        $updater->prepareUpdate( $rev );
 
        $canonicalOutput = $updater->getCanonicalParserOutput();
 
        $preparedEdit = $updater->getPreparedEdit();
        $this->assertSame( $canonicalOutput->getCacheTime(), $preparedEdit->timestamp );
        $this->assertSame( $canonicalOutput, $preparedEdit->output );
        $this->assertSame( $updater->getRawContent( SlotRecord::MAIN ), $preparedEdit->pstContent );
        $this->assertSame( $updater->getCanonicalParserOptions(), $preparedEdit->popts );
        $this->assertSame( $rev->getId(), $preparedEdit->revid );
    }
 
    public function testGetSecondaryDataUpdatesAfterPrepareContent() {
        $user = $this->getTestUser()->getUser();
        $page = $this->getPage( __METHOD__ );
        $this->createRevision( $page, __METHOD__ );
 
        $mainContent1 = new WikitextContent( 'first' );
 
        $update = new RevisionSlotsUpdate();
        $update->modifyContent( SlotRecord::MAIN, $mainContent1 );
        $updater = $this->getDerivedPageDataUpdater( $page );
        $updater->prepareContent( $user, $update, false );
 
        $dataUpdates = $updater->getSecondaryDataUpdates();
 
        $this->assertNotEmpty( $dataUpdates );
 
        $linksUpdates = array_filter( $dataUpdates, function ( $du ) {
            return $du instanceof LinksUpdate;
        } );
        $this->assertCount( 1, $linksUpdates );
    }
 
    private function defineMockContentModelForUpdateTesting( $name ) {
        $handler = $this->getMockBuilder( TextContentHandler::class )
            ->setConstructorArgs( [ $name ] )
            ->setMethods(
                [ 'getSecondaryDataUpdates', 'getDeletionUpdates', 'unserializeContent' ]
            )
            ->getMock();
 
        $dataUpdate = new MWCallableUpdate( 'time' );
        $dataUpdate->_name = "$name data update";
 
        $deletionUpdate = new MWCallableUpdate( 'time' );
        $deletionUpdate->_name = "$name deletion update";
 
        $handler->method( 'getSecondaryDataUpdates' )->willReturn( [ $dataUpdate ] );
        $handler->method( 'getDeletionUpdates' )->willReturn( [ $deletionUpdate ] );
        $handler->method( 'unserializeContent' )->willReturnCallback(
            function ( $text ) use ( $handler ) {
                return $this->createMockContent( $handler, $text );
            }
        );
 
        $this->mergeMwGlobalArrayValue(
            'wgContentHandlers', [
                $name => function () use ( $handler ){
                    return $handler;
                }
            ]
        );
 
        return $handler;
    }
 
    private function createMockContent( ContentHandler $handler, $text ) {
        $content = $this->getMockBuilder( TextContent::class )
            ->setConstructorArgs( [ $text ] )
            ->setMethods( [ 'getModel', 'getContentHandler' ] )
            ->getMock();
 
        $content->method( 'getModel' )->willReturn( $handler->getModelID() );
        $content->method( 'getContentHandler' )->willReturn( $handler );
 
        return $content;
    }
 
    public function testGetSecondaryDataUpdatesWithSlotRemoval() {
        global $wgMultiContentRevisionSchemaMigrationStage;
 
        if ( ! ( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW ) ) {
            $this->markTestSkipped( 'Slot removal cannot happen with MCR being enabled' );
        }
 
        $m1 = $this->defineMockContentModelForUpdateTesting( 'M1' );
        $a1 = $this->defineMockContentModelForUpdateTesting( 'A1' );
        $m2 = $this->defineMockContentModelForUpdateTesting( 'M2' );
 
        $mainContent1 = $this->createMockContent( $m1, 'main 1' );
        $auxContent1 = $this->createMockContent( $a1, 'aux 1' );
        $mainContent2 = $this->createMockContent( $m2, 'main 2' );
 
        $user = $this->getTestUser()->getUser();
        $page = $this->getPage( __METHOD__ );
        $this->createRevision(
            $page,
            __METHOD__,
            [ 'main' => $mainContent1, 'aux' => $auxContent1 ]
        );
 
        $update = new RevisionSlotsUpdate();
        $update->modifyContent( SlotRecord::MAIN, $mainContent2 );
        $update->removeSlot( 'aux' );
 
        $page = $this->getPage( __METHOD__ );
        $updater = $this->getDerivedPageDataUpdater( $page );
        $updater->prepareContent( $user, $update, false );
 
        $dataUpdates = $updater->getSecondaryDataUpdates();
 
        $this->assertNotEmpty( $dataUpdates );
 
        $updateNames = array_map( function ( $du ) {
            return isset( $du->_name ) ? $du->_name : get_class( $du );
        }, $dataUpdates );
 
        $this->assertContains( LinksUpdate::class, $updateNames );
        $this->assertContains( 'A1 deletion update', $updateNames );
        $this->assertContains( 'M2 data update', $updateNames );
        $this->assertNotContains( 'M1 data update', $updateNames );
    }
 
    private function makeRevision(
        Title $title,
        RevisionSlotsUpdate $update,
        User $user,
        $comment,
        $id = 0,
        $parentId = 0
    ) {
        $rev = new MutableRevisionRecord( $title );
 
        $rev->applyUpdate( $update );
        $rev->setUser( $user );
        $rev->setComment( CommentStoreComment::newUnsavedComment( $comment ) );
        $rev->setPageId( $title->getArticleID() );
        $rev->setParentId( $parentId );
 
        if ( $id ) {
            $rev->setId( $id );
        }
 
        return $rev;
    }
 
    private function getMockTitle( $id = 23 ) {
        $mock = $this->getMockBuilder( Title::class )
            ->disableOriginalConstructor()
            ->getMock();
        $mock->expects( $this->any() )
            ->method( 'getDBkey' )
            ->will( $this->returnValue( __CLASS__ ) );
        $mock->expects( $this->any() )
            ->method( 'getArticleID' )
            ->will( $this->returnValue( $id ) );
 
        return $mock;
    }
 
    public function provideIsReusableFor() {
        $title = $this->getMockTitle();
 
        $user1 = User::newFromName( 'Alice' );
        $user2 = User::newFromName( 'Bob' );
 
        $content1 = new WikitextContent( 'one' );
        $content2 = new WikitextContent( 'two' );
 
        $update1 = new RevisionSlotsUpdate();
        $update1->modifyContent( SlotRecord::MAIN, $content1 );
 
        $update1b = new RevisionSlotsUpdate();
        $update1b->modifyContent( 'xyz', $content1 );
 
        $update2 = new RevisionSlotsUpdate();
        $update2->modifyContent( SlotRecord::MAIN, $content2 );
 
        $rev1 = $this->makeRevision( $title, $update1, $user1, 'rev1', 11 );
        $rev1b = $this->makeRevision( $title, $update1b, $user1, 'rev1', 11 );
 
        $rev2 = $this->makeRevision( $title, $update2, $user1, 'rev2', 12 );
        $rev2x = $this->makeRevision( $title, $update2, $user2, 'rev2', 12 );
        $rev2y = $this->makeRevision( $title, $update2, $user1, 'rev2', 122 );
 
        yield 'any' => [
            '$prepUser' => null,
            '$prepRevision' => null,
            '$prepUpdate' => null,
            '$forUser' => null,
            '$forRevision' => null,
            '$forUpdate' => null,
            '$forParent' => null,
            '$isReusable' => true,
        ];
        yield 'for any' => [
            '$prepUser' => $user1,
            '$prepRevision' => $rev1,
            '$prepUpdate' => $update1,
            '$forUser' => null,
            '$forRevision' => null,
            '$forUpdate' => null,
            '$forParent' => null,
            '$isReusable' => true,
        ];
        yield 'unprepared' => [
            '$prepUser' => null,
            '$prepRevision' => null,
            '$prepUpdate' => null,
            '$forUser' => $user1,
            '$forRevision' => $rev1,
            '$forUpdate' => $update1,
            '$forParent' => 0,
            '$isReusable' => true,
        ];
        yield 'match prepareContent' => [
            '$prepUser' => $user1,
            '$prepRevision' => null,
            '$prepUpdate' => $update1,
            '$forUser' => $user1,
            '$forRevision' => null,
            '$forUpdate' => $update1,
            '$forParent' => 0,
            '$isReusable' => true,
        ];
        yield 'match prepareUpdate' => [
            '$prepUser' => null,
            '$prepRevision' => $rev1,
            '$prepUpdate' => null,
            '$forUser' => $user1,
            '$forRevision' => $rev1,
            '$forUpdate' => null,
            '$forParent' => 0,
            '$isReusable' => true,
        ];
        yield 'match all' => [
            '$prepUser' => $user1,
            '$prepRevision' => $rev1,
            '$prepUpdate' => $update1,
            '$forUser' => $user1,
            '$forRevision' => $rev1,
            '$forUpdate' => $update1,
            '$forParent' => 0,
            '$isReusable' => true,
        ];
        yield 'mismatch prepareContent update' => [
            '$prepUser' => $user1,
            '$prepRevision' => null,
            '$prepUpdate' => $update1,
            '$forUser' => $user1,
            '$forRevision' => null,
            '$forUpdate' => $update1b,
            '$forParent' => 0,
            '$isReusable' => false,
        ];
        yield 'mismatch prepareContent user' => [
            '$prepUser' => $user1,
            '$prepRevision' => null,
            '$prepUpdate' => $update1,
            '$forUser' => $user2,
            '$forRevision' => null,
            '$forUpdate' => $update1,
            '$forParent' => 0,
            '$isReusable' => false,
        ];
        yield 'mismatch prepareContent parent' => [
            '$prepUser' => $user1,
            '$prepRevision' => null,
            '$prepUpdate' => $update1,
            '$forUser' => $user1,
            '$forRevision' => null,
            '$forUpdate' => $update1,
            '$forParent' => 7,
            '$isReusable' => false,
        ];
        yield 'mismatch prepareUpdate revision update' => [
            '$prepUser' => null,
            '$prepRevision' => $rev1,
            '$prepUpdate' => null,
            '$forUser' => null,
            '$forRevision' => $rev1b,
            '$forUpdate' => null,
            '$forParent' => 0,
            '$isReusable' => false,
        ];
        yield 'mismatch prepareUpdate revision user' => [
            '$prepUser' => null,
            '$prepRevision' => $rev2,
            '$prepUpdate' => null,
            '$forUser' => null,
            '$forRevision' => $rev2x,
            '$forUpdate' => null,
            '$forParent' => 0,
            '$isReusable' => false,
        ];
        yield 'mismatch prepareUpdate revision id' => [
            '$prepUser' => null,
            '$prepRevision' => $rev2,
            '$prepUpdate' => null,
            '$forUser' => null,
            '$forRevision' => $rev2y,
            '$forUpdate' => null,
            '$forParent' => 0,
            '$isReusable' => false,
        ];
    }
 
    public function testIsReusableFor(
        User $prepUser = null,
        RevisionRecord $prepRevision = null,
        RevisionSlotsUpdate $prepUpdate = null,
        User $forUser = null,
        RevisionRecord $forRevision = null,
        RevisionSlotsUpdate $forUpdate = null,
        $forParent = null,
        $isReusable = null
    ) {
        $updater = $this->getDerivedPageDataUpdater( __METHOD__ );
 
        if ( $prepUpdate ) {
            $updater->prepareContent( $prepUser, $prepUpdate, false );
        }
 
        if ( $prepRevision ) {
            $updater->prepareUpdate( $prepRevision );
        }
 
        $this->assertSame(
            $isReusable,
            $updater->isReusableFor( $forUser, $forRevision, $forUpdate, $forParent )
        );
    }
 
    public function testDoUpdates() {
        $page = $this->getPage( __METHOD__ );
 
        $content = [ 'main' => new WikitextContent( 'first [[main]]' ) ];
 
        if ( $this->hasMultiSlotSupport() ) {
            $content['aux'] = new WikitextContent( 'Aux [[Nix]]' );
        }
 
        $rev = $this->createRevision( $page, 'first', $content );
        $pageId = $page->getId();
 
        $oldStats = $this->db->selectRow( 'site_stats', '*', '1=1' );
        $this->db->delete( 'pagelinks', '*' );
 
        $pcache = MediaWikiServices::getInstance()->getParserCache();
        $pcache->deleteOptionsKey( $page );
 
        $updater = $this->getDerivedPageDataUpdater( $page, $rev );
        $updater->setArticleCountMethod( 'link' );
 
        $options = []; // TODO: test *all* the options...
        $updater->prepareUpdate( $rev, $options );
 
        $updater->doUpdates();
 
        // links table update
        $pageLinks = $this->db->select(
            'pagelinks',
            '*',
            [ 'pl_from' => $pageId ],
            __METHOD__,
            [ 'ORDER BY' => 'pl_namespace, pl_title' ]
        );
 
        $pageLinksRow = $pageLinks->fetchObject();
        $this->assertInternalType( 'object', $pageLinksRow );
        $this->assertSame( 'Main', $pageLinksRow->pl_title );
 
        if ( $this->hasMultiSlotSupport() ) {
            $pageLinksRow = $pageLinks->fetchObject();
            $this->assertInternalType( 'object', $pageLinksRow );
            $this->assertSame( 'Nix', $pageLinksRow->pl_title );
        }
 
        // parser cache update
        $cached = $pcache->get( $page, $updater->getCanonicalParserOptions() );
        $this->assertInternalType( 'object', $cached );
        $this->assertSame( $updater->getCanonicalParserOutput(), $cached );
 
        // site stats
        $stats = $this->db->selectRow( 'site_stats', '*', '1=1' );
        $this->assertSame( $oldStats->ss_total_pages + 1, (int)$stats->ss_total_pages );
        $this->assertSame( $oldStats->ss_total_edits + 1, (int)$stats->ss_total_edits );
        $this->assertSame( $oldStats->ss_good_articles + 1, (int)$stats->ss_good_articles );
 
        // TODO: MCR: test data updates for additional slots!
        // TODO: test update for edit without page creation
        // TODO: test message cache purge
        // TODO: test module cache purge
        // TODO: test CDN purge
        // TODO: test newtalk update
        // TODO: test search update
        // TODO: test site stats good_articles while turning the page into (or back from) a redir.
        // TODO: test category membership update (with setRcWatchCategoryMembership())
    }
 
    public function testDoParserCacheUpdate() {
        $page = $this->getPage( __METHOD__ );
        $this->createRevision( $page, 'Dummy' );
 
        $user = $this->getTestUser()->getUser();
 
        $update = new RevisionSlotsUpdate();
        $update->modifyContent( 'main', new WikitextContent( 'first [[Main]]' ) );
 
        if ( $this->hasMultiSlotSupport() ) {
            $update->modifyContent( 'aux', new WikitextContent( 'Aux [[Nix]]' ) );
        }
 
        // Emulate update after edit ----------
        $pcache = MediaWikiServices::getInstance()->getParserCache();
        $pcache->deleteOptionsKey( $page );
 
        $rev = $this->makeRevision( $page->getTitle(), $update, $user, 'rev', null );
        $rev->setTimestamp( '20100101000000' );
        $rev->setParentId( $page->getLatest() );
 
        $updater = $this->getDerivedPageDataUpdater( $page );
        $updater->prepareContent( $user, $update, false );
 
        $rev->setId( 11 );
        $updater->prepareUpdate( $rev );
 
        // Force the page timestamp, so we notice whether ParserOutput::getTimestamp
        // or ParserOutput::getCacheTime are used.
        $page->setTimestamp( $rev->getTimestamp() );
        $updater->doParserCacheUpdate();
 
        // The cached ParserOutput should not use the revision timestamp
        $cached = $pcache->get( $page, $updater->getCanonicalParserOptions(), true );
        $this->assertInternalType( 'object', $cached );
        $this->assertSame( $updater->getCanonicalParserOutput(), $cached );
 
        $this->assertSame( $rev->getTimestamp(), $cached->getCacheTime() );
        $this->assertSame( $rev->getId(), $cached->getCacheRevisionId() );
 
        // Emulate forced update of an old revision ----------
        $pcache->deleteOptionsKey( $page );
 
        $updater = $this->getDerivedPageDataUpdater( $page );
        $updater->prepareUpdate( $rev );
 
        // Force the page timestamp, so we notice whether ParserOutput::getTimestamp
        // or ParserOutput::getCacheTime are used.
        $page->setTimestamp( $rev->getTimestamp() );
        $updater->doParserCacheUpdate();
 
        // The cached ParserOutput should not use the revision timestamp
        $cached = $pcache->get( $page, $updater->getCanonicalParserOptions(), true );
        $this->assertInternalType( 'object', $cached );
        $this->assertSame( $updater->getCanonicalParserOutput(), $cached );
 
        $this->assertGreaterThan( $rev->getTimestamp(), $cached->getCacheTime() );
        $this->assertSame( $rev->getId(), $cached->getCacheRevisionId() );
    }
 
    private function hasMultiSlotSupport() {
        global $wgMultiContentRevisionSchemaMigrationStage;
 
        return ( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_WRITE_NEW )
            && ( $wgMultiContentRevisionSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW );
    }
 
}