TitleTest.php

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<?php
 
class TitleTest extends MediaWikiTestCase {
    protected function setUp() {
        parent::setUp();
 
        $this->setMwGlobals( [
            'wgAllowUserJs' => false,
            'wgDefaultLanguageVariant' => false,
            'wgMetaNamespace' => 'Project',
        ] );
        $this->setUserLang( 'en' );
        $this->setContentLang( 'en' );
    }
 
    public function testLegalChars() {
        $titlechars = Title::legalChars();
 
        foreach ( range( 1, 255 ) as $num ) {
            $chr = chr( $num );
            if ( strpos( "#[]{}<>|", $chr ) !== false || preg_match( "/[\\x00-\\x1f\\x7f]/", $chr ) ) {
                $this->assertFalse(
                    (bool)preg_match( "/[$titlechars]/", $chr ),
                    "chr($num) = $chr is not a valid titlechar"
                );
            } else {
                $this->assertTrue(
                    (bool)preg_match( "/[$titlechars]/", $chr ),
                    "chr($num) = $chr is a valid titlechar"
                );
            }
        }
    }
 
    public static function provideValidSecureAndSplit() {
        return [
            [ 'Sandbox' ],
            [ 'A "B"' ],
            [ 'A \'B\'' ],
            [ '.com' ],
            [ '~' ],
            [ '#' ],
            [ '"' ],
            [ '\'' ],
            [ 'Talk:Sandbox' ],
            [ 'Talk:Foo:Sandbox' ],
            [ 'File:Example.svg' ],
            [ 'File_talk:Example.svg' ],
            [ 'Foo/.../Sandbox' ],
            [ 'Sandbox/...' ],
            [ 'A~~' ],
            [ ':A' ],
            // Length is 256 total, but only title part matters
            [ 'Category:' . str_repeat( 'x', 248 ) ],
            [ str_repeat( 'x', 252 ) ],
            // interwiki prefix
            [ 'localtestiw: #anchor' ],
            [ 'localtestiw:' ],
            [ 'localtestiw:foo' ],
            [ 'localtestiw: foo # anchor' ],
            [ 'localtestiw: Talk: Sandbox # anchor' ],
            [ 'remotetestiw:' ],
            [ 'remotetestiw: Talk: # anchor' ],
            [ 'remotetestiw: #bar' ],
            [ 'remotetestiw: Talk:' ],
            [ 'remotetestiw: Talk: Foo' ],
            [ 'localtestiw:remotetestiw:' ],
            [ 'localtestiw:remotetestiw:foo' ]
        ];
    }
 
    public static function provideInvalidSecureAndSplit() {
        return [
            [ '', 'title-invalid-empty' ],
            [ ':', 'title-invalid-empty' ],
            [ '__  __', 'title-invalid-empty' ],
            [ '  __  ', 'title-invalid-empty' ],
            // Bad characters forbidden regardless of wgLegalTitleChars
            [ 'A [ B', 'title-invalid-characters' ],
            [ 'A ] B', 'title-invalid-characters' ],
            [ 'A { B', 'title-invalid-characters' ],
            [ 'A } B', 'title-invalid-characters' ],
            [ 'A < B', 'title-invalid-characters' ],
            [ 'A > B', 'title-invalid-characters' ],
            [ 'A | B', 'title-invalid-characters' ],
            [ "A \t B", 'title-invalid-characters' ],
            [ "A \n B", 'title-invalid-characters' ],
            // URL encoding
            [ 'A%20B', 'title-invalid-characters' ],
            [ 'A%23B', 'title-invalid-characters' ],
            [ 'A%2523B', 'title-invalid-characters' ],
            // XML/HTML character entity references
            // Note: Commented out because they are not marked invalid by the PHP test as
            // Title::newFromText runs Sanitizer::decodeCharReferencesAndNormalize first.
            // 'A &eacute; B',
            // 'A &#233; B',
            // 'A &#x00E9; B',
            // Subject of NS_TALK does not roundtrip to NS_MAIN
            [ 'Talk:File:Example.svg', 'title-invalid-talk-namespace' ],
            // Directory navigation
            [ '.', 'title-invalid-relative' ],
            [ '..', 'title-invalid-relative' ],
            [ './Sandbox', 'title-invalid-relative' ],
            [ '../Sandbox', 'title-invalid-relative' ],
            [ 'Foo/./Sandbox', 'title-invalid-relative' ],
            [ 'Foo/../Sandbox', 'title-invalid-relative' ],
            [ 'Sandbox/.', 'title-invalid-relative' ],
            [ 'Sandbox/..', 'title-invalid-relative' ],
            // Tilde
            [ 'A ~~~ Name', 'title-invalid-magic-tilde' ],
            [ 'A ~~~~ Signature', 'title-invalid-magic-tilde' ],
            [ 'A ~~~~~ Timestamp', 'title-invalid-magic-tilde' ],
            // Length
            [ str_repeat( 'x', 256 ), 'title-invalid-too-long' ],
            // Namespace prefix without actual title
            [ 'Talk:', 'title-invalid-empty' ],
            [ 'Talk:#', 'title-invalid-empty' ],
            [ 'Category: ', 'title-invalid-empty' ],
            [ 'Category: #bar', 'title-invalid-empty' ],
            // interwiki prefix
            [ 'localtestiw: Talk: # anchor', 'title-invalid-empty' ],
            [ 'localtestiw: Talk:', 'title-invalid-empty' ]
        ];
    }
 
    private function secureAndSplitGlobals() {
        $this->setMwGlobals( [
            'wgLocalInterwikis' => [ 'localtestiw' ],
            'wgHooks' => [
                'InterwikiLoadPrefix' => [
                    function ( $prefix, &$data ) {
                        if ( $prefix === 'localtestiw' ) {
                            $data = [ 'iw_url' => 'localtestiw' ];
                        } elseif ( $prefix === 'remotetestiw' ) {
                            $data = [ 'iw_url' => 'remotetestiw' ];
                        }
                        return false;
                    }
                ]
            ]
        ] );
 
        // Reset TitleParser since we modified $wgLocalInterwikis
        $this->setService( 'TitleParser', new MediaWikiTitleCodec(
                Language::factory( 'en' ),
                new GenderCache(),
                [ 'localtestiw' ]
        ) );
    }
 
    public function testSecureAndSplitValid( $text ) {
        $this->secureAndSplitGlobals();
        $this->assertInstanceOf( 'Title', Title::newFromText( $text ), "Valid: $text" );
    }
 
    public function testSecureAndSplitInvalid( $text, $expectedErrorMessage ) {
        $this->secureAndSplitGlobals();
        try {
            Title::newFromTextThrow( $text ); // should throw
            $this->assertTrue( false, "Invalid: $text" );
        } catch ( MalformedTitleException $ex ) {
            $this->assertEquals( $expectedErrorMessage, $ex->getErrorMessage(), "Invalid: $text" );
        }
    }
 
    public static function provideConvertByteClassToUnicodeClass() {
        return [
            [
                ' %!"$&\'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z~\\x80-\\xFF+',
                ' %!"$&\'()*,\\-./0-9:;=?@A-Z\\\\\\^_`a-z~+\\u0080-\\uFFFF',
            ],
            [
                'QWERTYf-\\xFF+',
                'QWERTYf-\\x7F+\\u0080-\\uFFFF',
            ],
            [
                'QWERTY\\x66-\\xFD+',
                'QWERTYf-\\x7F+\\u0080-\\uFFFF',
            ],
            [
                'QWERTYf-y+',
                'QWERTYf-y+',
            ],
            [
                'QWERTYf-\\x80+',
                'QWERTYf-\\x7F+\\u0080-\\uFFFF',
            ],
            [
                'QWERTY\\x66-\\x80+\\x23',
                'QWERTYf-\\x7F+#\\u0080-\\uFFFF',
            ],
            [
                'QWERTY\\x66-\\x80+\\xD3',
                'QWERTYf-\\x7F+\\u0080-\\uFFFF',
            ],
            [
                '\\\\\\x99',
                '\\\\\\u0080-\\uFFFF',
            ],
            [
                '-\\x99',
                '\\-\\u0080-\\uFFFF',
            ],
            [
                'QWERTY\\-\\x99',
                'QWERTY\\-\\u0080-\\uFFFF',
            ],
            [
                '\\\\x99',
                '\\\\x99',
            ],
            [
                'A-\\x9F',
                'A-\\x7F\\u0080-\\uFFFF',
            ],
            [
                '\\x66-\\x77QWERTY\\x88-\\x91FXZ',
                'f-wQWERTYFXZ\\u0080-\\uFFFF',
            ],
            [
                '\\x66-\\x99QWERTY\\xAA-\\xEEFXZ',
                'f-\\x7FQWERTYFXZ\\u0080-\\uFFFF',
            ],
        ];
    }
 
    public function testConvertByteClassToUnicodeClass( $byteClass, $unicodeClass ) {
        $this->assertEquals( $unicodeClass, Title::convertByteClassToUnicodeClass( $byteClass ) );
    }
 
    public function testFixSpecialNameRetainsParameter( $text, $expectedParam ) {
        $title = Title::newFromText( $text );
        $fixed = $title->fixSpecialName();
        $stuff = explode( '/', $fixed->getDBkey(), 2 );
        if ( count( $stuff ) == 2 ) {
            $par = $stuff[1];
        } else {
            $par = null;
        }
        $this->assertEquals(
            $expectedParam,
            $par,
            "T33100 regression check: Title->fixSpecialName() should preserve parameter"
        );
    }
 
    public static function provideSpecialNamesWithAndWithoutParameter() {
        return [
            [ 'Special:Version', null ],
            [ 'Special:Version/', '' ],
            [ 'Special:Version/param', 'param' ],
        ];
    }
 
    public function testIsValidMoveOperation( $source, $target, $expected ) {
        $this->setMwGlobals( 'wgContentHandlerUseDB', false );
        $title = Title::newFromText( $source );
        $nt = Title::newFromText( $target );
        $errors = $title->isValidMoveOperation( $nt, false );
        if ( $expected === true ) {
            $this->assertTrue( $errors );
        } else {
            $errors = $this->flattenErrorsArray( $errors );
            foreach ( (array)$expected as $error ) {
                $this->assertContains( $error, $errors );
            }
        }
    }
 
    public static function provideTestIsValidMoveOperation() {
        return [
            // for Title::isValidMoveOperation
            [ 'Some page', '', 'badtitletext' ],
            [ 'Test', 'Test', 'selfmove' ],
            [ 'Special:FooBar', 'Test', 'immobile-source-namespace' ],
            [ 'Test', 'Special:FooBar', 'immobile-target-namespace' ],
            [ 'MediaWiki:Common.js', 'Help:Some wikitext page', 'bad-target-model' ],
            [ 'Page', 'File:Test.jpg', 'nonfile-cannot-move-to-file' ],
            // for Title::validateFileMoveOperation
            [ 'File:Test.jpg', 'Page', 'imagenocrossnamespace' ],
        ];
    }
 
    public function testWgWhitelistReadRegexp( $whitelistRegexp, $source, $action, $expected ) {
        // $wgWhitelistReadRegexp must be an array. Since the provided test cases
        // usually have only one regex, it is more concise to write the lonely regex
        // as a string. Thus we cast to an array() to honor $wgWhitelistReadRegexp
        // type requisite.
        if ( is_string( $whitelistRegexp ) ) {
            $whitelistRegexp = [ $whitelistRegexp ];
        }
 
        $this->setMwGlobals( [
            // So User::isEveryoneAllowed( 'read' ) === false
            'wgGroupPermissions' => [ '*' => [ 'read' => false ] ],
            'wgWhitelistRead' => [ 'some random non sense title' ],
            'wgWhitelistReadRegexp' => $whitelistRegexp,
        ] );
 
        $title = Title::newFromDBkey( $source );
 
        // New anonymous user with no rights
        $user = new User;
        $user->mRights = [];
        $errors = $title->userCan( $action, $user );
 
        if ( is_bool( $expected ) ) {
            # Forge the assertion message depending on the assertion expectation
            $allowableness = $expected
                ? " should be allowed"
                : " should NOT be allowed";
            $this->assertEquals(
                $expected,
                $errors,
                "User action '$action' on [[$source]] $allowableness."
            );
        } else {
            $errors = $this->flattenErrorsArray( $errors );
            foreach ( (array)$expected as $error ) {
                $this->assertContains( $error, $errors );
            }
        }
    }
 
    public function dataWgWhitelistReadRegexp() {
        $ALLOWED = true;
        $DISALLOWED = false;
 
        return [
            // Everything, if this doesn't work, we're really in trouble
            [ '/.*/', 'Main_Page', 'read', $ALLOWED ],
            [ '/.*/', 'Main_Page', 'edit', $DISALLOWED ],
 
            // We validate against the title name, not the db key
            [ '/^Main_Page$/', 'Main_Page', 'read', $DISALLOWED ],
            // Main page
            [ '/^Main/', 'Main_Page', 'read', $ALLOWED ],
            [ '/^Main.*/', 'Main_Page', 'read', $ALLOWED ],
            // With spaces
            [ '/Mic\sCheck/', 'Mic Check', 'read', $ALLOWED ],
            // Unicode multibyte
            // ...without unicode modifier
            [ '/Unicode Test . Yes/', 'Unicode Test Ñ Yes', 'read', $DISALLOWED ],
            // ...with unicode modifier
            [ '/Unicode Test . Yes/u', 'Unicode Test Ñ Yes', 'read', $ALLOWED ],
            // Case insensitive
            [ '/MiC ChEcK/', 'mic check', 'read', $DISALLOWED ],
            [ '/MiC ChEcK/i', 'mic check', 'read', $ALLOWED ],
 
            // From DefaultSettings.php:
            [ "@^UsEr.*@i", 'User is banned', 'read', $ALLOWED ],
            [ "@^UsEr.*@i", 'User:John Doe', 'read', $ALLOWED ],
 
            // With namespaces:
            [ '/^Special:NewPages$/', 'Special:NewPages', 'read', $ALLOWED ],
            [ null, 'Special:Newpages', 'read', $DISALLOWED ],
 
        ];
    }
 
    public function flattenErrorsArray( $errors ) {
        $result = [];
        foreach ( $errors as $error ) {
            $result[] = $error[0];
        }
 
        return $result;
    }
 
    public function testGetPageViewLanguage( $expected, $titleText, $contLang,
        $lang, $variant, $msg = ''
    ) {
        // Setup environnement for this test
        $this->setMwGlobals( [
            'wgDefaultLanguageVariant' => $variant,
            'wgAllowUserJs' => true,
        ] );
        $this->setUserLang( $lang );
        $this->setContentLang( $contLang );
 
        $title = Title::newFromText( $titleText );
        $this->assertInstanceOf( 'Title', $title,
            "Test must be passed a valid title text, you gave '$titleText'"
        );
        $this->assertEquals( $expected,
            $title->getPageViewLanguage()->getCode(),
            $msg
        );
    }
 
    public static function provideGetPageViewLanguage() {
        # Format:
        # - expected
        # - Title name
        # - wgContLang (expected in most case)
        # - wgLang (on some specific pages)
        # - wgDefaultLanguageVariant
        # - Optional message
        return [
            [ 'fr', 'Help:I_need_somebody', 'fr', 'fr', false ],
            [ 'es', 'Help:I_need_somebody', 'es', 'zh-tw', false ],
            [ 'zh', 'Help:I_need_somebody', 'zh', 'zh-tw', false ],
 
            [ 'es', 'Help:I_need_somebody', 'es', 'zh-tw', 'zh-cn' ],
            [ 'es', 'MediaWiki:About', 'es', 'zh-tw', 'zh-cn' ],
            [ 'es', 'MediaWiki:About/', 'es', 'zh-tw', 'zh-cn' ],
            [ 'de', 'MediaWiki:About/de', 'es', 'zh-tw', 'zh-cn' ],
            [ 'en', 'MediaWiki:Common.js', 'es', 'zh-tw', 'zh-cn' ],
            [ 'en', 'MediaWiki:Common.css', 'es', 'zh-tw', 'zh-cn' ],
            [ 'en', 'User:JohnDoe/Common.js', 'es', 'zh-tw', 'zh-cn' ],
            [ 'en', 'User:JohnDoe/Monobook.css', 'es', 'zh-tw', 'zh-cn' ],
 
            [ 'zh-cn', 'Help:I_need_somebody', 'zh', 'zh-tw', 'zh-cn' ],
            [ 'zh', 'MediaWiki:About', 'zh', 'zh-tw', 'zh-cn' ],
            [ 'zh', 'MediaWiki:About/', 'zh', 'zh-tw', 'zh-cn' ],
            [ 'de', 'MediaWiki:About/de', 'zh', 'zh-tw', 'zh-cn' ],
            [ 'zh-cn', 'MediaWiki:About/zh-cn', 'zh', 'zh-tw', 'zh-cn' ],
            [ 'zh-tw', 'MediaWiki:About/zh-tw', 'zh', 'zh-tw', 'zh-cn' ],
            [ 'en', 'MediaWiki:Common.js', 'zh', 'zh-tw', 'zh-cn' ],
            [ 'en', 'MediaWiki:Common.css', 'zh', 'zh-tw', 'zh-cn' ],
            [ 'en', 'User:JohnDoe/Common.js', 'zh', 'zh-tw', 'zh-cn' ],
            [ 'en', 'User:JohnDoe/Monobook.css', 'zh', 'zh-tw', 'zh-cn' ],
 
            [ 'zh-tw', 'Special:NewPages', 'es', 'zh-tw', 'zh-cn' ],
            [ 'zh-tw', 'Special:NewPages', 'zh', 'zh-tw', 'zh-cn' ],
 
        ];
    }
 
    public function testGetBaseText( $title, $expected, $msg = '' ) {
        $title = Title::newFromText( $title );
        $this->assertEquals( $expected,
            $title->getBaseText(),
            $msg
        );
    }
 
    public static function provideBaseTitleCases() {
        return [
            # Title, expected base, optional message
            [ 'User:John_Doe/subOne/subTwo', 'John Doe/subOne' ],
            [ 'User:Foo/Bar/Baz', 'Foo/Bar' ],
        ];
    }
 
    public function testGetRootText( $title, $expected, $msg = '' ) {
        $title = Title::newFromText( $title );
        $this->assertEquals( $expected,
            $title->getRootText(),
            $msg
        );
    }
 
    public static function provideRootTitleCases() {
        return [
            # Title, expected base, optional message
            [ 'User:John_Doe/subOne/subTwo', 'John Doe' ],
            [ 'User:Foo/Bar/Baz', 'Foo' ],
        ];
    }
 
    public function testGetSubpageText( $title, $expected, $msg = '' ) {
        $title = Title::newFromText( $title );
        $this->assertEquals( $expected,
            $title->getSubpageText(),
            $msg
        );
    }
 
    public static function provideSubpageTitleCases() {
        return [
            # Title, expected base, optional message
            [ 'User:John_Doe/subOne/subTwo', 'subTwo' ],
            [ 'User:John_Doe/subOne', 'subOne' ],
        ];
    }
 
    public static function provideNewFromTitleValue() {
        return [
            [ new TitleValue( NS_MAIN, 'Foo' ) ],
            [ new TitleValue( NS_MAIN, 'Foo', 'bar' ) ],
            [ new TitleValue( NS_USER, 'Hansi_Maier' ) ],
        ];
    }
 
    public function testNewFromTitleValue( TitleValue $value ) {
        $title = Title::newFromTitleValue( $value );
 
        $dbkey = str_replace( ' ', '_', $value->getText() );
        $this->assertEquals( $dbkey, $title->getDBkey() );
        $this->assertEquals( $value->getNamespace(), $title->getNamespace() );
        $this->assertEquals( $value->getFragment(), $title->getFragment() );
    }
 
    public static function provideGetTitleValue() {
        return [
            [ 'Foo' ],
            [ 'Foo#bar' ],
            [ 'User:Hansi_Maier' ],
        ];
    }
 
    public function testGetTitleValue( $text ) {
        $title = Title::newFromText( $text );
        $value = $title->getTitleValue();
 
        $dbkey = str_replace( ' ', '_', $value->getText() );
        $this->assertEquals( $title->getDBkey(), $dbkey );
        $this->assertEquals( $title->getNamespace(), $value->getNamespace() );
        $this->assertEquals( $title->getFragment(), $value->getFragment() );
    }
 
    public static function provideGetFragment() {
        return [
            [ 'Foo', '' ],
            [ 'Foo#bar', 'bar' ],
            [ 'Foo#bär', 'bär' ],
 
            // Inner whitespace is normalized
            [ 'Foo#bar_bar', 'bar bar' ],
            [ 'Foo#bar bar', 'bar bar' ],
            [ 'Foo#bar   bar', 'bar bar' ],
 
            // Leading whitespace is kept, trailing whitespace is trimmed.
            // XXX: Is this really want we want?
            [ 'Foo#_bar_bar_', ' bar bar' ],
            [ 'Foo# bar bar ', ' bar bar' ],
        ];
    }
 
    public function testGetFragment( $full, $fragment ) {
        $title = Title::newFromText( $full );
        $this->assertEquals( $fragment, $title->getFragment() );
    }
 
    public function testIsAlwaysKnown( $page, $isKnown ) {
        $title = Title::newFromText( $page );
        $this->assertEquals( $isKnown, $title->isAlwaysKnown() );
    }
 
    public static function provideIsAlwaysKnown() {
        return [
            [ 'Some nonexistent page', false ],
            [ 'UTPage', false ],
            [ '#test', true ],
            [ 'Special:BlankPage', true ],
            [ 'Special:SomeNonexistentSpecialPage', false ],
            [ 'MediaWiki:Parentheses', true ],
            [ 'MediaWiki:Some nonexistent message', false ],
        ];
    }
 
    public function testIsValid( Title $title, $isValid ) {
        $this->assertEquals( $isValid, $title->isValid(), $title->getPrefixedText() );
    }
 
    public static function provideIsValid() {
        return [
            [ Title::makeTitle( NS_MAIN, '' ), false ],
            [ Title::makeTitle( NS_MAIN, '<>' ), false ],
            [ Title::makeTitle( NS_MAIN, '|' ), false ],
            [ Title::makeTitle( NS_MAIN, '#' ), false ],
            [ Title::makeTitle( NS_MAIN, 'Test' ), true ],
            [ Title::makeTitle( -33, 'Test' ), false ],
            [ Title::makeTitle( 77663399, 'Test' ), false ],
        ];
    }
 
    public function testIsAlwaysKnownOnInterwiki() {
        $title = Title::makeTitle( NS_MAIN, 'Interwiki link', '', 'externalwiki' );
        $this->assertTrue( $title->isAlwaysKnown() );
    }
 
    public function testExists() {
        $title = Title::makeTitle( NS_PROJECT, 'New page' );
        $linkCache = LinkCache::singleton();
 
        $article = new Article( $title );
        $page = $article->getPage();
        $page->doEditContent( new WikitextContent( 'Some [[link]]' ), 'summary' );
 
        // Tell Title it doesn't know whether it exists
        $title->mArticleID = -1;
 
        // Tell the link cache it doesn't exists when it really does
        $linkCache->clearLink( $title );
        $linkCache->addBadLinkObj( $title );
 
        $this->assertEquals(
            false,
            $title->exists(),
            'exists() should rely on link cache unless GAID_FOR_UPDATE is used'
        );
        $this->assertEquals(
            true,
            $title->exists( Title::GAID_FOR_UPDATE ),
            'exists() should re-query database when GAID_FOR_UPDATE is used'
        );
    }
 
    public function provideCanHaveTalkPage() {
        return [
            'User page has talk page' => [
                Title::makeTitle( NS_USER, 'Jane' ), true
            ],
            'Talke page has talk page' => [
                Title::makeTitle( NS_TALK, 'Foo' ), true
            ],
            'Special page cannot have talk page' => [
                Title::makeTitle( NS_SPECIAL, 'Thing' ), false
            ],
            'Virtual namespace cannot have talk page' => [
                Title::makeTitle( NS_MEDIA, 'Kitten.jpg' ), false
            ],
        ];
    }
 
    public function testCanHaveTalkPage( Title $title, $expected ) {
        $actual = $title->canHaveTalkPage();
        $this->assertSame( $expected, $actual, $title->getPrefixedDBkey() );
    }
 
    public function testCanTalk( Title $title, $expected ) {
        $actual = $title->canTalk();
        $this->assertSame( $expected, $actual, $title->getPrefixedDBkey() );
    }
 
    public static function provideGetTalkPage_good() {
        return [
            [ Title::makeTitle( NS_MAIN, 'Test' ), Title::makeTitle( NS_TALK, 'Test' ) ],
            [ Title::makeTitle( NS_TALK, 'Test' ), Title::makeTitle( NS_TALK, 'Test' ) ],
        ];
    }
 
    public function testGetTalkPage_good( Title $title, Title $expected ) {
        $talk = $title->getTalkPage();
        $this->assertSame(
            $expected->getPrefixedDBKey(),
            $talk->getPrefixedDBKey(),
            $title->getPrefixedDBKey()
        );
    }
 
    public function testGetTalkPageIfDefined_good( Title $title ) {
        $talk = $title->getTalkPageIfDefined();
        $this->assertInstanceOf(
            Title::class,
            $talk,
            $title->getPrefixedDBKey()
        );
    }
 
    public static function provideGetTalkPage_bad() {
        return [
            [ Title::makeTitle( NS_SPECIAL, 'Test' ) ],
            [ Title::makeTitle( NS_MEDIA, 'Test' ) ],
        ];
    }
 
    public function testGetTalkPageIfDefined_bad( Title $title ) {
        $talk = $title->getTalkPageIfDefined();
        $this->assertNull(
            $talk,
            $title->getPrefixedDBKey()
        );
    }
 
    public function provideCreateFragmentTitle() {
        return [
            [ Title::makeTitle( NS_MAIN, 'Test' ), 'foo' ],
            [ Title::makeTitle( NS_TALK, 'Test', 'foo' ), '' ],
            [ Title::makeTitle( NS_CATEGORY, 'Test', 'foo' ), 'bar' ],
            [ Title::makeTitle( NS_MAIN, 'Test1', '', 'interwiki' ), 'baz' ]
        ];
    }
 
    public function testCreateFragmentTitle( Title $title, $fragment ) {
        $this->mergeMwGlobalArrayValue( 'wgHooks', [
            'InterwikiLoadPrefix' => [
                function ( $prefix, &$iwdata ) {
                    if ( $prefix === 'interwiki' ) {
                        $iwdata = [
                            'iw_url' => 'http://example.com/',
                            'iw_local' => 0,
                            'iw_trans' => 0,
                        ];
                        return false;
                    }
                },
            ],
        ] );
 
        $fragmentTitle = $title->createFragmentTarget( $fragment );
 
        $this->assertEquals( $title->getNamespace(), $fragmentTitle->getNamespace() );
        $this->assertEquals( $title->getText(), $fragmentTitle->getText() );
        $this->assertEquals( $title->getInterwiki(), $fragmentTitle->getInterwiki() );
        $this->assertEquals( $fragment, $fragmentTitle->getFragment() );
    }
 
    public function provideGetPrefixedText() {
        return [
            // ns = 0
            [
                Title::makeTitle( NS_MAIN, 'Foo bar' ),
                'Foo bar'
            ],
            // ns = 2
            [
                Title::makeTitle( NS_USER, 'Foo bar' ),
                'User:Foo bar'
            ],
            // ns = 3
            [
                Title::makeTitle( NS_USER_TALK, 'Foo bar' ),
                'User talk:Foo bar'
            ],
            // fragment not included
            [
                Title::makeTitle( NS_MAIN, 'Foo bar', 'fragment' ),
                'Foo bar'
            ],
            // ns = -2
            [
                Title::makeTitle( NS_MEDIA, 'Foo bar' ),
                'Media:Foo bar'
            ],
            // non-existent namespace
            [
                Title::makeTitle( 100777, 'Foo bar' ),
                'Special:Badtitle/NS100777:Foo bar'
            ],
        ];
    }
 
    public function testGetPrefixedText( Title $title, $expected ) {
        $this->assertEquals( $expected, $title->getPrefixedText() );
    }
 
    public function provideGetPrefixedDBKey() {
        return [
            // ns = 0
            [
                Title::makeTitle( NS_MAIN, 'Foo_bar' ),
                'Foo_bar'
            ],
            // ns = 2
            [
                Title::makeTitle( NS_USER, 'Foo_bar' ),
                'User:Foo_bar'
            ],
            // ns = 3
            [
                Title::makeTitle( NS_USER_TALK, 'Foo_bar' ),
                'User_talk:Foo_bar'
            ],
            // fragment not included
            [
                Title::makeTitle( NS_MAIN, 'Foo_bar', 'fragment' ),
                'Foo_bar'
            ],
            // ns = -2
            [
                Title::makeTitle( NS_MEDIA, 'Foo_bar' ),
                'Media:Foo_bar'
            ],
            // non-existent namespace
            [
                Title::makeTitle( 100777, 'Foo_bar' ),
                'Special:Badtitle/NS100777:Foo_bar'
            ],
        ];
    }
 
    public function testGetPrefixedDBKey( Title $title, $expected ) {
        $this->assertEquals( $expected, $title->getPrefixedDBkey() );
    }
}