tests/phpunit/maintenance/backupTextPassTest.php

   1 <?php
   2
   3 require_once __DIR__ . "/../../../maintenance/backupTextPass.inc";
   4
   5 /**
   6  * Tests for page dumps of BackupDumper
   7  *
   8  * @group Database
   9  * @group Dump
  10  */
  11 class TextPassDumperTest extends DumpTestCase {
  12
  13         // We'll add several pages, revision and texts. The following variables hold the
  14         // corresponding ids.
  15         private $pageId1, $pageId2, $pageId3, $pageId4;
  16         private static $numOfPages = 4;
  17         private $revId1_1, $textId1_1;
  18         private $revId2_1, $textId2_1, $revId2_2, $textId2_2;
  19         private $revId2_3, $textId2_3, $revId2_4, $textId2_4;
  20         private $revId3_1, $textId3_1, $revId3_2, $textId3_2;
  21         private $revId4_1, $textId4_1;
  22         private static $numOfRevs = 8;
  23
  24         function addDBData() {
  25                 $this->tablesUsed[] = 'page';
  26                 $this->tablesUsed[] = 'revision';
  27                 $this->tablesUsed[] = 'text';
  28
  29                 $ns = $this->getDefaultWikitextNS();
  30
  31                 try {
  32                         // Simple page
  33                         $title = Title::newFromText( 'BackupDumperTestP1', $ns );
  34                         $page = WikiPage::factory( $title );
  35                         list( $this->revId1_1, $this->textId1_1 ) = $this->addRevision( $page,
  36                                 "BackupDumperTestP1Text1", "BackupDumperTestP1Summary1" );
  37                         $this->pageId1 = $page->getId();
  38
  39                         // Page with more than one revision
  40                         $title = Title::newFromText( 'BackupDumperTestP2', $ns );
  41                         $page = WikiPage::factory( $title );
  42                         list( $this->revId2_1, $this->textId2_1 ) = $this->addRevision( $page,
  43                                 "BackupDumperTestP2Text1", "BackupDumperTestP2Summary1" );
  44                         list( $this->revId2_2, $this->textId2_2 ) = $this->addRevision( $page,
  45                                 "BackupDumperTestP2Text2", "BackupDumperTestP2Summary2" );
  46                         list( $this->revId2_3, $this->textId2_3 ) = $this->addRevision( $page,
  47                                 "BackupDumperTestP2Text3", "BackupDumperTestP2Summary3" );
  48                         list( $this->revId2_4, $this->textId2_4 ) = $this->addRevision( $page,
  49                                 "BackupDumperTestP2Text4 some additional Text  ",
  50                                 "BackupDumperTestP2Summary4 extra " );
  51                         $this->pageId2 = $page->getId();
  52
  53                         // Deleted page.
  54                         $title = Title::newFromText( 'BackupDumperTestP3', $ns );
  55                         $page = WikiPage::factory( $title );
  56                         list( $this->revId3_1, $this->textId3_1 ) = $this->addRevision( $page,
  57                                 "BackupDumperTestP3Text1", "BackupDumperTestP2Summary1" );
  58                         list( $this->revId3_2, $this->textId3_2 ) = $this->addRevision( $page,
  59                                 "BackupDumperTestP3Text2", "BackupDumperTestP2Summary2" );
  60                         $this->pageId3 = $page->getId();
  61                         $page->doDeleteArticle( "Testing ;)" );
  62
  63                         // Page from non-default namespace
  64
  65                         if ( $ns === NS_TALK ) {
  66                                 //@todo: work around this.
  67                                 throw new MWException( "The default wikitext namespace is the talk namespace. "
  68                                         . " We can't currently deal with that." );
  69                         }
  70
  71                         $title = Title::newFromText( 'BackupDumperTestP1', NS_TALK );
  72                         $page = WikiPage::factory( $title );
  73                         list( $this->revId4_1, $this->textId4_1 ) = $this->addRevision( $page,
  74                                 "Talk about BackupDumperTestP1 Text1",
  75                                 "Talk BackupDumperTestP1 Summary1" );
  76                         $this->pageId4 = $page->getId();
  77                 } catch ( Exception $e ) {
  78                         // We'd love to pass $e directly. However, ... see
  79                         // documentation of exceptionFromAddDBData in
  80                         // DumpTestCase
  81                         $this->exceptionFromAddDBData = $e;
  82                 }
  83
  84         }
  85
  86         protected function setUp() {
  87                 parent::setUp();
  88
  89                 // Since we will restrict dumping by page ranges (to allow
  90                 // working tests, even if the db gets prepopulated by a base
  91                 // class), we have to assert, that the page id are consecutively
  92                 // increasing
  93                 $this->assertEquals(
  94                         array( $this->pageId2, $this->pageId3, $this->pageId4 ),
  95                         array( $this->pageId1 + 1, $this->pageId2 + 1, $this->pageId3 + 1 ),
  96                         "Page ids increasing without holes" );
  97
  98         }
  99
 100         function testPlain() {
 101                 // Setting up the dump
 102                 $nameStub = $this->setUpStub();
 103                 $nameFull = $this->getNewTempFile();
 104                 $dumper = new TextPassDumper( array( "--stub=file:" . $nameStub,
 105                         "--output=file:" . $nameFull ) );
 106                 $dumper->reporting = false;
 107                 $dumper->setDb( $this->db );
 108
 109                 // Performing the dump
 110                 $dumper->dump( WikiExporter::FULL, WikiExporter::TEXT );
 111
 112                 // Checking for correctness of the dumped data
 113                 $this->assertDumpStart( $nameFull );
 114
 115                 // Page 1
 116                 $this->assertPageStart( $this->pageId1, NS_MAIN, "BackupDumperTestP1" );
 117                 $this->assertRevision( $this->revId1_1, "BackupDumperTestP1Summary1",
 118                         $this->textId1_1, false, "0bolhl6ol7i6x0e7yq91gxgaan39j87",
 119                         "BackupDumperTestP1Text1" );
 120                 $this->assertPageEnd();
 121
 122                 // Page 2
 123                 $this->assertPageStart( $this->pageId2, NS_MAIN, "BackupDumperTestP2" );
 124                 $this->assertRevision( $this->revId2_1, "BackupDumperTestP2Summary1",
 125                         $this->textId2_1, false, "jprywrymfhysqllua29tj3sc7z39dl2",
 126                         "BackupDumperTestP2Text1" );
 127                 $this->assertRevision( $this->revId2_2, "BackupDumperTestP2Summary2",
 128                         $this->textId2_2, false, "b7vj5ks32po5m1z1t1br4o7scdwwy95",
 129                         "BackupDumperTestP2Text2", $this->revId2_1 );
 130                 $this->assertRevision( $this->revId2_3, "BackupDumperTestP2Summary3",
 131                         $this->textId2_3, false, "jfunqmh1ssfb8rs43r19w98k28gg56r",
 132                         "BackupDumperTestP2Text3", $this->revId2_2 );
 133                 $this->assertRevision( $this->revId2_4, "BackupDumperTestP2Summary4 extra",
 134                         $this->textId2_4, false, "6o1ciaxa6pybnqprmungwofc4lv00wv",
 135                         "BackupDumperTestP2Text4 some additional Text", $this->revId2_3 );
 136                 $this->assertPageEnd();
 137
 138                 // Page 3
 139                 // -> Page is marked deleted. Hence not visible
 140
 141                 // Page 4
 142                 $this->assertPageStart( $this->pageId4, NS_TALK, "Talk:BackupDumperTestP1" );
 143                 $this->assertRevision( $this->revId4_1, "Talk BackupDumperTestP1 Summary1",
 144                         $this->textId4_1, false, "nktofwzd0tl192k3zfepmlzxoax1lpe",
 145                         "Talk about BackupDumperTestP1 Text1" );
 146                 $this->assertPageEnd();
 147
 148                 $this->assertDumpEnd();
 149         }
 150
 151         function testPrefetchPlain() {
 152                 // The mapping between ids and text, for the hits of the prefetch mock
 153                 $prefetchMap = array(
 154                         array( $this->pageId1, $this->revId1_1, "Prefetch_________1Text1" ),
 155                         array( $this->pageId2, $this->revId2_3, "Prefetch_________2Text3" )
 156                 );
 157
 158                 // The mock itself
 159                 $prefetchMock = $this->getMock( 'BaseDump', array( 'prefetch' ), array(), '', false );
 160                 $prefetchMock->expects( $this->exactly( 6 ) )
 161                         ->method( 'prefetch' )
 162                         ->will( $this->returnValueMap( $prefetchMap ) );
 163
 164                 // Setting up of the dump
 165                 $nameStub = $this->setUpStub();
 166                 $nameFull = $this->getNewTempFile();
 167                 $dumper = new TextPassDumper( array( "--stub=file:"
 168                         . $nameStub, "--output=file:" . $nameFull ) );
 169                 $dumper->prefetch = $prefetchMock;
 170                 $dumper->reporting = false;
 171                 $dumper->setDb( $this->db );
 172
 173                 // Performing the dump
 174                 $dumper->dump( WikiExporter::FULL, WikiExporter::TEXT );
 175
 176                 // Checking for correctness of the dumped data
 177                 $this->assertDumpStart( $nameFull );
 178
 179                 // Page 1
 180                 $this->assertPageStart( $this->pageId1, NS_MAIN, "BackupDumperTestP1" );
 181                 // Prefetch kicks in. This is still the SHA-1 of the original text,
 182                 // But the actual text (with different SHA-1) comes from prefetch.
 183                 $this->assertRevision( $this->revId1_1, "BackupDumperTestP1Summary1",
 184                         $this->textId1_1, false, "0bolhl6ol7i6x0e7yq91gxgaan39j87",
 185                         "Prefetch_________1Text1" );
 186                 $this->assertPageEnd();
 187
 188                 // Page 2
 189                 $this->assertPageStart( $this->pageId2, NS_MAIN, "BackupDumperTestP2" );
 190                 $this->assertRevision( $this->revId2_1, "BackupDumperTestP2Summary1",
 191                         $this->textId2_1, false, "jprywrymfhysqllua29tj3sc7z39dl2",
 192                         "BackupDumperTestP2Text1" );
 193                 $this->assertRevision( $this->revId2_2, "BackupDumperTestP2Summary2",
 194                         $this->textId2_2, false, "b7vj5ks32po5m1z1t1br4o7scdwwy95",
 195                         "BackupDumperTestP2Text2", $this->revId2_1 );
 196                 // Prefetch kicks in. This is still the SHA-1 of the original text,
 197                 // But the actual text (with different SHA-1) comes from prefetch.
 198                 $this->assertRevision( $this->revId2_3, "BackupDumperTestP2Summary3",
 199                         $this->textId2_3, false, "jfunqmh1ssfb8rs43r19w98k28gg56r",
 200                         "Prefetch_________2Text3", $this->revId2_2 );
 201                 $this->assertRevision( $this->revId2_4, "BackupDumperTestP2Summary4 extra",
 202                         $this->textId2_4, false, "6o1ciaxa6pybnqprmungwofc4lv00wv",
 203                         "BackupDumperTestP2Text4 some additional Text", $this->revId2_3 );
 204                 $this->assertPageEnd();
 205
 206                 // Page 3
 207                 // -> Page is marked deleted. Hence not visible
 208
 209                 // Page 4
 210                 $this->assertPageStart( $this->pageId4, NS_TALK, "Talk:BackupDumperTestP1" );
 211                 $this->assertRevision( $this->revId4_1, "Talk BackupDumperTestP1 Summary1",
 212                         $this->textId4_1, false, "nktofwzd0tl192k3zfepmlzxoax1lpe",
 213                         "Talk about BackupDumperTestP1 Text1" );
 214                 $this->assertPageEnd();
 215
 216                 $this->assertDumpEnd();
 217
 218         }
 219
 220         /**
 221          * Ensures that checkpoint dumps are used and written, by successively increasing the
 222          * stub size and dumping until the duration crosses a threshold.
 223          *
 224          * @param $checkpointFormat string: Either "file" for plain text or "gzip" for gzipped
 225          *                checkpoint files.
 226          */
 227         private function checkpointHelper( $checkpointFormat = "file" ) {
 228                 // Getting temporary names
 229                 $nameStub = $this->getNewTempFile();
 230                 $nameOutputDir = $this->getNewTempDirectory();
 231
 232                 $stderr = fopen( 'php://output', 'a' );
 233                 if ( $stderr === false ) {
 234                         $this->fail( "Could not open stream for stderr" );
 235                 }
 236
 237                 $iterations = 32; // We'll start with that many iterations of revisions in stub
 238                 $lastDuration = 0;
 239                 $minDuration = 2; // We want the dump to take at least this many seconds
 240                 $checkpointAfter = 0.5; // Generate checkpoint after this many seconds
 241
 242
 243                 // Until a dump takes at least $minDuration seconds, perform a dump and check
 244                 // duration. If the dump did not take long enough increase the iteration
 245                 // count, to generate a bigger stub file next time.
 246                 while ( $lastDuration < $minDuration ) {
 247
 248                         // Setting up the dump
 249                         wfRecursiveRemoveDir( $nameOutputDir );
 250                         $this->assertTrue( wfMkdirParents( $nameOutputDir ),
 251                                 "Creating temporary output directory " );
 252                         $this->setUpStub( $nameStub, $iterations );
 253                         $dumper = new TextPassDumper( array( "--stub=file:" . $nameStub,
 254                                 "--output=" . $checkpointFormat . ":" . $nameOutputDir . "/full",
 255                                 "--maxtime=1" /*This is in minutes. Fixup is below*/,
 256                                 "--checkpointfile=checkpoint-%s-%s.xml.gz" ) );
 257                         $dumper->setDb( $this->db );
 258                         $dumper->maxTimeAllowed = $checkpointAfter; // Patching maxTime from 1 minute
 259                         $dumper->stderr = $stderr;
 260
 261                         // The actual dump and taking time
 262                         $ts_before = microtime( true );
 263                         $dumper->dump( WikiExporter::FULL, WikiExporter::TEXT );
 264                         $ts_after = microtime( true );
 265                         $lastDuration = $ts_after - $ts_before;
 266
 267                         // Handling increasing the iteration count for the stubs
 268                         if ( $lastDuration < $minDuration ) {
 269                                 $old_iterations = $iterations;
 270                                 if ( $lastDuration > 0.2 ) {
 271                                         // lastDuration is big enough, to allow an educated guess
 272                                         $factor = ( $minDuration + 0.5 ) / $lastDuration;
 273                                         if ( ( $factor > 1.1 ) && ( $factor < 100 ) ) {
 274                                                 // educated guess is reasonable
 275                                                 $iterations = (int)( $iterations * $factor );
 276                                         }
 277                                 }
 278
 279                                 if ( $old_iterations == $iterations ) {
 280                                         // Heuristics were not applied, so we just *2.
 281                                         $iterations *= 2;
 282                                 }
 283
 284                                 $this->assertLessThan( 50000, $iterations,
 285                                         "Emergency stop against infinitely increasing iteration "
 286                                                 . "count ( last duration: $lastDuration )" );
 287                         }
 288                 }
 289
 290                 // The dump (hopefully) did take long enough to produce more than one
 291                 // checkpoint file.
 292                 //
 293                 // We now check all the checkpoint files for validity.
 294
 295                 $files = scandir( $nameOutputDir );
 296                 $this->assertTrue( asort( $files ), "Sorting files in temporary directory" );
 297                 $fileOpened = false;
 298                 $lookingForPage = 1;
 299                 $checkpointFiles = 0;
 300
 301                 // Each run of the following loop body tries to handle exactly 1 /page/ (not
 302                 // iteration of stub content). $i is only increased after having treated page 4.
 303                 for ( $i = 0; $i < $iterations; ) {
 304
 305                         // 1. Assuring a file is opened and ready. Skipping across header if
 306                         //    necessary.
 307                         if ( !$fileOpened ) {
 308                                 $this->assertNotEmpty( $files, "No more existing dump files, "
 309                                         . "but not yet all pages found" );
 310                                 $fname = array_shift( $files );
 311                                 while ( $fname == "." || $fname == ".." ) {
 312                                         $this->assertNotEmpty( $files, "No more existing dump"
 313                                                 . " files, but not yet all pages found" );
 314                                         $fname = array_shift( $files );
 315                                 }
 316                                 if ( $checkpointFormat == "gzip" ) {
 317                                         $this->gunzip( $nameOutputDir . "/" . $fname );
 318                                 }
 319                                 $this->assertDumpStart( $nameOutputDir . "/" . $fname );
 320                                 $fileOpened = true;
 321                                 $checkpointFiles++;
 322                         }
 323
 324                         // 2. Performing a single page check
 325                         switch ( $lookingForPage ) {
 326                                 case 1:
 327                                         // Page 1
 328                                         $this->assertPageStart( $this->pageId1 + $i * self::$numOfPages, NS_MAIN,
 329                                                 "BackupDumperTestP1" );
 330                                         $this->assertRevision( $this->revId1_1 + $i * self::$numOfRevs, "BackupDumperTestP1Summary1",
 331                                                 $this->textId1_1, false, "0bolhl6ol7i6x0e7yq91gxgaan39j87",
 332                                                 "BackupDumperTestP1Text1" );
 333                                         $this->assertPageEnd();
 334
 335                                         $lookingForPage = 2;
 336                                         break;
 337
 338                                 case 2:
 339                                         // Page 2
 340                                         $this->assertPageStart( $this->pageId2 + $i * self::$numOfPages, NS_MAIN,
 341                                                 "BackupDumperTestP2" );
 342                                         $this->assertRevision( $this->revId2_1 + $i * self::$numOfRevs, "BackupDumperTestP2Summary1",
 343                                                 $this->textId2_1, false, "jprywrymfhysqllua29tj3sc7z39dl2",
 344                                                 "BackupDumperTestP2Text1" );
 345                                         $this->assertRevision( $this->revId2_2 + $i * self::$numOfRevs, "BackupDumperTestP2Summary2",
 346                                                 $this->textId2_2, false, "b7vj5ks32po5m1z1t1br4o7scdwwy95",
 347                                                 "BackupDumperTestP2Text2", $this->revId2_1 + $i * self::$numOfRevs );
 348                                         $this->assertRevision( $this->revId2_3 + $i * self::$numOfRevs, "BackupDumperTestP2Summary3",
 349                                                 $this->textId2_3, false, "jfunqmh1ssfb8rs43r19w98k28gg56r",
 350                                                 "BackupDumperTestP2Text3", $this->revId2_2 + $i * self::$numOfRevs );
 351                                         $this->assertRevision( $this->revId2_4 + $i * self::$numOfRevs,
 352                                                 "BackupDumperTestP2Summary4 extra",
 353                                                 $this->textId2_4, false, "6o1ciaxa6pybnqprmungwofc4lv00wv",
 354                                                 "BackupDumperTestP2Text4 some additional Text",
 355                                                 $this->revId2_3 + $i * self::$numOfRevs );
 356                                         $this->assertPageEnd();
 357
 358                                         $lookingForPage = 4;
 359                                         break;
 360
 361                                 case 4:
 362                                         // Page 4
 363                                         $this->assertPageStart( $this->pageId4 + $i * self::$numOfPages, NS_TALK,
 364                                                 "Talk:BackupDumperTestP1" );
 365                                         $this->assertRevision( $this->revId4_1 + $i * self::$numOfRevs,
 366                                                 "Talk BackupDumperTestP1 Summary1",
 367                                                 $this->textId4_1, false, "nktofwzd0tl192k3zfepmlzxoax1lpe",
 368                                                 "Talk about BackupDumperTestP1 Text1" );
 369                                         $this->assertPageEnd();
 370
 371                                         $lookingForPage = 1;
 372
 373                                         // We dealt with the whole iteration.
 374                                         $i++;
 375                                         break;
 376
 377                                 default:
 378                                         $this->fail( "Bad setting for lookingForPage ($lookingForPage)" );
 379                         }
 380
 381                         // 3. Checking for the end of the current checkpoint file
 382                         if ( $this->xml->nodeType == XMLReader::END_ELEMENT
 383                                 && $this->xml->name == "mediawiki"
 384                         ) {
 385                                 $this->assertDumpEnd();
 386                                 $fileOpened = false;
 387                         }
 388                 }
 389
 390                 // Assuring we completely read all files ...
 391                 $this->assertFalse( $fileOpened, "Currently read file still open?" );
 392                 $this->assertEmpty( $files, "Remaining unchecked files" );
 393
 394                 // ... and have dealt with more than one checkpoint file
 395                 $this->assertGreaterThan( 1, $checkpointFiles, "expected more than 1 checkpoint to have been created. Checkpoint interval is $checkpointAfter seconds, maybe your computer is too fast?" );
 396
 397                 $this->expectETAOutput();
 398         }
 399
 400         /**
 401          * @group large
 402          */
 403         function testCheckpointPlain() {
 404                 $this->checkpointHelper();
 405         }
 406
 407         /**
 408          * tests for working checkpoint generation in gzip format work.
 409          *
 410          * We keep this test in addition to the simpler self::testCheckpointPlain, as there
 411          * were once problems when the used sinks were DumpPipeOutputs.
 412          *
 413          * xmldumps-backup typically uses bzip2 instead of gzip. However, as bzip2 requires
 414          * PHP extensions, we go for gzip instead, which triggers the same relevant code
 415          * paths while still being testable on more systems.
 416          *
 417          * @group large
 418          */
 419         function testCheckpointGzip() {
 420                 $this->checkHasGzip();
 421                 $this->checkpointHelper( "gzip" );
 422         }
 423
 424
 425         /**
 426          * Creates a stub file that is used for testing the text pass of dumps
 427          *
 428          * @param $fname string: (Optional) Absolute name of the file to write
 429          *           the stub into. If this parameter is null, a new temporary
 430          *           file is generated that is automatically removed upon
 431          *           tearDown.
 432          * @param $iterations integer: (Optional) specifies how often the block
 433          *           of 3 pages should go into the stub file. The page and
 434          *           revision id increase further and further, while the text
 435          *           id of the first iteration is reused. The pages and revision
 436          *           of iteration > 1 have no corresponding representation in the
 437          *           database.
 438          * @return string absolute filename of the stub
 439          */
 440         private function setUpStub( $fname = null, $iterations = 1 ) {
 441                 if ( $fname === null ) {
 442                         $fname = $this->getNewTempFile();
 443                 }
 444                 $header = '<mediawiki xmlns="http://www.mediawiki.org/xml/export-0.7/" '
 445                         . 'xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" '
 446                         . 'xsi:schemaLocation="http://www.mediawiki.org/xml/export-0.7/ '
 447                         . 'http://www.mediawiki.org/xml/export-0.7.xsd" version="0.7" xml:lang="en">
 448   <siteinfo>
 449     <sitename>wikisvn</sitename>
 450     <base>http://localhost/wiki-svn/index.php/Main_Page</base>
 451     <generator>MediaWiki 1.21alpha</generator>
 452     <case>first-letter</case>
 453     <namespaces>
 454       <namespace key="-2" case="first-letter">Media</namespace>
 455       <namespace key="-1" case="first-letter">Special</namespace>
 456       <namespace key="0" case="first-letter" />
 457       <namespace key="1" case="first-letter">Talk</namespace>
 458       <namespace key="2" case="first-letter">User</namespace>
 459       <namespace key="3" case="first-letter">User talk</namespace>
 460       <namespace key="4" case="first-letter">Wikisvn</namespace>
 461       <namespace key="5" case="first-letter">Wikisvn talk</namespace>
 462       <namespace key="6" case="first-letter">File</namespace>
 463       <namespace key="7" case="first-letter">File talk</namespace>
 464       <namespace key="8" case="first-letter">MediaWiki</namespace>
 465       <namespace key="9" case="first-letter">MediaWiki talk</namespace>
 466       <namespace key="10" case="first-letter">Template</namespace>
 467       <namespace key="11" case="first-letter">Template talk</namespace>
 468       <namespace key="12" case="first-letter">Help</namespace>
 469       <namespace key="13" case="first-letter">Help talk</namespace>
 470       <namespace key="14" case="first-letter">Category</namespace>
 471       <namespace key="15" case="first-letter">Category talk</namespace>
 472     </namespaces>
 473   </siteinfo>
 474 ';
 475                 $tail = '</mediawiki>
 476 ';
 477
 478                 $content = $header;
 479                 $iterations = intval( $iterations );
 480                 for ( $i = 0; $i < $iterations; $i++ ) {
 481
 482                         $page1 = '  <page>
 483     <title>BackupDumperTestP1</title>
 484     <ns>0</ns>
 485     <id>' . ( $this->pageId1 + $i * self::$numOfPages ) . '</id>
 486     <revision>
 487       <id>' . ( $this->revId1_1 + $i * self::$numOfRevs ) . '</id>
 488       <timestamp>2012-04-01T16:46:05Z</timestamp>
 489       <contributor>
 490         <ip>127.0.0.1</ip>
 491       </contributor>
 492       <comment>BackupDumperTestP1Summary1</comment>
 493       <sha1>0bolhl6ol7i6x0e7yq91gxgaan39j87</sha1>
 494       <model>wikitext</model>
 495       <format>text/x-wiki</format>
 496       <text id="' . $this->textId1_1 . '" bytes="23" />
 497     </revision>
 498   </page>
 499 ';
 500                         $page2 = '  <page>
 501     <title>BackupDumperTestP2</title>
 502     <ns>0</ns>
 503     <id>' . ( $this->pageId2 + $i * self::$numOfPages ) . '</id>
 504     <revision>
 505       <id>' . ( $this->revId2_1 + $i * self::$numOfRevs ) . '</id>
 506       <timestamp>2012-04-01T16:46:05Z</timestamp>
 507       <contributor>
 508         <ip>127.0.0.1</ip>
 509       </contributor>
 510       <comment>BackupDumperTestP2Summary1</comment>
 511       <sha1>jprywrymfhysqllua29tj3sc7z39dl2</sha1>
 512       <model>wikitext</model>
 513       <format>text/x-wiki</format>
 514       <text id="' . $this->textId2_1 . '" bytes="23" />
 515     </revision>
 516     <revision>
 517       <id>' . ( $this->revId2_2 + $i * self::$numOfRevs ) . '</id>
 518       <parentid>' . ( $this->revId2_1 + $i * self::$numOfRevs ) . '</parentid>
 519       <timestamp>2012-04-01T16:46:05Z</timestamp>
 520       <contributor>
 521         <ip>127.0.0.1</ip>
 522       </contributor>
 523       <comment>BackupDumperTestP2Summary2</comment>
 524       <sha1>b7vj5ks32po5m1z1t1br4o7scdwwy95</sha1>
 525       <model>wikitext</model>
 526       <format>text/x-wiki</format>
 527       <text id="' . $this->textId2_2 . '" bytes="23" />
 528     </revision>
 529     <revision>
 530       <id>' . ( $this->revId2_3 + $i * self::$numOfRevs ) . '</id>
 531       <parentid>' . ( $this->revId2_2 + $i * self::$numOfRevs ) . '</parentid>
 532       <timestamp>2012-04-01T16:46:05Z</timestamp>
 533       <contributor>
 534         <ip>127.0.0.1</ip>
 535       </contributor>
 536       <comment>BackupDumperTestP2Summary3</comment>
 537       <sha1>jfunqmh1ssfb8rs43r19w98k28gg56r</sha1>
 538       <model>wikitext</model>
 539       <format>text/x-wiki</format>
 540       <text id="' . $this->textId2_3 . '" bytes="23" />
 541     </revision>
 542     <revision>
 543       <id>' . ( $this->revId2_4 + $i * self::$numOfRevs ) . '</id>
 544       <parentid>' . ( $this->revId2_3 + $i * self::$numOfRevs ) . '</parentid>
 545       <timestamp>2012-04-01T16:46:05Z</timestamp>
 546       <contributor>
 547         <ip>127.0.0.1</ip>
 548       </contributor>
 549       <comment>BackupDumperTestP2Summary4 extra</comment>
 550       <sha1>6o1ciaxa6pybnqprmungwofc4lv00wv</sha1>
 551       <model>wikitext</model>
 552       <format>text/x-wiki</format>
 553       <text id="' . $this->textId2_4 . '" bytes="44" />
 554     </revision>
 555   </page>
 556 ';
 557                         // page 3 not in stub
 558
 559                         $page4 = '  <page>
 560     <title>Talk:BackupDumperTestP1</title>
 561     <ns>1</ns>
 562     <id>' . ( $this->pageId4 + $i * self::$numOfPages ) . '</id>
 563     <revision>
 564       <id>' . ( $this->revId4_1 + $i * self::$numOfRevs ) . '</id>
 565       <timestamp>2012-04-01T16:46:05Z</timestamp>
 566       <contributor>
 567         <ip>127.0.0.1</ip>
 568       </contributor>
 569       <comment>Talk BackupDumperTestP1 Summary1</comment>
 570       <sha1>nktofwzd0tl192k3zfepmlzxoax1lpe</sha1>
 571       <model>wikitext</model>
 572       <format>text/x-wiki</format>
 573       <text id="' . $this->textId4_1 . '" bytes="35" />
 574     </revision>
 575   </page>
 576 ';
 577                         $content .= $page1 . $page2 . $page4;
 578                 }
 579                 $content .= $tail;
 580                 $this->assertEquals( strlen( $content ), file_put_contents(
 581                         $fname, $content ), "Length of prepared stub" );
 582                 return $fname;
 583         }
 584 }