mediawiki-extensions-Math/tests/MathDatabaseTest.php

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<?php
/**
* Test the database access and core functionality of MathRenderer.
*
* @group Math
* @group Database //Used by needsDB
*/
class MathDatabaseTest extends MediaWikiTestCase {
/**
* @var MathRenderer
*/
private $renderer;
const SOME_TEX = "a+b";
const SOME_HTML = "a<sub>b</sub> and so on";
const SOME_MATHML = "iℏ∂_tΨ=H^Ψ<mrow><\ci>";
const SOME_CONSERVATIVENESS = 2;
const SOME_OUTPUTHASH = 'C65c884f742c8591808a121a828bc09f8<';
/**
* creates a new database connection and a new math renderer
* TODO: Check if there is a way to get database access without creating
* the connection to the database explicitly
* function addDBData() {
* $this->tablesUsed[] = 'math';
* }
* was not sufficient.
*/
protected function setup() {
parent::setUp();
// TODO: figure out why this is necessary
$this->db = wfGetDB( DB_MASTER );
// Create a new instance of MathSource
$this->renderer = new MathTexvc( self::SOME_TEX );
$this->tablesUsed[] = 'math';
self::setupTestDB( $this->db, "mathtest" );
}
/**
* Checks the tex and hash functions
* @covers MathRenderer::getInputHash()
*/
public function testInputHash() {
$expectedhash = $this->db->encodeBlob( pack( "H32", md5( self::SOME_TEX ) ) );
$this->assertEquals( $expectedhash, $this->renderer->getInputHash() );
}
/**
* Helper function to set the current state of the sample renderer instance to the test values
*/
public function setValues() {
// set some values
$this->renderer->setTex( self::SOME_TEX );
$this->renderer->setMathml( self::SOME_MATHML );
$this->renderer->setHtml( self::SOME_HTML );
$this->renderer->setOutputHash( self::SOME_OUTPUTHASH);
}
/**
* Checks database access. Writes an entry and reads it back.
* @covers MathRenderer::writeDatabaseEntry()
* @covers MathRenderer::readDatabaseEntry()
*/
public function testDBBasics() {
$this->setValues();
$this->renderer->writeToDatabase( $this->db );
$renderer2 = new MathTexvc( self::SOME_TEX );
$this->assertTrue( $renderer2->readFromDatabase(), 'Reading from database failed' );
// comparing the class object does now work due to null values etc.
$this->assertEquals( $this->renderer->getTex(), $renderer2->getTex(), "test if tex is the same" );
$this->assertEquals( $this->renderer->getMathml(), $renderer2->getMathml(), "Check MathML encoding" );
$this->assertEquals( $this->renderer->getHtml(), $renderer2->getHtml(), 'test if HTML is the same' );
}
/**
* Checks the creation of the math table without debugging enabled.
* @covers MathHooks::onLoadExtensionSchemaUpdates
*/
public function testCreateTable() {
$this->setMwGlobals( 'wgMathValidModes', array( MW_MATH_PNG ) );
$this->db->dropTable( "math", __METHOD__ );
$dbu = DatabaseUpdater::newForDB( $this->db );
$dbu->doUpdates( array( "extensions" ) );
$this->expectOutputRegex( '/(.*)Creating math table(.*)/' );
$this->setValues();
$this->renderer->writeToDatabase();
$res = $this->db->select( "math", "*" );
$row = $res->fetchRow();
$this->assertEquals( 10, sizeof( $row ) );
}
/*
* This test checks if no additional write operation
* is performed, if the entry already existed in the database.
*/
public function testNoWrite() {
$this->setValues();
$inputHash = $this->renderer->getInputHash();
$this->assertTrue( $this->renderer->isChanged() );
$this->assertTrue( $this->renderer->writeCache(), "Write new entry" );
$res = $this->db->selectField( "math", "math_inputhash",
array( "math_inputhash" => $inputHash ) );
$this->assertTrue( $res !== false , "Check database entry");
$this->assertTrue( $this->renderer->readFromDatabase() , "Read entry from database");
$this->assertFalse( $this->renderer->isChanged() );
// modify the database entry manually
$this->db->delete( "math", array( "math_inputhash" => $inputHash ) );
// the renderer should not be aware of the modification and should not recreate the entry
$this->assertFalse( $this->renderer->writeCache() );
// as a result no entry can be found in the database.
$this->assertFalse( $this->renderer->readFromDatabase() );
}
}