Provide static Factory Class for Math related services

Initially we provide one service. More services will come in
the future.

Change-Id: I98a0f5f181f729e123a063dabf3597b5effa55b8

ServiceWiring.php

@@ -2,6 +2,7 @@
 
 use MediaWiki\Config\ServiceOptions;
 use MediaWiki\Extension\Math\InputCheck\InputCheckFactory;
+use MediaWiki\Extension\Math\Math;
 use MediaWiki\Extension\Math\MathConfig;
 use MediaWiki\Extension\Math\MathWikibaseConfig;
 use MediaWiki\Extension\Math\MathWikibaseConnector;
@@ -33,7 +34,7 @@ return [
 				RendererFactory::CONSTRUCTOR_OPTIONS,
 				$services->getMainConfig()
 			),
-			$services->get( 'Math.Config' ),
+			Math::getMathConfig( $services ),
 			$services->getUserOptionsLookup(),
 			LoggerFactory::getInstance( 'Math' )
 		);

src/Math.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace MediaWiki\Extension\Math;
+
+use MediaWiki\MediaWikiServices;
+use Psr\Container\ContainerInterface;
+
+/**
+ * Top level factory for the Math extension.
+ *
+ * @license GPL-2.0-or-later
+ */
+final class Math {
+
+	/**
+	 * @codeCoverageIgnore
+	 */
+	private function __construct() {
+		// should not be instantiated
+	}
+
+	public static function getMathConfig( ContainerInterface $services = null ): MathConfig {
+		return ( $services ?: MediaWikiServices::getInstance() )
+			->get( 'Math.Config' );
+	}
+
+}

tests/phpunit/integration/MathIntegrationTest.php

@@ -0,0 +1,14 @@
+<?php
+namespace MediaWiki\Extension\Math\Tests;
+
+use MediaWiki\Extension\Math\Math;
+
+/**
+ * @covers \MediaWiki\Extension\Math\Math
+ */
+class MathIntegrationTest extends \MediaWikiIntegrationTestCase {
+	public function testGetMathConfigNull() {
+		$config = Math::getMathConfig();
+		$this->assertInstanceOf( '\MediaWiki\Extension\Math\MathConfig', $config );
+	}
+}

tests/phpunit/unit/MathTest.php

@@ -0,0 +1,32 @@
+<?php
+namespace MediaWiki\Extension\Math\Tests;
+
+use HashConfig;
+use MediaWiki\Config\ServiceOptions;
+use MediaWiki\Extension\Math\Math;
+use MediaWiki\Extension\Math\MathConfig;
+use MediaWiki\MediaWikiServices;
+use MediaWikiUnitTestCase;
+
+/**
+ * @covers \MediaWiki\Extension\Math\Math
+ */
+class MathTest extends MediaWikiUnitTestCase {
+
+	public function testGetMathConfigService() {
+		$config = new HashConfig( [
+			'MathDisableTexFilter' => MathConfig::NEW,
+			'MathValidModes' => [ MathConfig::MODE_SOURCE ]
+		] );
+		$services = new MediaWikiServices( $config );
+		$services->defineService( 'Math.Config',
+			static function ( MediaWikiServices $services ){
+			return new MathConfig(
+					new ServiceOptions( MathConfig::CONSTRUCTOR_OPTIONS, $services->get( 'BootstrapConfig' ) )
+				);
+			}
+		);
+		$mathConfig = Math::getMathConfig( $services );
+		$this->assertStringContainsString( 'new', $mathConfig->texCheckDisabled() );
+	}
+}

tests/phpunit/unit/ServiceWiringTest.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace MediaWiki\Extension\Math\Tests;
+
+use Generator;
+use MediaWikiUnitTestCase;
+
+/**
+ * @coversNothing
+ */
+class ServiceWiringTest extends MediaWikiUnitTestCase {
+	private const EXTENSION_PREFIX = 'Math.';
+
+	/**
+	 * @dataProvider provideWiring
+	 */
+	public function testAllWiringsAreProperlyShaped( $name, $definition ): void {
+		$this->assertStringStartsWith( self::EXTENSION_PREFIX, $name );
+		$this->assertIsCallable( $definition );
+	}
+
+	public function provideWiring(): Generator {
+		$wiring = require __DIR__ . '/../../../ServiceWiring.php';
+
+		foreach ( $wiring as $name => $definition ) {
+			yield $name => [ $name, $definition ];
+		}
+	}
+
+}