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diff --git a/www/wiki/tests/common/TestSetup.php b/www/wiki/tests/common/TestSetup.php
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+<?php
+
+/**
+ * Common code for test environment initialisation and teardown
+ */
+class TestSetup {
+	/**
+	 * This should be called before Setup.php, e.g. from the finalSetup() method
+	 * of a Maintenance subclass
+	 */
+	public static function applyInitialConfig() {
+		global $wgMainCacheType, $wgMessageCacheType, $wgParserCacheType, $wgMainWANCache;
+		global $wgMainStash;
+		global $wgLanguageConverterCacheType, $wgUseDatabaseMessages;
+		global $wgLocaltimezone, $wgLocalisationCacheConf;
+		global $wgSearchType;
+		global $wgDevelopmentWarnings;
+		global $wgSessionProviders, $wgSessionPbkdf2Iterations;
+		global $wgJobTypeConf;
+		global $wgAuthManagerConfig, $wgAuth;
+
+		// wfWarn should cause tests to fail
+		$wgDevelopmentWarnings = true;
+
+		// Make sure all caches and stashes are either disabled or use
+		// in-process cache only to prevent tests from using any preconfigured
+		// cache meant for the local wiki from outside the test run.
+		// See also MediaWikiTestCase::run() which mocks CACHE_DB and APC.
+
+		// Disabled in DefaultSettings, override local settings
+		$wgMainWANCache =
+		$wgMainCacheType = CACHE_NONE;
+		// Uses CACHE_ANYTHING in DefaultSettings, use hash instead of db
+		$wgMessageCacheType =
+		$wgParserCacheType =
+		$wgSessionCacheType =
+		$wgLanguageConverterCacheType = 'hash';
+		// Uses db-replicated in DefaultSettings
+		$wgMainStash = 'hash';
+		// Use memory job queue
+		$wgJobTypeConf = [
+			'default' => [ 'class' => JobQueueMemory::class, 'order' => 'fifo' ],
+		];
+
+		$wgUseDatabaseMessages = false; # Set for future resets
+
+		// Assume UTC for testing purposes
+		$wgLocaltimezone = 'UTC';
+
+		$wgLocalisationCacheConf['storeClass'] = LCStoreNull::class;
+
+		// Do not bother updating search tables
+		$wgSearchType = SearchEngineDummy::class;
+
+		// Generic MediaWiki\Session\SessionManager configuration for tests
+		// We use CookieSessionProvider because things might be expecting
+		// cookies to show up in a FauxRequest somewhere.
+		$wgSessionProviders = [
+			[
+				'class' => MediaWiki\Session\CookieSessionProvider::class,
+				'args' => [ [
+					'priority' => 30,
+					'callUserSetCookiesHook' => true,
+				] ],
+			],
+		];
+
+		// Single-iteration PBKDF2 session secret derivation, for speed.
+		$wgSessionPbkdf2Iterations = 1;
+
+		// Generic AuthManager configuration for testing
+		$wgAuthManagerConfig = [
+			'preauth' => [],
+			'primaryauth' => [
+				[
+					'class' => MediaWiki\Auth\TemporaryPasswordPrimaryAuthenticationProvider::class,
+					'args' => [ [
+						'authoritative' => false,
+					] ],
+				],
+				[
+					'class' => MediaWiki\Auth\LocalPasswordPrimaryAuthenticationProvider::class,
+					'args' => [ [
+						'authoritative' => true,
+					] ],
+				],
+			],
+			'secondaryauth' => [],
+		];
+		$wgAuth = new MediaWiki\Auth\AuthManagerAuthPlugin();
+
+		// T46192 Do not attempt to send a real e-mail
+		Hooks::clear( 'AlternateUserMailer' );
+		Hooks::register(
+			'AlternateUserMailer',
+			function () {
+				return false;
+			}
+		);
+		// xdebug's default of 100 is too low for MediaWiki
+		ini_set( 'xdebug.max_nesting_level', 1000 );
+
+		// Bug T116683 serialize_precision of 100
+		// may break testing against floating point values
+		// treated with PHP's serialize()
+		ini_set( 'serialize_precision', 17 );
+
+		// TODO: we should call MediaWikiTestCase::prepareServices( new GlobalVarConfig() ) here.
+		// But PHPUnit may not be loaded yet, so we have to wait until just
+		// before PHPUnit_TextUI_Command::main() is executed.
+	}
+
+}