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diff --git a/tests/phpunit/includes/site/FileBasedSiteLookupTest.php b/tests/phpunit/includes/site/FileBasedSiteLookupTest.php
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+++ b/tests/phpunit/includes/site/FileBasedSiteLookupTest.php
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+<?php
+
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @since 1.25
+ *
+ * @ingroup Site
+ * @ingroup Test
+ *
+ * @covers FileBasedSiteLookup
+ * @group Site
+ *
+ * @author Katie Filbert < aude.wiki@gmail.com >
+ */
+class FileBasedSiteLookupTest extends PHPUnit_Framework_TestCase {
+
+	protected function setUp() {
+		$this->cacheFile = $this->getCacheFile();
+	}
+
+	protected function tearDown() {
+		unlink( $this->cacheFile );
+	}
+
+	public function testGetSites() {
+		$sites = $this->getSites();
+		$cacheBuilder = $this->newSitesCacheFileBuilder( $sites );
+		$cacheBuilder->build();
+
+		$cache = new FileBasedSiteLookup( $this->cacheFile );
+		$this->assertEquals( $sites, $cache->getSites() );
+	}
+
+	public function testGetSite() {
+		$sites = $this->getSites();
+		$cacheBuilder = $this->newSitesCacheFileBuilder( $sites );
+		$cacheBuilder->build();
+
+		$cache = new FileBasedSiteLookup( $this->cacheFile );
+
+		$this->assertEquals( $sites->getSite( 'enwiktionary' ), $cache->getSite( 'enwiktionary' ) );
+	}
+
+	private function newSitesCacheFileBuilder( SiteList $sites ) {
+		return new SitesCacheFileBuilder(
+			$this->getSiteLookup( $sites ),
+			$this->cacheFile
+		);
+	}
+
+	private function getSiteLookup( SiteList $sites ) {
+		$siteLookup = $this->getMockBuilder( 'SiteLookup' )
+			->disableOriginalConstructor()
+			->getMock();
+
+		$siteLookup->expects( $this->any() )
+			->method( 'getSites' )
+			->will( $this->returnValue( $sites ) );
+
+		return $siteLookup;
+	}
+
+	private function getSites() {
+		$sites = array();
+
+		$site = new Site();
+		$site->setGlobalId( 'foobar' );
+		$sites[] = $site;
+
+		$site = new MediaWikiSite();
+		$site->setGlobalId( 'enwiktionary' );
+		$site->setGroup( 'wiktionary' );
+		$site->setLanguageCode( 'en' );
+		$site->addNavigationId( 'enwiktionary' );
+		$site->setPath( MediaWikiSite::PATH_PAGE, "https://en.wiktionary.org/wiki/$1" );
+		$site->setPath( MediaWikiSite::PATH_FILE, "https://en.wiktionary.org/w/$1" );
+		$sites[] = $site;
+
+		return new SiteList( $sites );
+	}
+
+	private function getCacheFile() {
+		return tempnam( sys_get_temp_dir(), 'mw-test-sitelist' );
+	}
+
+}