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+/*!
+ * QUnit tests for ULS.
+ *
+ * Copyright (C) 2012 Alolita Sharma, Amir Aharoni, Arun Ganesh, Brandon Harris,
+ * Niklas Laxström, Pau Giner, Santhosh Thottingal, Siebrand Mazeland and other
+ * contributors. See CREDITS for a list.
+ *
+ * UniversalLanguageSelector is dual licensed GPLv2 or later and MIT. You don't
+ * have to do anything special to choose one license or the other and you don't
+ * have to notify anyone which license you are using. You are free to use
+ * UniversalLanguageSelector in commercial projects as long as the copyright
+ * header is left intact. See files GPL-LICENSE and MIT-LICENSE for details.
+ *
+ * @file
+ * @ingroup Extensions
+ * @licence GNU General Public Licence 2.0 or later
+ * @licence MIT License
+ */
+
+( function () {
+	'use strict';
+
+	QUnit.module( 'ext.uls', QUnit.newMwEnvironment() );
+
+	QUnit.test( 'Initial check', function ( assert ) {
+		assert.ok( $.fn.uls, '$.fn.uls is defined' );
+	} );
+
+	QUnit.test( 'Custom langdb', function ( assert ) {
+		// This is a custom non-standard language code used in MW.
+		// If it's not defined, then, for example,
+		// its direction cannot be acquired using the langdb utils.
+		assert.strictEqual( $.uls.data.getDir( 'als' ), 'ltr', 'The direction of custom MW language als is ltr.' );
+	} );
+
+	QUnit.test( 'User preferences', function ( assert ) {
+		var prefName, prefs, prefsToSave, readPrefs, done;
+
+		// 'gofanim' means "fonts" in Hebrew.
+		// Here it's used as a meaningless word, to test
+		// the preferences without changing anything useful.
+		prefName = 'gofanim';
+		prefs = mw.uls.preferences();
+		prefsToSave = {};
+
+		prefsToSave[ prefName ] = {
+			fonts: {
+				qqy: 'Megafont'
+			}
+		};
+
+		prefs.set( prefName, prefsToSave );
+
+		readPrefs = prefs.get( prefName );
+		assert.strictEqual(
+			readPrefs[ prefName ].fonts.qqy,
+			'Megafont',
+			'Correct value for the font name'
+		);
+
+		done = assert.async();
+		prefs.save( function ( successSave ) {
+			assert.ok( successSave, 'Options saving API did not produce an error.' );
+			// Delete old options
+			prefs.set( prefName, undefined );
+			prefs.save( function () {
+				done();
+			} );
+		} );
+	} );
+
+	QUnit.test( 'Common languages', function ( assert ) {
+		var i, foundTagalog, languagesInPH;
+
+		// Bug 49847
+		foundTagalog = false;
+		languagesInPH = mw.uls.getFrequentLanguageList( 'PH' );
+
+		for ( i = 0; i < languagesInPH.length; i++ ) {
+			if ( $.uls.data.isRedirect( languagesInPH[ i ] ) === 'tl' ||
+				languagesInPH[ i ] === 'tl'
+			) {
+				foundTagalog = true;
+
+				break;
+			}
+		}
+		assert.ok(
+			foundTagalog,
+			'Tagalog is one of the languages presented to users in the Philippines.'
+		);
+	} );
+}() );